The research in brief
Pella is a good, channel-sensitive fit for patio door replacement when the buyer values documented sill, weatherstripping, roller, and frame options and can buy through a Pella showroom or vetted installer. Five of six included platforms named Pella during ranking discovery, and it finished second overall with an average listed rank of 3.0 and a best rank of 1. The strongest reason to consider it is the combination of broad sliding and French door lines with product-specific track, sill, and hardware detail. The main limitation is that installed pricing, lead time, and installation quality are not transparent or uniform across Pella's showroom, retail, and independent-contractor channels.
Research Snapshot
| Field | Finding |
|---|---|
| Platform mentions in ranking stage | 5 of 6 included platforms (DeepSeek, Gemini, Grok, Kimi, ChatGPT) |
| Share of included platform responses | 83.3% |
| Average listed rank | 3.0 |
| Best listed rank | 1 (ChatGPT) |
| Relevant service or product | Pella 250 Series or Impervia sliding patio door via showroom or qualified installer; Reserve or Lifestyle Series for hinged French doors |
| Overall use-case fit | Good, but channel-sensitive |
| Research date | 2026-10-02 |
Why Pella Qualified for This Study
Questions explored
- Why did Pella qualify as a finalist for patio door replacement when track alignment and weather sealing are the priority?
- How many AI platforms named Pella for patio door replacement, and where did it rank?
Pella qualified because it was named by five of the six included platforms during the ranking stage and finished second overall, with an average listed rank of 3.0 and a best rank of 1 (ChatGPT). It was the only entity in this review to receive a first-place listing from any platform.
The qualification rests on product breadth rather than a single door. Platforms repeatedly pointed to Pella's sliding and French patio door lines across vinyl, fiberglass, wood, and clad-wood, plus a manufacturer-backed installation path through Pella showrooms and the Pella Certified Contractor network [14]. Pella also publishes product-specific detail on rollers, tracks, sills, and weatherstripping that maps directly to this study's criteria [24].
Fit ratings were not unanimous. Four platforms rated Pella a good fit (ChatGPT, DeepSeek, Gemini, Kimi) and two rated it mixed (Grok, Perplexity). That split is the central finding of this review, and it is driven by installation and pricing uncertainty rather than by the doors themselves.
The service or product in focus
Questions explored
- Which Pella patio door line should a buyer choose for a sliding replacement where sill height and weather sealing matter?
- Is the Pella 250 Series or Impervia the better fit for a patio door replacement with a low threshold requirement?
The most relevant configuration for this use case is a Pella 250 Series or Impervia sliding patio door purchased through a Pella showroom or qualified installer, with Reserve or Lifestyle Series reserved for higher-end hinged French doors [21].
For buyers whose concern is sticking and leaking, the Impervia fiberglass sliding door carries the most specific published detail. Pella describes a low-profile sill advertised as 45% lower than an average sill, adjustable permanently sealed ball-bearing rollers on a stainless-steel track, flexible polymeric bulb weatherstripping with welded corners, and a bristle-strip rainscreen [24]. The 250 Series vinyl sliding door is described with reinforced panels, perimeter fin-type pile weatherstripping, multipoint locking, and a sloped weeping system on the three-panel configuration intended to direct water away from the interior [19].
Encompass by Pella is the budget-oriented vinyl line. It is described with adjustable ball-bearing rollers on a stainless steel track cap, a single-point locking system with an interior thumblock, optional exterior keylock, and performance ratings listed as R35–R50 with STC 25 [21]. Kimi noted that a double-point locking mechanism was not found on Encompass, while competitor Pease Doors lists one at a lower price [5].
Higher-end lines appear in the platform outputs under several names. Lifestyle Series wood sliding doors are described as custom-made and requiring a Pella expert consultation, with online price examples shown [23]. Architect Series components are described as including weatherstrips, roller assemblies, and track caps [29]. Sliding French doors are available in the 250 Series and Encompass lines, while Reserve and Lifestyle are the relevant lines for higher-end hinged French doors [13].
What the AI Platforms Agreed About
Questions explored
- What do AI platforms agree Pella does well for patio door replacement?
- Does Pella publish enough track, sill, and weatherstripping detail to judge a patio door replacement?
Platforms agreed on product breadth. Every platform that named Pella described a range spanning vinyl, fiberglass, wood, and clad-wood, with both sliding and French configurations [14].
Platforms also agreed that Pella publishes more product-level hardware and sealing detail than most of the comparison set. Adjustable rollers, track caps, weatherstripping types, and sill geometry appear across Pella's own product and technical pages [24]. Google described the Impervia fiberglass material as resisting climate temperature swings to prevent warping, with tight weatherstripping and insulating glass seals [9].
A third area of agreement is that installation determines the outcome. Pella's own installation instructions require a continuous bead of sealant across the inner sill and subfloor to prevent water leaks [7]. Pella states that installation instructions are part of the warranty terms and that failure to comply can void coverage, and that the opening must be plumb and level [3]. Independent guidance likewise states that Pella strongly recommends its certified professional network to protect the warranty and ensure correct operation [32].
Platforms agreed on the warranty structure at a high level: product warranties cover labor for the first two years, and the Pella Care Guarantee is limited to replacement customers who purchase and install through local Pella showrooms [26]. Pella's vinyl limited lifetime warranty covers labor costs only within the first two years of the sale date [8].
Where the AI Platforms Disagreed or Were Uncertain
Questions explored
- Why did some AI platforms rate Pella as only a mixed fit for patio door replacement?
- Is Pella's threshold and track engineering for patio doors independently verified?
Fit ratings split. Grok rated Pella mixed, citing mixed customer reports on sealing performance and service variability, and stated that independent long-term field data on threshold and track longevity for this use case is limited in public sources [36]. Perplexity also rated it mixed, citing the absence of fully transparent installed pricing and no independently verified install consistency [25].
Threshold specificity is contested. Kimi stated that Pella's threshold and track detail is insufficient to confirm superiority for leak prevention, and that competitor Pease Doors provides more explicit sill geometry, including an aluminum 9-degree sloped sill [5]. Kimi also could not verify whether Pella Encompass doors meet Florida Building Code or Texas TDI certification, while Pease Doors explicitly lists both [5].
Customer review strength is unresolved. Pella product pages show approximately 4.28/5 for Impervia and 4.29/5 for the 250 Series on the reviewed pages [19]. Lowe's and consumer-complaint sources contain reports of damaged products, service disputes, and installation problems, which are anecdotal and not representative of all installations [38]. Trustpilot reviews include complaints about leaks, service delays, and weatherstripping failures [39]. A forum thread documents a threshold defect and weatherstrip issue [36]. Perplexity found no independent, patio-door-specific 2026 customer-review dataset in its retrieved sources [25].
Pricing transparency is a shared limitation rather than a disagreement. Pella does not publish list prices for installed patio doors; costs come through showroom or in-home consultation [12]. Some online product prices are published, but installed totals are not [25].
Features for this home improvement need
Questions explored
- Does Pella's adjustable roller and track system help with a patio door that sticks?
- What energy performance ratings should a buyer verify on a Pella patio door replacement?
Track and threshold. Impervia uses adjustable permanently sealed ball-bearing rollers on a stainless-steel track and a low-profile sill advertised as 45% lower than an average sill [24]. The 250 Series three-panel door includes a sloped weeping system [20]. Architect Series components include roller assemblies and track caps [29]. Pella door rollers are described as adjustable and permanently sealed [33]. Kimi noted that Encompass rollers are adjustable ball-bearing units on a stainless steel track cap, supporting field correction of alignment [21].
Weather sealing. Impervia documentation identifies flexible polymeric bulb weatherstripping with welded corners and a bristle-strip rainscreen [24]. The 250 Series uses perimeter fin-type pile weatherstripping [19]. Encompass is described with tight weather sealing and performance ratings of R35–R50 with STC 25 [21]. Grok reported water penetration resistance ratings in the range of 4.5–7.5 psf for Impervia [24]. Encompass performance data lists air infiltration as low as 0.18 cfm/ft² with AAMA/WDMA certification [2].
Energy performance. Available options include Low-E insulating glass, argon, and triple-pane configurations on applicable products [19]. Encompass offers optional Low-E glass coatings for climate-specific efficiency and 3/4-inch or 1-inch tempered sealed insulating glass with Blinds-Between-the-Glass [21]. Product-specific U-factor, SHGC, air leakage, water resistance, and ENERGY STAR qualification must be checked on the exact size, glass package, and configuration because ratings vary by selection [1].
Hardware. Encompass includes a single-point locking system, interior thumblock, optional exterior keylock, and standard hardware colors in White, Fossil, and Almond, with optional decorative finishes [21]. The 250 Series includes multipoint locking [19].
Pricing, contracts, and ongoing costs
Questions explored
- How much does a Pella patio door replacement cost, and is the online price installed or product-only?
- What fees and warranty limits should a buyer confirm before signing a Pella patio door contract?
Installed pricing is quote-based and location-specific, and the exact installed cost cannot be verified from the reviewed public sources [12]. Pricing confidence was rated low by ChatGPT, DeepSeek, Grok, and Kimi, and moderate by Perplexity and Gemini.
Published product-only figures vary by platform and date. Perplexity reported a Lifestyle Series 4-panel sliding patio door online price of $3,510.63, an Impervia fiberglass 2-panel sliding door at $3,126.98, and Encompass by Pella vinyl sliding doors at $1,457.94 and $1,131.30, with some 250 Series entries showing $0.00, indicating quote-based or unavailable online pricing [25]. Google reported a Lifestyle Series Wood 2-panel sliding door starting from $4,658.20 in materials only [10]. Google also cited an independent comparison stating an installed Pella 250 Series sliding patio door in mid-range markets ranges from $1,600 to $2,400 [31]. These figures come from different platforms, dates, and scopes and should not be treated as a single price list.
Additional costs. Online orders are product-only and exclude installation [21]. Potential costs include removal, disposal, trim, reframing, sill repair, flashing or pan work, interior or exterior finish repair, permits, and structural changes, with exact applicability unclear (ChatGPT). Permit fees may apply depending on local jurisdiction, custom sizing or finishes may incur extra charges, and trip or consultation fees may be charged in some markets (DeepSeek). Upgrade charges for premium glass, triple-pane glass, upgraded hardware, screens, finishes, blinds, larger configurations, or special installation conditions may apply, with exact amounts unclear (ChatGPT). Google cited standard installation labor typically adding $100 to $250 per unit, increasing with custom trim or large multi-panel configurations (Gemini).
Contract and cancellation terms. Exact deposit, cancellation, change-order, measurement-error, delivery, and rescheduling terms were not verified from the reviewed public sources (ChatGPT). Cancellation and refund policies are not standardized publicly (DeepSeek). Kimi reported that undamaged made-to-order products cannot be returned for incorrect size, color, or change of mind, with full refund or replacement only for damaged shipping or incorrect product fulfillment [21]. Pella states that online orders arrive product-only and installation is separate unless arranged through a Pella Certified Contractor or showroom path [26].
Warranty limits. Product warranties cover labor for the first two years [26]. Pella frame weatherstripping carries a 10-year limited warranty, with labor covered only within the first two years [6]. Limited lifetime coverage applies to original purchasers in owner-occupied single-family residences [16]. The Pella Care Guarantee is available exclusively for replacement customers purchasing and installing through local Pella showrooms and is not available through Lowe's, Pella Certified Contractors, Pella Select Contractors, or independent contractors [26]. Kimi could not find the labor warranty duration for Pella installations in its retrieved results [21].
Lead time. Pella describes the relevant doors as custom or made to order. For online product orders, Pella states that pickup or delivery scheduling may take approximately 2 to 14 weeks depending on production timing and delivery method [19]. Showroom installation timing is unclear and must be quoted locally (ChatGPT). Deepseek reported lead times ranging from weeks to several months with no publicly guaranteed fixed lead time [12].
Best Suited For
Questions explored
- Who is Pella best suited for in a patio door replacement?
- Is Pella a good choice for a buyer who wants documented sill and weatherstripping detail?
Pella is best suited to homeowners replacing a sliding door where sill height, weather resistance, adjustable rollers, and frame material are important (ChatGPT). It fits buyers who want vinyl, fiberglass, wood, clad-wood, French, multi-panel, and multiple glass-performance options from one manufacturer [14].
It also fits projects using a local Pella showroom with a written installation scope and the Pella Care Guarantee, because that channel carries the strongest stated service coverage [26]. Buyers who want published online starting prices for some patio door SKUs and a manufacturer-backed warranty path are also a reasonable match [25].
Buyers willing to wait 2 to 14 weeks for made-to-order production and who want between-the-glass blinds or grilles for easier cleaning are a further fit [21]. Homeowners in high-exposure climates requiring advanced weatherstripping and certified installer coverage were named by Gemini as a good match [9].
Probably Not Best Suited For
Questions explored
- Who should not choose Pella for patio door replacement?
- Is Pella a poor fit for a buyer who needs upfront installed pricing before a consultation?
Pella is probably not the best fit for buyers seeking a published, all-in installed price before an in-home consultation [12]. It is also a weaker fit for buyers relying on a retail or independent installation channel but expecting the same service coverage as a Pella showroom installation, because the Pella Care Guarantee does not extend to those channels [26].
Buyers in areas with no Pella-owned store and weak certified installer coverage are a poor match (DeepSeek). So are buyers who prioritize independent, user-generated review strength over brand reputation, given mixed independent ratings [35].
Budget-focused buyers needing transparent upfront pricing, and buyers who need immediate availability in stock sizes, are also poorly served, since the relevant doors are made to order [21]. DIY installers are a weak fit because subtle threshold misalignment can compromise track performance and void warranties [32]. Buyers in Florida or Texas TDI regions needing specific anchoring certifications should note that Kimi could not verify Pella compliance in its search results [5].
When Another Option May Be Better
Questions explored
- What is a better alternative to Pella for a patio door replacement when local workmanship matters more than brand breadth?
- When should a buyer choose a local installer or another manufacturer over Pella for patio doors?
Another option may be better when independently verified local workmanship, sill-pan detailing, and service responsiveness outweigh national brand breadth (ChatGPT). Buyers who want multiple competing installed bids with clearer scope and warranty differences should compare Andersen, ProVia, Marvin, JELD-WEN, and regional specialists (ChatGPT).
A local window and door company that provides detailed upfront quotes may be better when published pricing is the priority (DeepSeek). A highly reviewed independent installer may be better when top-rated installation workmanship is the priority (DeepSeek). A regional company may offer more direct accountability in markets without a Pella-owned store or strong certified installer network (DeepSeek).
A hinged French-door specialist may be better when the opening suits hinged operation or the buyer wants to eliminate sliding-track alignment and roller issues, though hinged doors introduce different threshold, sill, astragal, multipoint-lock, and weather-seal installation requirements [13]. Kimi listed alternatives with more explicit threshold engineering, double-point locking, verified Florida Product Approval or TDI Texas compliance, and a stated two-year labor warranty from Stanek [5]. Buyers seeking a lifetime guarantee on both labor and materials may need a local independent contractor who provides a workmanship guarantee (Gemini).
Questions to ask before choosing a provider
Questions explored
- What should a buyer confirm with Pella before signing a patio door replacement contract?
- Which warranty, installer, and threshold details must be in writing before a Pella patio door installation?
Who exactly will install the door: Pella employees, a Pella showroom crew, a Pella Certified Contractor, a Pella Select Contractor, Lowe's, or another independent contractor (ChatGPT). Whether the quote includes removal, disposal, sill-pan or flashing work, shimming, leveling, insulation, exterior water-management detailing, trim, and interior finish repair [3].
The exact product line, model, size, panel configuration, frame material, glass package, U-factor, SHGC, air-leakage rating, water-resistance rating, and performance grade [1]. How the installer will verify opening squareness, sill level, track alignment, roller adjustment, lock engagement, and weather-seal compression at completion [7].
Whether the purchase qualifies for the Pella Care Guarantee and what labor and service coverage applies to this exact sales and installation channel [26]. The deposit, cancellation, change-order, delivery, damage-claim, and delay terms (ChatGPT, DeepSeek). The committed production, delivery, and installation schedule for the exact ZIP code and configuration [21].
Recent local references for patio-door replacements involving leak prevention and difficult threshold conditions [24]. The total installed price for equivalent Pella, Andersen, ProVia, Marvin, or regional alternatives (ChatGPT). Whether the specific model is Florida Product Approved or TDI Texas compliant for the installation address [5]. Whether the local installer offers a workmanship warranty beyond Pella's two-year manufacturer labor limit (Gemini).
The consensus assessment
Pella is a good, but channel-sensitive, fit for patio door replacement. Five of six included platforms named it during ranking discovery, it finished second overall, and four of six rated the fit good while two rated it mixed. Its strongest case is a showroom-managed installation of a 250 Series or Impervia sliding door where documented sill, weather-sealing, hardware, and frame options matter [24].
The buyer should not treat the Pella brand or contractor certification alone as proof of correct threshold detailing or leak-free installation. Pella's own instructions tie warranty coverage to compliant installation, and the Pella Care Guarantee is limited to showroom purchase-and-install replacement work [3]. The written installation scope, exact warranty channel, local installer record, and total installed quote are decisive. Buyers comparing this option against others in the patio door replacement consensus index should weigh the same factors across every bid.
How This Review Was Produced
This review evaluates Pella only for patio door replacement. It is not a broad company review. It draws on platform fit-research responses from six included platforms: ChatGPT, DeepSeek, Grok, Kimi, Perplexity, and Gemini. The authoritative run research date is 2026-10-02.
Platform mentions in the ranking stage count only platforms that named the entity during ranking discovery. All included platforms evaluated fit, but not all named Pella in the ranking stage. Company-owned citations materially outnumber independent citations in the supplied evidence, so company claims are not described here as independently verified. Citations are platform-reported evidence, not independently verified facts. No-search model claims require explicit verification before being described as current facts.
This report sits within the broader window and door replacement category directory.
Research limitations
Platform-reported research dates differ from the authoritative run date. Deepseek reported a research date of 2026-01-15, while Gemini, Grok, Kimi, ChatGPT, and Perplexity reported 2026-10-02. Platform-reported dates are provenance metadata and do not independently prove freshness.
The supplied URLs were collected from platform responses and were not independently validated by the writer stage. Official-site retrieval failed for the Pella homepage because the HTML exceeded the size limit, so no official-page excerpt was used as a verified fact. The deterministic identity audit used an exact-name fallback, and the matching reported domain was retained for downstream research but remains unverified. Local Pella entity ownership and showroom availability must be verified by ZIP code.
The supplied recommended-product list combines current and possibly overlapping Pella product names, and exact availability varies by geography and channel. Pella's public materials describe certification and warranty programs but do not independently verify installation quality for every local installer. Review results vary by product page, retailer, and review methodology, and some retailer reviews are identified as incentivized or AI-summarized. No reliable national installed-price database or uniform lead-time commitment was found. Product performance specifications vary by size, glass, configuration, and installation method. Conflicting product names, pricing, and capabilities were not resolved by guessing; they are described as conflicts with verification steps for buyers.
Sources
Company-Owned Sources
- Pella Architectural Design Manual: Encompass Sliding Door: https://media.pella.com/professional/adm/Encompass_SlidingDoor.pdf
- Encompass Sliding Door performance data: https://media.pella.com/professional/adm/Vinyl/Encompass_SlidingDoor.pdf
- Hinged Patio Door Installation Instructions: https://media.pella.com/professional/installation/GIF-000002948-_V989418.pdf
- IMPORTANT SAFETY AND PRODUCT INFORMATION − DOORS: https://media.pella.com/professional/installation/PR_FFSW-SPD_25.pdf
- 2 Panel Sliding White Patio Door (Low-E Clear Glass) – Pease Doors: The Door Store: https://peasedoors.com/products/6-sliding-clear-glass-white-patio-double-door
- Pella Fiberglass or Steel Entry Door Systems Product Warranty: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGAqUOJUcssEPR-WTaRwPd20k1dbdg8S2kA4rsdAQaExTJnX23fuh3btKrb68F3lwftNM9uomZUqpaRwBrsJRROZaV8Unar7PWKJTofHCogyMOBFAbEMUI-Qgk9qCbTvIXn3XsrV04qTkRuTJ5WaRs3jmn8x54z_GZgQ3mH4KyOudntPF0a364u9Hit_A0=
- Pella Vinyl Window & Patio Door Limited Warranty: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGEyaT0F9m97-mzG2p4kI5FiXsAuGG07TEjOHxw6qYiNLihWEGsW21CjPW2t7ts7y8wfIhN2sZlvcMHVmOXEFigqaH8L9cM5COy1l4BBE5-E7b0ZjL5E3XwZOMxs8h37HswxwNJFV0LMeOa1obrozd6UfJrlS0AT-uOnCl6_v555fEGu5_lo0FPQA6fBTvzgiqTSeV2ejU3rQY0zVbyPCTRMa4Z29oR5iGS8rEhUKrJ79O5qr1UaIj8gBYuuVuxbaSt-cbnQWydQCmWh61NZNQrMccdTgj7aH3r6R0VkWFcEPYzbaeyggdxTTn_1_hlmnjMGhc8LnakuVf50GhQZZjutyp7
- Patio Door Replacement Costs | Infinity by Marvin: https://www.infinitywindows.com/blog/patio-door-replacement-costs
- Pella Patio Doors: https://www.pella.com/doors/patio-doors/
- Exterior French Door Buying Guide: https://www.pella.com/ideas/doors/patio-doors/french-door-buying-guide/
- Replacement Patio Doors: https://www.pella.com/ideas/doors/patio-doors/replacement/
- Things to Know About Patio Door Installation: https://www.pella.com/ideas/doors/patio-doors/replacement/patio-door-installation-what-to-expect/
- All Frequently Asked Questions: https://www.pella.com/ideas/faq/
- Become a Pella Certified Contractor: https://www.pella.com/professionals/contractor/loyalty-program/
- Shop All Patio Doors | Pella: https://www.pella.com/shop/doors/patio-doors/
- Shop 250 Series Vinyl Sliding Patio Doors: https://www.pella.com/shop/doors/patio-doors/250-series/sliding-patio-doors/
- Shop 250 Series 3-Panel Vinyl Sliding Patio Doors: https://www.pella.com/shop/doors/patio-doors/250-series/three-panel-sliding-patio-doors/
- Buy Encompass Vinyl Sliding Patio Doors Online | Pella: https://www.pella.com/shop/doors/patio-doors/encompass/sliding-patio-doors/
- Buy Lifestyle Series 4-Panel Sliding Patio Doors Online: https://www.pella.com/shop/doors/patio-doors/lifestyle-series/four-panel-sliding-patio-doors/
- Buy Lifestyle Series Wood Sliding Patio Doors Online: https://www.pella.com/shop/doors/patio-doors/lifestyle-series/sliding-patio-doors/
- Shop Impervia Fiberglass Sliding Patio Doors Online: https://www.pella.com/shop/doors/patio-doors/pella-impervia/sliding-patio-doors/
- Shop Sliding Patio Doors: https://www.pella.com/shop/doors/patio-doors/sliding/
- Window and Door Warranties: https://www.pella.com/support/warranties/
- Find a Local Pella Certified Contractor: https://www.pella.com/where-to-buy/find-a-contractor/
- Sliding Patio Door Replacement | Stanek Custom Patio Doors: https://www.stanekwindows.com/patio-doors.aspx
Independent Sources
- Pella patio door threshold defect - Community Forums: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQErFhnuMn01IVeCzFNMs8p1l0kiSaO4a0aGlK05SlC_weU6dLlD8AY0Be1RD8eDu1K61lZawDPpZMgEUC8cHxHvbVeUW4xkm3V-o_0vPLqnXVkoQUrFiWMebg-u0Uu-ZvDNMR8r9wbEfGsMW8ksylle923BT2JdVJaAaEP-wHvqpPzJ4CpaVscCvLV3Sxygm4zabq-h_7QujdPcp8TF
- Pella Windows and Doors Reviews: https://www.bbb.org/us/ia/pella/profile/windows/pella-corporation-0664-1186
- Pella patio door threshold defect: https://www.doityourself.com/forum/doors-skylights-windows/639844-pella-patio-door-threshold-defect.html
- Pella Lifestyle Series 72-in x 80-in x 4-9/16-in Jamb: https://www.lowes.com/pd/Pella-Lifestyle-Series-72-in-x-80-in-x-4-9-16-in-Jamb-Low-E-argon-Clear-glass-White-Clad-wood-Right-hand-Sliding-Patio-Door/5016131759
- Ratings & Reviews for Pella Patio Doors: https://www.lowes.com/reviews/pella-1000008974-patio-doors/5015069449
- Pella Reviews: https://www.trustpilot.com/review/www.pella.com
ChatGPT
Claude
DeepSeek
Grok
Perplexity
Kimi
Gemini