Longest context window LLMs
GPT-6.1 Terra ties for the largest context window of the recent, generally available models in our data: 1,050,000 tokens. Lowest price with a 1M+ token window: Mercury 3. Highest max output: DeepSeek-V4.1-Flash-1017. Open weights with a long window: GLM-5.3. A listed window is a limit, not a measure of how well a model uses it.
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Pick by what limits you
Largest published context window
1,050,000 tokens, tied with 6 other models here (newest shown); $1 in / $5 out per 1M tokens. Source
Lowest price with a 1M+ token window
1M tokens at $0.1 in / $0.35 out per 1M tokens (temporary price). Source
Highest max output
Up to 384,000 output tokens with a 1M-token window. Source
Each pick follows one stated rule over our sourced data, so it moves when the data does. This is a way to choose, not a quality ranking: we have not run these models.
All models in scope (31)
Language models in our data released in the 120 days before Oct 29, 2026 with a published context window of at least 400K tokens. Largest first. Our data is not every model on the market.
| Model | Context | Price (listed) | Licence | Released | Status |
|---|---|---|---|---|---|
| GPT-6.1 TerraOpenAI | 1.05M tokenssource | $1 in / $5 out per 1M tokenssource | Proprietary (API)source | Oct 26, 2026source | Generally available |
| GPT-6.1 SolOpenAI | 1.05M tokenssource | $2 in / $10 out per 1M tokenssource | Proprietary (API)source | Sep 29, 2026source | Generally available |
| GPT-6 LunaOpenAI | 1.05M tokenssource | $0.1 in / $0.5 out per 1M tokenssource | Proprietary (API)source | Sep 22, 2026source | Generally available |
| GPT-6 AstraOpenAI | 1.05M tokenssource | $10 in / $50 out per 1M tokenssource | Proprietary (API)source | Sep 3, 2026source | Generally available |
| GPT-5.6 LunaOpenAI | 1.05M tokenssource | $0.2 in / $1.2 out per 1M tokenssource | Proprietary (API)source | Jul 9, 2026source | Generally available |
| GPT-5.6 SolOpenAI | 1.05M tokenssource | $4 in / $20 out per 1M tokens (promotional price, OpenAI says it is available at least through Nov 21, 2026; list price after the promo not stated)source | Proprietary (API)source | Jul 9, 2026source | Generally available |
| GPT-5.6 TerraOpenAI | 1.05M tokenssource | $2 in / $12 out per 1M tokenssource | Proprietary (API)source | Jul 9, 2026source | Generally available |
| Kimi K3.1 ProMoonshot AI | 1.05M tokenssource | $2 in / $10 out per 1M tokenssource | Not yet publishedsource | Oct 23, 2026source | Generally available |
| Kimi K3.1 Pro HighspeedMoonshot AI | 1.05M tokenssource | $4 in / $20 out per 1M tokenssource | Not published | Oct 23, 2026source | Generally available |
| Gemini 4 ArgonGoogle | 1.05M tokenssource | $2 in / $10 out per 1M tokens (introductory price until Nov 30, 2026; list $4 / $20)source | Proprietary (API)source | Oct 13, 2026source | Generally available |
| Muse WonderMeta | 1.05M tokenssource | $4 in / $20 out per 1M tokenssource | Proprietary (API)source | Oct 12, 2026source | Public preview |
| Gemini 3.8 FlashGoogle | 1.05M tokenssource | $0.75 in / $3.75 out per 1M tokens (temporary price until Dec 31, 2026; list $1.5 / $7.5)source | Proprietary (API)source | Sep 2, 2026source | Generally available |
| GLM-5.3Z.ai | 1.05M tokenssource | $1.4 in / $4.4 out per 1M tokenssource | GLM-5.3 License (MIT-style plus a MaaS condition)source | Aug 14, 2026source | Generally available |
| Gemini 3.5 Flash-LiteGoogle | 1.05M tokenssource | Not published | Proprietary (API)source | Jul 21, 2026source | Generally available |
| Gemini 3.6 FlashGoogle | 1.05M tokenssource | Not published | Proprietary (API)source | Jul 21, 2026source | Generally available |
| Mercury 3Inception | 1M tokenssource | $0.1 in / $0.35 out per 1M tokens (launch promo, end date not stated; list $0.2 / $0.7)source | Proprietary (API)source | Oct 19, 2026source | Generally available |
| MiniMax M3.1 FlashMiniMax | 1M tokenssource | $0.15 in / $0.6 out per 1M tokenssource | MiniMax Community Licensesource | Oct 19, 2026source | Generally available |
| DeepSeek-V4.1-Flash-1017DeepSeek | 1M tokenssource | ¥1 in / ¥4 out per 1M tokens; peak: ¥2 / ¥8source | MITsource | Oct 17, 2026source | Generally available |
| Muse Spark OpenMeta | 1M tokenssource | Not published | Muse Model License (limited commercial terms)source | Oct 15, 2026source | Generally available |
| Claude Haiku 5.5Anthropic | 1M tokenssource | $0.1 in / $0.5 out per 1M tokenssource | Proprietary (API)source | Oct 7, 2026source | Generally available |
| Mistral Large 4Mistral AI | 1M tokenssource | $1.36 in / $4.18 out per 1M tokenssource | Mistral Ecosystem Open-Weight License (MIT derivative with limits on model-as-a-service)source | Oct 6, 2026source | Public preview |
| Claude Sonnet 5.5Anthropic | 1M tokenssource | $2 in / $10 out per 1M tokenssource | Proprietary (API)source | Sep 28, 2026source | Generally available |
| Claude Opus 5.5Anthropic | 1M tokenssource | $4 in / $20 out per 1M tokenssource | Proprietary (API)source | Sep 22, 2026source | Generally available |
| Claude Fable 5.1Anthropic | 1M tokenssource | $10 in / $50 out per 1M tokenssource | Proprietary (API)source | Sep 15, 2026source | Generally available |
| DeepSeek-V4.1-FlashDeepSeek | 1M tokenssource | ¥1 in / ¥4 out per 1M tokens; peak: ¥2 / ¥8source | MITsource | Sep 10, 2026source | Generally available |
| Claude Mythos 5.1Anthropic | 1M tokenssource | $10 in / $50 out per 1M tokenssource | Proprietary (API)source | Sep 1, 2026source | Limited access |
| Claude Opus 5Anthropic | 1M tokenssource | $5 in / $25 out per 1M tokenssource | Proprietary (API)source | Jul 24, 2026source | Generally available |
| Kimi K3Moonshot AI | 1M tokenssource | $3 in / $15 out per 1M tokenssource | Kimi K3 License (custom)source | Jul 16, 2026source | Generally available |
| Grok 4.7xAI | 500K tokenssource | $2 in / $6 out per 1M tokenssource | Proprietary (API)source | Sep 21, 2026source | Generally available |
| Grok 4.6xAI | 500K tokenssource | $2 in / $6 out per 1M tokenssource | Proprietary (API)source | Aug 12, 2026source | Generally available |
| Grok 4.5xAI | 500K tokenssource | $2 in / $6 out per 1M tokenssource | Proprietary (API)source | Jul 8, 2026source | Generally available |
FAQ
Which LLM has the largest context window?
GPT-6.1 Terra, at 1,050,000 tokens, among recent, generally available models in our data. Others list the same figure; see the table.
Does a bigger context window mean better long-document answers?
Not by itself. The window is the most a model accepts; how well it finds and uses information deep in a long input varies. We have not measured that.
What is the cheapest model with a 1M-token window?
Mercury 3: $0.1 in / $0.35 out per 1M tokens (temporary price). Some vendors charge more above a size threshold; check the linked pricing page.
Did you test these context windows?
No. Context windows are Reported from the vendors' model pages.
Related
Latest news briefs on these models
- OpenAI GPT-6.1 Terra: a $1/$5 computer-use model, and what the launch post leaves out (Reported; first seen 2026-10-26 19:05 UTC)
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