AI models with the largest context window
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Data updated on October 14, 2026· 221 models
The 25 chat models with the largest context window by API, from largest to smallest. Only models released in the last 12 months. Data as of 10/14/2026.
| # | Model | Provider | Input $/1M | Output $/1M | Context | Capabilities | Released |
|---|---|---|---|---|---|---|---|
| 1 | Grok 4.20 Multi-Agent | xAI | $1.25 | $2.50 | 2 M | 03/31/2026 | |
| 2 | Grok 4.20 | xAI | $1.25 | $2.50 | 2 M | 03/31/2026 | |
| 3 | GPT-6 Luna Pro | OpenAI | $0.100 | $0.500 | 1.1 M | 09/22/2026 | |
| 4 | GPT-6 Luna | OpenAI | $0.100 | $0.500 | 1.1 M | 09/22/2026 | |
| 5 | GPT-5.6 Luna | OpenAI | $0.200 | $1.20 | 1.1 M | 07/09/2026 | |
| 6 | GPT-5.6 Luna Pro | OpenAI | $0.200 | $1.20 | 1.1 M | 07/09/2026 | |
| 7 | GPT-6.1 Sol Pro | OpenAI | $2.00 | $10.00 | 1.1 M | 09/29/2026 | |
| 8 | GPT-6.1 Sol | OpenAI | $2.00 | $10.00 | 1.1 M | 09/29/2026 | |
| 9 | GPT-6 Sol | OpenAI | $2.00 | $10.00 | 1.1 M | 09/22/2026 | |
| 10 | GPT-6 Sol Pro | OpenAI | $2.00 | $10.00 | 1.1 M | 09/22/2026 | |
| 11 | GPT-5.6 Terra | OpenAI | $2.00 | $12.00 | 1.1 M | 07/09/2026 | |
| 12 | GPT-5.6 Sol Pro | OpenAI | $2.00 | $10.00 | 1.1 M | 07/09/2026 | |
| 13 | GPT-5.6 Sol | OpenAI | $2.00 | $10.00 | 1.1 M | 07/09/2026 | |
| 14 | GPT-5.6 Terra Pro | OpenAI | $2.00 | $12.00 | 1.1 M | 07/09/2026 | |
| 15 | GPT-5.4 | OpenAI | $2.50 | $15.00 | 1.1 M | 03/05/2026 | |
| 16 | GPT-5.5 | OpenAI | $5.00 | $30.00 | 1.1 M | 04/23/2026 | |
| 17 | GPT-6 Astra Pro | OpenAI | $10.00 | $50.00 | 1.1 M | 09/04/2026 | |
| 18 | GPT-6 Astra | OpenAI | $10.00 | $50.00 | 1.1 M | 09/04/2026 | |
| 19 | GPT-5.5 Pro | OpenAI | $30.00 | $180.00 | 1.1 M | 04/23/2026 | |
| 20 | GPT-5.4 Pro | OpenAI | $30.00 | $180.00 | 1.1 M | 03/05/2026 | |
| 21 | Lyria 3 Clip Preview | $0.000 | $0.000 | 1 M | 03/25/2026 | ||
| 22 | Lyria 3 Pro Preview | $0.000 | $0.000 | 1 M | 03/25/2026 | ||
| 23 | DeepSeek V4 Flash 0731 | DeepSeek | $0.016 | $0.640 | 1 M | 07/31/2026 | |
| 24 | DeepSeek V4.1 Flash | DeepSeek | $0.021 | $0.891 | 1 M | 09/10/2026 | |
| 25 | DeepSeek V4 Flash 0423 | DeepSeek | $0.091 | $0.182 | 1 M | 04/24/2026 |
Frequently asked questions
Which AI model has the largest context window?
Grok 4.20 Multi-Agent, by xAI: 2 M tokens of context ($1.25 input / $2.50 output per million tokens), as of 10/14/2026.
How is this list sorted?
By context window, largest first; ties by input price. Only chat models released in the last 12 months (25 in total).
Where do the prices come from and how often are they updated?
From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.
What does price per million tokens mean?
It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.
Sources: OpenRouter, models.dev and LiteLLM. Prices in USD per million tokens, list price, no volume discounts. Prompt tokens are an estimate; each provider's tokenizer may differ.