Largest Context Window AI Models
A large context window lets you skip retrieval plumbing and just hand the model the whole document, codebase, or chat history. The trade is cost and, often, recall: a model that advertises a million-token window does not necessarily reason well across all of it. Rank by size here, then verify the model actually uses the far end of its window for your task before committing.
Showing top 25 of 830 matching models · last synced 22 hours ago
Top pick right now: Pareto Code Router from OpenRouter. Its 2,000,000-token context window is the largest available right now.
| # | Model | Provider | Input $/Mtok | Output $/Mtok | Context | Capabilities |
|---|---|---|---|---|---|---|
| 1 |
Pareto Code Router
|
OpenRouter | N/A | N/A | 2,000,000 | N/A |
| 2 |
Grok 4 Fast
|
OpenRouter | $0.2 | $0.5 | 2,000,000 | vision, tools, reasoning, structured output |
| 3 |
Grok 4.1 Fast
|
OpenRouter | $0.2 | $0.5 | 2,000,000 | vision, tools, reasoning, structured output |
| 4 | Grok 4.1 Fast (Non-Reasoning) | xAI | $0.2 | $0.5 | 2,000,000 | vision, tools |
| 5 | Grok 4 Fast | xAI | $0.2 | $0.5 | 2,000,000 | vision, tools, reasoning |
| 6 | Grok 4.1 Fast | xAI | $0.2 | $0.5 | 2,000,000 | vision, tools, reasoning |
| 7 | Grok 4 Fast (Non-Reasoning) | xAI | $0.2 | $0.5 | 2,000,000 | vision, tools |
| 8 |
Auto Router
|
OpenRouter | N/A | N/A | 2,000,000 | vision, tools, reasoning, structured output |
| 9 |
Grok 4.20
|
OpenRouter | $1.25 | $2.5 | 2,000,000 | vision, tools, reasoning, structured output |
| 10 |
Grok 4.20 Multi-Agent
|
OpenRouter | $1.25 | $2.5 | 2,000,000 | vision, reasoning, structured output |
| 11 |
Grok 4.20 Multi - Agent Beta
|
OpenRouter | $2 | $6 | 2,000,000 | vision, reasoning |
| 12 |
Grok 4.20 Beta
|
OpenRouter | $2 | $6 | 2,000,000 | vision, tools, reasoning |
| 13 |
Llama 4 Scout
|
OpenRouter | $0.1 | $0.3 | 1,310,720 | vision, tools, structured output, open |
| 14 |
DeepSeek V4 Flash 0731
|
OpenRouter | $0.04 | $0.64 | 1,310,720 | tools, reasoning, structured output, open |
| 15 |
DeepSeek V4 Flash Latest
|
OpenRouter | $0.03 | $0.8 | 1,310,720 | tools, reasoning, structured output |
| 16 |
GLM-5.3
|
OpenRouter | $0.84 | $2.64 | 1,310,720 | tools, reasoning, structured output, open |
| 17 |
GLM Latest
|
OpenRouter | $0.5625 | $2.5 | 1,310,720 | tools, reasoning, structured output |
| 18 |
GLM-5.3-Flash
|
OpenRouter | $0.15 | $0.5 | 1,310,720 | vision, tools, reasoning, structured output, open |
| 19 |
GLM Flash Latest
|
OpenRouter | $0.075 | $0.25 | 1,310,720 | vision, tools, reasoning, structured output |
| 20 |
GPT-5.4 Pro
|
OpenRouter | $30 | $180 | 1,050,000 | vision, tools, reasoning, structured output |
| 21 |
Gemini 3 Pro Preview
|
OpenRouter | $2 | $12 | 1,050,000 | vision, tools, reasoning, structured output |
| 22 |
GPT-5.5
|
OpenRouter | $5 | $30 | 1,050,000 | vision, tools, reasoning, structured output |
| 23 |
GPT-5.4
|
OpenRouter | $2.5 | $15 | 1,050,000 | vision, tools, reasoning, structured output |
| 24 |
GPT-5.5 Pro
|
OpenRouter | $30 | $180 | 1,050,000 | vision, tools, reasoning, structured output |
| 25 |
MiMo-V2.5-Pro
|
OpenRouter | $0.435 | $0.87 | 1,050,000 | tools, reasoning, structured output, open |
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