Best LLM with a 1M token context window
- models ranked
- 71
- context of #1
- 1M
- lead over #2
- +1.6
Overall index · read October 21
As of October 21, 2026, Anthropic Claude Opus 5.5 leads 71 models that qualify, with 57.6 on the overall index, ahead of Anthropic Claude Sonnet 5.5 (56.0) and Anthropic Claude Fable 5.1 (53.4).
| Rank | Model | Overall index | Evidence | Coding index | Output $/Mtok |
|---|---|---|---|---|---|
| 1 | Claude Opus 5.5 Anthropic | 57.6 | 92.2 | $20.00 | |
| 2 | Claude Sonnet 5.5 Anthropic | 56.0 | 88.9 | $10.00 | |
| 3 | Claude Fable 5.1 Anthropic | 53.4 | 89.1 | $50.00 | |
| 4 | GPT-6 Astra OpenAI | 52.7 | 88.7 | $50.00 | |
| 5 | Gemini 4 Argon Google | 52.6 | 80.5 | $10.00 | |
| 6 | GPT-6.1 Sol OpenAI | 51.8 | 88.7 | $10.00 | |
| 7 | Claude Opus 5 Anthropic | 50.8 | 81.8 | $25.00 | |
| 8 | Claude Fable 5 Anthropic | 49.6 | 82.1 | $50.00 | |
| 9 | Muse Spark 1.3 Meta | 48.1 | 79.7 | $4.25 | |
| 10 | GPT-6 Sol OpenAI | 47.6 | 82.8 | $10.00 | |
| 11 | GPT-5.6 Sol OpenAI | 47.0 | 76.7 | $20.00 | |
| 12 | MiMo-V2.6-Pro Xiaomi | 46.3 | 72.6 | $0.87 | |
| 13 | Qwen3.8 Max (0902) Qwen | 45.4 | 63.5 | $6.00 | |
| 14 | GLM 5.3 Z.ai | 44.8 | 73.1 | $1.40 | |
| 15 | Step 5 Preview StepFun | 43.7 | 71.4 | $2.70 | |
| 16 | Kimi K3 Moonshot AI | 43.6 | 61.8 | $11.936 | |
| 17 | Claude Haiku 5.5 Anthropic | 43.4 | 75.9 | $0.50 | |
| 18 | GPT-5.6 Terra OpenAI | 42.1 | 69.0 | $12.00 | |
| 19 | GLM 5.3 Flash Z.ai | 41.8 | 71.0 | $0.50 | |
| 20 | Claude Opus 4.8 Anthropic | 41.8 | 66.0 | $25.00 |
How this list is built
Generated from the dataset on every refresh. Nobody picks the order by hand.
Models with a listed context window of one million tokens or more, ordered by the Artificial Analysis Intelligence Index, highest first. The index is a composite of evaluations Artificial Analysis runs itself, published on a 0 to 100 scale.
- OpenRouter, fetched
- Artificial Analysis (via OpenRouter), fetched