Flagship models with the largest context window
Rule: Sorted by context window from the maker's docs, largest first, then by max output. This ranks one published spec. It is not a quality test.
| # | Name | Context window | ||
|---|---|---|---|---|
| 1 |  GPT-5.6 SolOpenAI | 1,050,000 tokens | ||
| 2 | GPT-6 AstraOpenAI | 1,050,000 tokens | ||
| 3 |  Gemini 4 ArgonGoogle | 1,048,576 tokens | ||
| 4 | Kimi K3Moonshot AI | 1,048,576 tokens | ||
| 5 | Kimi K3.1 ProMoonshot AI | 1,048,576 tokens | ||
| 6 |  Claude Fable 5Anthropic | 1M tokens | ||
| 7 | Claude Fable 5.1Anthropic | 1M tokens | ||
| 8 | Claude Fable 5.2Anthropic | 1M tokens | ||
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| 9 | Claude Mythos 5Anthropic | 1M tokens | ||
| 10 | Claude Mythos 5.1Anthropic | 1M tokens | ||
| 11 | Claude Mythos 5.2Anthropic | 1M tokens | ||
| 12 | Claude Opus 5.5Anthropic | 1M tokens | ||
| 13 | GLM-5.3Z.ai | 1M tokens | ||
| 14 |  Grok 4.7xAI | 500,000 tokens | ||
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Questions
Which flagship model has the largest context window
GPT-5.6 Sol, 1,050,000 tokens, per developers.openai.com.