Versions side by side — rows that differ across these models are highlighted.
| 3 models | Go Gemini 3.1 Pro View → | Cl Anthropic Claude Fable 5 View → | Op OpenAI GPT-5.5 View → |
|---|---|---|---|
| Maker | Anthropic | OpenAI | |
| Tier | Flagship | Flagship | Flagship |
| Status | Default | Active | Default |
| Context window | 2M ctx | 1M ctx | 1M ctx |
| Knowledge cutoff | Dec 1, 2025 | Jan 1, 2026 | Jan 1, 2026 |
| Released | Feb 1, 2026 | Jun 9, 2026 | Apr 23, 2026 |
| API string |
| gemini-3.1-pro |
| claude-fable-5 |
| gpt-5.5 |
| Note | Current flagship; 2M-token context window (largest production context of any model family), strong coding/reasoning/multimodal. GA February 2026. | First publicly available Mythos-class model (above Opus); Mythos 5 weights with safety classifiers active. 1M context, $10/$50, highest benchmarks of any GA model. Refusals return stop_reason refusal; mandatory 30-day retention. | Current flagship general-purpose model; strong coding, reasoning, writing, and agentic tasks. Tiered pricing above a context threshold. |
|---|
