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Claude Fable 5.1 — Model Tracker
Claude Fable 5.1 in the Model Tracker: every value read on the maker's own pages, with its day.
- Maker
- Anthropic — platform.claude.com, read 2026-10-16
- Released
- 2026-09-01 — platform.claude.com, read 2026-10-16
- Status
- Generally available — www.anthropic.com, read 2026-10-16
- Retired
- Not confirmed
- Takes
- Text, Image — platform.claude.com, read 2026-10-16
- Returns
- Text — platform.claude.com, read 2026-10-16
- Open weights
- Not confirmed: The Anthropic model overview and linked system-card reference do not state whether the model's weights are open or downloadable.
- Licence
- Not confirmed: The Anthropic model overview does not publish a licence for the model.
- Context window
- 1,000,000 tokens — platform.claude.com, read 2026-10-16
- Longest answer
- 128,000 tokens — platform.claude.com, read 2026-10-16
- Knowledge cutoff
- 2026-06 — platform.claude.com, read 2026-10-16
- API price, input
- USD 10 per 1M tokens — platform.claude.com, read 2026-10-16
- API price, output
- USD 50 per 1M tokens — platform.claude.com, read 2026-10-16
- Where
- API, Consumer app, Cloud marketplaces — platform.claude.com, read 2026-10-16
- Parameters
- Not confirmed: The Anthropic model overview does not publish a parameter count.
- Model card
- https://www.anthropic.com/claude-fable-5-1-mythos-5-1-system-card — platform.claude.com, read 2026-10-16
Sources
- Claude Fable 5.1 - Claude Platform Docs (read 2026-10-16)
- Pricing - Claude Platform Docs (read 2026-10-16)
- Model deprecations - Claude Platform Docs (read 2026-10-16)
- Introducing Claude Fable 5.1 and Claude Mythos 5.1 (read 2026-10-16)