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Claude Fable 5.1

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Anthropic's highest-tier generally available Claude model, with a 1M-token context window and 128K output

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TrustList summary

Claude Fable 5.1 is a generally available AI model from Anthropic, released on 1 September 2026. It has a context window of 1 million tokens and can produce up to 128K tokens of output in one response.

Main features

  • Terminal-Bench-Science 0.1: 52.6%, up from 24.7% for Claude Fable 5.
  • Terminal-Bench 4.0: 55.8%.
  • CursorBench 3.2.0: 73.4%.
  • AutomationBench: 31.4%.

These are the results Anthropic reports for the model. A restricted-access companion, Claude Mythos 5.1, is the same underlying model offered to vetted organisations rather than sold as a separate product.

Key facts

  • Released: 1 September 2026
  • Context window: 1 million tokens
  • Maximum output: 128K tokens

Summary written by TrustList from the business's own published information, Oct 2026.

Benchmarks & AI stats

AI model rankings
BenchmarkOfficialCommunity avg
AutomationBenchagent31.4 %-
CursorBench 3.2.0code73.4 %-
Terminal-Bench 4.0agent55.8 %-
Terminal-Bench-Science 0.1agent52.6 %-

“Official” values are editor-approved and feed the ranking. “Community avg” is the mean of member submissions (shown for transparency; it never affects the ranking until an editor approves a value).

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Recommendations
Coming soon
Complaints
Coming soon

Updated 9/16/2026

What the business tells TrustList

Founded
2026 (0 years) evidence sent

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