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Claude Fable 5.1Closed
Tool use · Reasoning
Evaluation overview
Overall rank
#3
97.5 points · 200 models
Research rank
#1
100 points · 194 models
Data coverage
10 items
2 sources · updated through 2026-09-02
Domain performance
Coding#7 / 180
92.3
Research#1 / 194
100
Agents#2 / 146
98.3
Vision#2 / 80
98.1
Evaluation highlights
All evaluationsBasic information
- Context (input / output)
- 1M / 128K
- Release date
- 2026-09
- Input modalities
- Text · Image
- Output modalities
- Text
- Exact release date
- 2026-09-01
- Reasoning mode
- Adaptive (always on)
- Mode consolidation
- Claude Mythos 5.1 and Claude Fable 5.1 are the same model. Leaderboard.cn consolidates them under Claude Fable 5.1 and records Mythos 5.1 only as a trusted-access safeguard mode.
- API model ID
- claude-fable-5-1
- Reliable knowledge cutoff
- 2026-06
- Training data cutoff
- 2026-06
- Default reasoning effort
- high
Availability
AnthropicFull pricing
- Input
- $10 /1M
- Output
- $50 /1M
Related links
Version relationships
- Runtime modes
- Max