Claude Fable 5.1 Benchmarks, Pricing & Rankings
Anthropic · 2026-08-18 · Closed · Current
Snapshot 2026-10-14 · updated weekly
Claude Fable 5.1 ranks #4 of 42 on the AMR leaderboard.
Claude Fable 5.1 benchmark scores
| GPQA Diamond | 93.4% | |
| MMLU-Pro | 89.5% | |
| SWE-Bench Verified | 77.2% | |
| AIME 2025 | 93.1% | |
| LiveCodeBench v6 | 81.9% | |
| Arena Elo | 1466 |
Claude Fable 5.1 price, speed & context
Input price
$4
per 1M tokens
Output price
$20
per 1M tokens
Speed
142
tok/s
Context
400K
tokens
About Claude Fable 5.1
Claude Fable 5.1 is Anthropic’s long-form workhorse: near-flagship quality at half the Opus price, with the best writing Elo in its price class.
Models around Claude Fable 5.1 in the rankings
More Anthropic models
Claude Fable 5.1 FAQ
Where does Claude Fable 5.1 rank?
Claude Fable 5.1 ranks #4 of 42 tracked AI models on the AMR aggregate as of October 2026, with an aggregate score of 94.9. Its strongest dimension is GPQA Diamond at 93.4%.
How much does Claude Fable 5.1 cost?
Claude Fable 5.1 costs $4 per million input tokens and $20 per million output tokens on the standard API. At a typical 1:3 input/output agent workload, that blends to roughly $16.00 per million tokens.
What is the Claude Fable 5.1 context window?
Claude Fable 5.1 supports a 400K token context window and generates at a median 142 output tokens per second. That context fits roughly 267 standard documents in a single prompt.
Is Claude Fable 5.1 open source?
No — Claude Fable 5.1 is a closed model available only through Anthropic’s official API and authorized cloud partners.
What is better than Claude Fable 5.1?
GPT-6 Astra ranks one place higher at #3 with an AMR score of 95.6. Claude Fable 5.1 still wins 0 of the tracked dimensions head-to-head — check the comparison table to see exactly which.