Claude Fable 5
Claude Fable 5 is Anthropic's most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Shares its base model with the invitation-only Claude Mythos 5.
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Context
1M
Weights
Closed
API only
Input
$10
/1M tok
Output
$50
/1M tok
Cache read
$1
0.10x input
Cache write
$12.50
1.25x input
Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter
Reported on 40 evals across 22 domains - best 98.5% on τ²-bench (Tau²-bench) · #4 of 321
Reported eval scores
40Head-to-heads
29benchmark comparisons against other models
vs Claude Opus 4.840 shared evalsvs GPT-5.539 shared evalsvs Gemini 3.1 Pro Preview36 shared evalsvs Claude Sonnet 4.628 shared evalsvs Claude Opus 4.728 shared evalsvs Claude Opus 4.626 shared evalsvs GPT-5.426 shared evalsvs Kimi K2.526 shared evalsvs GLM 5.125 shared evalsvs GPT-5.4 Mini25 shared evalsvs Claude Sonnet 4.524 shared evalsvs GPT-5.224 shared evalsvs Qwen3.6 Plus24 shared evalsvs GPT-5 Mini23 shared evalsvs Claude Opus 4.523 shared evalsvs Grok 4.1 Fast23 shared evalsvs Claude 4 Sonnet22 shared evalsvs GPT-5 Nano21 shared evalsvs DeepSeek V3.220 shared evalsvs GLM 4.720 shared evalsvs Gemini 2.5 Pro19 shared evalsvs GPT-6 Astra18 shared evalsvs gpt-oss-120b18 shared evalsvs GPT-516 shared evalsvs GPT-4o13 shared evalsvs GPT-4o-mini12 shared evalsvs GPT-4.1 Nano11 shared evalsvs GPT-4.1 Mini10 shared evalsvs GPT-4.110 shared evals