Claude Fable 5
Claude Fable 5 is an API-only (closed weights) language model from Anthropic, released June 9, 2026. The context window is 1M tokens. On the Epoch Capabilities Index it scores 164.1, rank 11 of 256 rated models. API price: $10 input / $50 output per million tokens.
Today we’re launching Claude Fable 5: a Mythos-class1 model that we’ve made safe for general use. Fable 5’s capabilities exceed those of any model we’ve ever made generally available.
Check it against your own PC →
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Reasoning | 35.2 | Chess Puzzles, SimpleBench, Mystery Game Puzzles |
| Math | 79.1 | ProofBench, OTIS Mock AIME 2024-2025, FrontierMath-Tiers-1-3-v2-Private, FrontierMath-Tier-4-v2-Private |
| Coding | 77.3 | GSO-Bench, MirrorCode, FrontierSWE, DeepSWE |
| Knowledge | 80.3 | GPQA diamond, SimpleQA Verified |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| OTIS Mock AIME | 100.0% |
| ProofBench | 95.0% |
| FrontierMath (Tiers 1–3) | 91.6% |
| FrontierMath-Tier-4-v2-Private | 90.2% |
| GPQA Diamond | 84.5% |
| GSO-Bench | 78.4% |
| SimpleBench | 78.3% |
| SimpleQA Verified | 70.7% |
| MirrorCode | 70.0% |
| DeepSWE | 69.9% |
| Mystery Game Puzzles | 47.1% |
| FrontierSWE | 47.0% |
| Chess Puzzles | 44.2% |
| EBR-bench | 39.5% |
| Remote Labor Index | 16.1% |
| Furniture Assembly | 8.3% |
Links
Announcement · Epoch AI benchmarks
Models with a similar score
GPT-6.1 Terra · Claude Fable 5.1 · Claude Sonnet 5.5 · Gemini 4 Argon · Claude Opus 5 · GPT-6 Sol · GPT-5.6 Sol · GPT-5.5 Pro
More from Anthropic
Claude Fable 5.2 · Claude Haiku 5.5 · Claude Sonnet 5.5 · Claude Opus 5.5 · Claude Fable 5.1 · Claude Opus 5 · Claude Sonnet 5 · Claude Mythos 5