Claude Fable 5
by Anthropic · ID claude-fable-5 · Released 2026-06 · Proprietary
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ELO Score
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MMLU
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HumanEval
1M
Context Window
$10.00
Input Price
About Claude Fable 5
Anthropic's first publicly available Mythos-class model (June 9, 2026) and its most powerful general-release model ever. Leads agentic coding at 80.3% on SWE-bench Pro (vs 69.2% for Opus 4.8), with a 1M-token context window and 128K max output. Built for long-horizon autonomous work — Stripe used it to compress a months-long codebase migration into a single day. High-risk queries (e.g. cybersecurity, biology) are routed to Opus 4.8; safeguards trigger in under 5% of sessions. Priced at $10/$50 per MTok, with up to 90% input savings via prompt caching.
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