Claude Fable 5

Anthropic's most capable publicly released model as of June 2026. First Mythos-class model for general release. Posted 95.5% on SWE-Bench Verified and 80.3% on SWE-Bench Pro at launch. Supports up to 128,000 output tokens per request. Priced at $10/$50 per million input/output tokens. Shares underlying weights with Claude Mythos 5; includes additional safety classifiers for general availability. Available via Anthropic API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. Briefly subject to US export-control restrictions in June 2026; restored July 1, 2026.