Claude Fable 5 is an AI model released by Anthropic on Jun 9 2026, 12 days after Claude Opus 4.8. Benchmark results (shown above) cover SWE-Bench Pro, SWE-Bench Verified, Terminal-Bench 2.1, OSWorld-Verified, and GDPval-AA.
About Anthropic: AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.