Anthropic announces updates to Claude Fable 5's biology safeguards that reduce false positives, cutting biology-related fallbacks by about 85%. This allows Fable 5 to assist with a wider range of biology tasks, including everyday health and educational questions, while still falling back to Opus 5 for dual-use requests.
Claude Fable 5.1 now available in GitHub Copilot for Pro+, Max, Business, Enterprise users
Claude Fable 5.1 now available on Amazon Bedrock and Claude Platform on AWS.
Amazon1 SepClaude Fable 5 (High) · 1,504 (1,499–1,508) · 43,399 votes
Claude Fable 5 · 1,504 (1,499–1,508) · 4th
Claude Fable 5 · 1,504 · $20.00 per 1M tokens
Claude Fable 5 · 1,504 · $20.00 per 1M tokens
LMArena, CC BY 4.0, 20 October 2026 · prices OpenRouter, list price blended 3:1, read 22 October 2026
