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Claude Fable 5

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3 articles First covered Jun 9, 2026, latest Aug 3, 2026
An Alibaba Group office building with the company's orange logo sign above the entrance and cars parked outside.
AI·

Alibaba's Qwen3.8-Max beats Fable 5 on Terminal-Bench, and the weights go public next week

Qwen3.8-Max is a 2.4-trillion-parameter MoE that tops Claude Fable 5 on Terminal-Bench 2.1 and trails it badly on SWE-bench Pro. It's the first open Max-tier Qwen.

Anthropic's announcement artwork for Claude Fable 5 and Claude Mythos 5, a soft gradient panel with the Claude wordmark.
AI·

Claude Fable 5 is Anthropic's first public Mythos-class model. It tops SWE-Bench Pro at 80.3%.

Claude Fable 5 hits 80.3% on SWE-Bench Pro and ships on Bedrock and Copilot at $10/$50 per million tokens, free on paid plans only through June 22.

A hand holds a smartphone showing the Claude Mythos app logo against a dark backdrop with Anthropic's orange burst symbol.
Policy·

Anthropic is sending Mythos 5, the model it called too dangerous, to cyberdefenders and the US government

Mythos 5 is the same model as Fable 5 with cyber safeguards lifted, going to Project Glasswing defenders and, Anthropic says, ~150 orgs across 15+ countries.