#claude-fable-5

Claude Fable 5 Just Shipped: 80.3% on SWE-Bench Pro, 2× Opus 4.8 Pricing, Free Through June 22

Anthropic released the first publicly available Mythos-class model today — Claude Fable 5, with safeguards that fall back to Opus 4.8 on high-risk prompts. 80.3% SWE-Bench Pro (11 points over Opus 4.8). $10/$50 per 1M tokens. Free on Pro/Max plans until June 22, then credit-metered.