Anthropic's Claude Fable 5.1: better coding and research at up to 45% less cost
The Decoder · rss · 2026-09-02
Anthropic launched Claude Fable 5.1 and Mythos 5.1, its most capable models yet. Fable 5.1 doubles its predecessor's Terminal-Bench-Science score and improves agentic coding by over 30%, while costs drop by up to 45% for long autonomous runs with many tool calls.
More from Models
- Testing unreleased Gemini 3.8 Flash: no citations shown for top-of-funnel queries — gaganghotra_ · 2026-09-03
- Hidden-bug eval across 105 issues: Fable 5.1 finds 43, none fixes all — cost per model compared — PawelHuryn · 2026-09-03
- X open-sources new For You algorithm code: long dwell drives retrieval, bots can trigger account review — Kyrannio · 2026-09-03
- Gemini 3.8 Flash reverse-engineers Kerbal save files to build and land a Mun rocket — dosco · 2026-09-03
- User calls out model for double-standard answers on gendered scenario questions — Ribbitz_bow_tie27 · 2026-09-03
- Redditor Predicts Astra Model Release Tomorrow at 1pm PT Based on X Teasers — dolo937 · 2026-09-03