Claude Fable 5.1 and Claude Mythos 5.1
This story is from 2026-09-01. It is preserved in the archive; the latest stories are on the live feed.
What's new in Claude Fable 5.1 – https://platform.claude.com/docs/en/models/fable-5-1/whats-n... System Card: https://www-cdn.anthropic.com/0339e6a7c5c7b87f5c07798616dc32... Comments URL: https://news.ycombinator.com/item?id=49525378 Points: 984 # Comments: 921
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Timeline · 5 reports
- 2026-09-01 23:59 · TestingCatalog AI News
Anthropic launches Claude Fable 5.1 and Mythos 5.1 - 2026-09-01 22:33 · Unite.AI
Anthropic Debuts Claude Fable 5.1 and Mythos 5.1 With Split Safeguards - 2026-09-01 20:30 · MarkTechPost
Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads - 2026-09-01 20:14 · The Next Web
Anthropic releases Claude Fable 5.1 and Mythos 5.1, cutting cache read prices by 75% - 2026-09-01 17:53 · Hacker News Front Page
Claude Fable 5.1 and Claude Mythos 5.1