Anthropic releases Claude Fable 5.1 and Mythos 5.1

Fable 5.1 scores 55.8% on Terminal-Bench 4.0 in Claude Code, ahead of Fable 5 (42%) and Opus 5 (52.3%). Pricing matches Fable 5, but API cache reads drop 75% to $0.25/MTok; Perplexity ranked it first on its August WANDR eval at 0.601.
How this story unfolded
6 days · 28 reports · 79 community posts · 107 of 111 shown
- Sep 1
v2.1.257github.com
2.1.257code.claude.com
Introducing Claude Fable 5.1youtube.com
Anthropic Says New Fable 5.1 AI Model Is Cheaper, Better at Codingbloomberg.com
Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache readsventurebeat.com
Claude Fable 5.1 now available on AI Gatewayvercel.com
Debugging across the whole stack with Claude Fable 5.1youtube.com
Claude Fable 5.1 builds the ops review in Slackyoutube.com
Claude Fable 5.1 runs the forecast overnightyoutube.com
Introducing Claude Fable 5.1 on AWSaws.amazon.com
Anthropic Ships Claude Fable 5.1, More Than Doubling Its Predecessor on Key Benchmarkdecrypt.co
Anthropic’s new Fable release is cheaper, less restrictivetechcrunch.com
Anthropic’s Fable 5.1 is a bit cheaper, a bit smarter, and refuses a lot lessthenewstack.io
Meet Claude Fable 5.1youtube.com
Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Readsmarktechpost.com
Claude Fable 5.1 watermark: It has a blind spot developers can’t ignorethenewstack.io
Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic worktheverge.com
- Sep 2
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