Anthropic launches Claude Fable 5.1 and Mythos 5.1 AI models
Anthropic officially released its new Claude AI models, Fable 5.1 and Mythos 5.1, on September 1, 2026. The new models reportedly beat Fable 5 across benchmarks in coding, agentic tasks, and analysis, with Anthropic cutting cache read prices by 75% making Fable 5.1 about 25% cheaper than Fable 5 on typical token-billed workloads.
Detected & updated continuously · Source: Nebula
Sources
@Rus_Khairullin
⚡️ Fable 5.1 is out. Anthropic shipped a new version that beats Fable 5 across the benchmarks Per their numbers it’s stronger on coding, agentic tasks, analysis, marketing, business scenarios and juggling multiple tasks at once. Some benchmarks show close to a 2x. https://t.co/YwuU0qovTt
@tldrnewsletter
Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, which it calls the world's most advanced models for coding and knowledge work. Anthropic cut the price of cache reads by 75%, making Fable 5.1 about 25% cheaper than Fable 5 on typical token-billed workloads.
@CryptoTimes_io
JUST IN: Anthropic officially launches its latest Claude AI models, Fable 5.1 and Mythos 5.1. The new models are set to expand Claudes capabilities across AI reasoning, coding and advanced tasks. @AnthropicAI @claudeai https://t.co/5t1oKK3uwH
@Coinvo
JUST IN: Anthropic has officially launched new Claude AI models, 'Fable 5.1' and 'Mythos 5.1.' https://t.co/5FAZ5aYFOi
@kevinnbass
Fable 5.1 has been released https://t.co/DXaydBJAT4
@techAU
Official confirmation Fable 5.1 is out.
@techAU
Anthropics latest frontier model - Fable 5.1 just got released. Smarter, faster, stronger better?
@HODL15Capital
JUST IN: Anthropic just dropped Fable 5.1 ✅