Anthropic Launches Claude Fable 5.1 and Mythos 5.1
Anthropic says the models cut cache read costs by 75% and deliver stronger coding and research performance than Opus 5.
- Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 on Tuesday, its most powerful models to date, sharing identical underlying weights but differing in safeguard configurations.
- The new models succeed the Fable 5 and Mythos 5 line released earlier this year, supporting a 1-million-token context window, 128,000-token maximum output, and always-on adaptive thinking.
- Benchmark results show Fable 5.1 scoring 52.6% on Terminal-Bench-Science, more than double its predecessor's 24.7%, while cache read costs dropped 75% to $0.25 per million tokens.
- Cognition announced it would move all Opus 5 traffic in its Devin product to Fable 5.1 on launch day, while Jane Street Capital noted the model "remains readable over long, multi-step tasks."
- Anthropic added invisible statistical watermarking to comply with the Act, while introducing Enterprise Frontier Safeguards to enable private model usage for regulated industries starting fall 2026.
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TechJuiceAnthropic launches Claude Fable 5.1 and Mythos 5.1
Fable 5.1 is now generally available, while Mythos 5.1 is only available through Anthropic’s “trusted access” programmes. Read more: Anthropic launches Claude Fable 5.1 and Mythos 5.1
New models of Anthropic have been enhanced in terms of code writing, research and cybersecurity.
Anthropic launches Claude Fable 5.1 and Mythos 5.1 models claimed to be ‘world’s most advanced models for coding and knowledge work’
Tech News News: Anthropic has launched two new AI models, Claude Fable 5.1 and Claude Mythos 5.1, with a focus on coding, research and complex knowledge work. The com.
Anthropic Unveils Claude Fable 5.1 and Mythos 5.1 for Coding and Knowledge Work
Get latest articles and stories on Business at LatestLY. Artificial intelligence company Anthropic announced the launch of Claude Fable 5.1 and Claude Mythos 5.1, describing them as the world's most advanced models for coding and knowledge work. Business News | Anthropic Unveils Claude Fable 5.1 and Mythos 5.1 for Coding and Knowledge Work.
Anthropic's Claude Fable 5.1 claims world's best in coding, knowledge tasks; cites Venus map as proof
Anthropic has launched Claude Fable 5.1 and Mythos 5.1, describing them as its most advanced AI models yet. The models offer faster coding, stronger research capabilities, improved safeguards and up to 45% lower running costs.
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