4 September 2026
Anthropic releases Claude Fable 5.1 and Mythos 5.1 models
First reported
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- Anthropic, the company behind the Claude chatbot, released two updated Claude models with performance improvements.
- Cache reads, a way to reuse previously processed text and save costs, dropped to $0.25 per million tokens with a 75% reduction in pricing.
- Terminal-Bench-Science scores, a measure of how well models handle scientific reasoning tasks, more than doubled to 52.6%.
How it was covered
Deep Learning WeeklyEditorial team
Anthropic released two new Claude models with significant improvements: cache reads reduced by 75% to $0.25 per million tokens and Terminal-Bench-Science scores more than doubled to 52.6%.