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9to5mac
Anthropic upgrades Claude with new Fable 5.1 model, details here
Anthropic has enhanced its Claude AI model with the introduction of Fable 5.1, which aims to set a new benchmark in coding, knowledge work, and long-term problem-solving. The upgrade not only improves performance but also significantly lowers operational costs compared to the previous model, Fable 5. The new model demonstrates its capabilities by solving previously unresolved software issues experienced by clients, showcasing a significant leap in AI proficiency. Furthermore, the upgrade is part of a wider strategy that includes a specific version tailored for high-security tasks, such as those in cybersecurity and life sciences.
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Published 1 Sept 2026, 18:30 UTC2 min read
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Summary
TL;DR
- Fable 5.1 is a significant upgrade over Fable 5.
- The new model enhances coding and long-running problem-solving tasks.
- Performance improvements come with cost reductions of around 25-45%.
- Fable 5.1 can address software issues overlooked by engineers.
- Mythos 5.1 is released alongside Fable 5.1 for trusted access programs.
Interesting facts
- Fable 5.1 achieves better results at lower costs, marking an industry milestone.
- The model's ability to fix longstanding software issues sets it apart.
- Changes in cache read pricing potentially revolutionize AI operating costs.