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MacRumors
Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives
Anthropic has unveiled Claude Fable 5.1, which the company claims is a leading model for coding and knowledge work tasks. The new model shows significant advancements compared to its predecessor, achieving similar or better results with fewer resources, and notably reduces cybersecurity false positives by 60%. Claude Mythos 5.1 accompanies Fable 5.1 but is restricted to select U.S. participants in trusted programs. The introduction of a Life Sciences Verification Program is also a highlight, allowing scientists to utilize advanced features for research. Cost reductions of up to 45% make it financially appealing, making this launch potentially transformative in AI application in various sectors.
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Published 1 Sept 2026, 19:45 UTC1 min read
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Summary
TL;DR
- Fable 5.1 outperforms Fable 5 and OpenAI's GPT-5.6 in multiple benchmarks.
- 60% reduction in cybersecurity false positives.
- Model available for all, while Mythos 5.1 is limited to select U.S. users.
- Includes a Life Sciences Verification Program for scientific research.
- Costs 25-45% less than previous versions.
Interesting facts
- Fable 5.1 features invisible watermarking for generated text.
- Detection API rollout aligns with EU law requirements.
- Improvements allow for discovery of software vulnerabilities.