Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives
Anthropic today introduced Claude Fable 5.1 and Claude Mythos 5.1, which the company says are the "world's most advanced models for coding and knowledge work." According to Anthropic, Claude Fable 5.1 sets a new standard for coding, knowledge work, and long-running problem-solving tasks. It achieves similar or better results than Fable 5 at low or medium effort, and has much higher performance at higher effort tiers. It outperforms Fable 5, Opus 5, and OpenAI's GPT–5.6 Sol across multiple benchmarks. Fable 5.1 and Mythos 5.1 are the same model, but with different safeguard levels. Fable 5.1 is available to everyone, but Mythos 5.1 is limited to U.S. companies and individuals participating in Anthropic's trusted access programs. There's a new Life Sciences Verification Program that allows Mythos 5.1's advanced biology capabilities to be used for scientific research, with open enrollment for scientists coming soon. invisible watermarking for text generated by Claude, and Anthropic is rolling out a detection API in a private preview. The API is available to eligible organizations as required by EU law. Tag: Anthropic This article, "Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives" first appeared on MacRumors.com Discuss this article in our forums
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