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Anthropic releases Claude Fable 5.1 and Mythos 5.1 with tiered safeguards

By PulseAugur Editorial · [1 sources] ·

Anthropic has launched Claude Fable 5.1 and Claude Mythos 5.1, presenting them as two access tiers of the same underlying model, distinguished by their safeguard levels. Fable 5.1 is broadly available on platforms like AWS, Google Cloud, and Azure, while Mythos 5.1 is restricted to trusted-access programs and currently only for US organizations. The release includes notable benchmark improvements in areas like agentic coding and science, alongside a significant reduction in cache-read pricing, making it up to 45% cheaper for certain workloads. AI

IMPACT Sets new SOTA on agentic coding and science benchmarks, while reducing costs for cache-heavy workloads.

RANK_REASON Frontier-lab model release with system card [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic releases Claude Fable 5.1 and Mythos 5.1 with tiered safeguards

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65 / 100
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Significant
Frontier-lab model release with system card [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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model release, product
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High
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · soy ·

    Anthropic Ships Claude Fable 5.1 Broadly, Restricts Claude Mythos 5.1 to Trusted Access

    <p>Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 as two access tiers of what the company describes as the same underlying model, differentiated only by safeguard level. Fable 5.1 is generally available across Anthropic's own platform, AWS, Google Cloud, and Microsoft …

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