Anthropic unveils Claude Fable 5.2, Mythos 5.2 with coding gains and lower prices

Anthropic has released Claude Fable 5.2 and Mythos 5.2, with significant improvements in handling complex software engineering tasks and reduced API prices by 20% compared to the previous versions. Fable 5.2 and Mythos 5.2 share the same underlying model but have different safeguards, with Fable being broadly available and Mythos restricted to vetted cybersecurity and life sciences organizations.

The models are priced at $8 per million input tokens and $40 per million output tokens, down from $10 and $50, respectively. The new versions can generate output up to 30% faster than their predecessors and have achieved coding benchmark scores comparable to Opus 5.5 at its highest setting, at roughly half the cost per task. While these improvements could make long-running AI agents viable for software migrations and scientific research, Anthropic also cautions that reliability challenges persist and that organizations will need to monitor agent activity and run these systems in isolated environments.

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