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The removal of `budget_tokens` is a hard breaking change that requires code updates before migrating from Opus 4.7 to 4.8, while the new `speed: "fast"` mode and mid-session system messages extend what agents can do within a single session.
The Stripe demonstration — a 50-million-line codebase migration completed in one day versus an estimated two months — is the concrete case the post uses to illustrate Fable 5's positioning as a model for sustained, long-context, multi-step work rather than short demos.
The post reports that Fable 5 tops coding and reasoning benchmarks and delivered immediate, measurable acceleration on large-scale real-world tasks, marking a notable step-change in agentic coding capability.
Fable 5 represents Anthropic's first public release of a Mythos-class model, with notably higher vendor-reported coding benchmark scores than prior models, and introduces an automatic safety fallback that routes the riskiest request categories to a different model entirely.
Developers and product teams can now iterate from idea to working prototype faster by using conversational AI for initial design generation, reducing friction between design intent and implementation while preserving existing design tool workflows for production refinement.