Mythos 5 & Fable 5 Launched

Short summary

Sam Witteveen reviews Anthropic's new Fable 5 model (Mythos Class), covering performance benchmarks, new pricing tiers, and safety changes including data retention shifts. The 14-minute video includes a live demo and boundary testing, showing how Fable 5 compares to previous models. Key for product teams: stricter usage limits and new subscription structure require reassessment of API cost assumptions.

• •Fable 5 (Mythos Class) launched with improved benchmarks and new tiered pricing structure
• •Video covers safety limits, data retention policy changes, and security implications
• •Developers need to reassess API costs and understand new subscription/usage requirements

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