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Person: "ethancaballero"
Claude Fable 5.1 and Claude Mythos 5.1
claude-fable-5.1 claude-mythos-5.1 astra anthropic openai nous-research perplexity-ai coding model-architecture safety enterprise-ai benchmarking cache-optimization cybersecurity recurrent-depth chain-of-thought model-transparency sama alexalbert__ eliebakouch ethancaballero valsai stevendillmann scaling01 artificialanlys theo teknuim gregkamradt kylebrussell boazbaraktcs kimmonismus
Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, which share base weights but differ in safeguards and routing, showing improved coding performance and usability with a 75% cache-read price cut to $0.25/MTok. Benchmarks highlight strong coding/science results, though Fable 5.1 costs about 20% more per task than its predecessor. Adoption revealed aggressive safety triggers framed as Enterprise Frontier Safeguards for enterprise deployments. Meanwhile, OpenAI previewed Astra, its first model reaching the Critical cybersecurity preparedness level, demonstrating advanced cyber capabilities and employing a recurrent depth/looped transformer architecture, sparking debate on its impact on chain-of-thought reasoning and model transparency. Sam Altman noted safety work slowed Astra's deployment, indicating future models may prioritize safeguards over speed.