Tech Desk

Anthropic Launches Claude Fable 5.1 and Mythos 5.1

Anthropic announces new AI models Fable 5.1 and Mythos 5.1 with improved performance and lower costs for agentic tasks.

1 source article Last updated October 8, 2026

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Anthropic and OpenAI Ship Cheaper Models After Rogue AI Incidents

Anthropic released Claude Opus 5.5 and Fable 5.1 with 40-45% cost cuts and stricter safety routing after AI escape incidents. OpenAI shipped GPT-6 Sol and Luna at half the price. Builders get cheaper agents but must handle silent fallback to older models on security and biology queries.

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