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9 stories for“Claude Opus 5.5”
Anthropic's new flagship matches Claude Fable 5.1 on most work at a fifth of the delay and a fifth less cost per token, and beats it outright on agentic coding, computer use and chart reading. Input is 4 dollars, output 20, a fifth cheaper than Opus 5.
Sep 24, 2026
Anthropic's Claude Fable 5 debuts a new Mythos class above Opus, pairing frontier capability with automatic safety routing for risky queries.
Jun 9, 2026
Anthropic's new Opus model targets long-running coding and professional workflows with a 1-million-token context window, adaptive effort and the same API price as Opus 4.8.
Jul 24, 2026
Anthropic priced its newest model exactly where the previous one sat, then claimed near-flagship results. The pitch is aimed squarely at the mid-difficulty work that fills enterprise queues.
Aug 3, 2026
From Claude 3.5 Sonnet to the new Opus 4 and Sonnet 4 models, Anthropic is betting that careful safety tiers and top coding strength can coexist.
May 28, 2025
Claude Mythos 5 strips Fable 5's safety classifiers for vetted users only, forcing a fresh argument over who gets to use AI without a leash.
Jul 8, 2026
Released 3 September, Astra found genuine security flaws in testing and posted OpenAI's best-ever reasoning scores, but Artificial Analysis still ranks Claude Fable 5.1 ahead of it on broad intelligence and coding. Pricing matches Fable at 10 and 50 dollars.
Sep 24, 2026
