Claude Opus 5.5 Is Officially Out
This is a AI post classified by Jev as Frontier models (a model release), kept by the AI Radar because it carries real work, not commentary.
Claude Opus 5.5 Is Officially Out - Opus 5.5 is a beast, it beats Fable 5.1 on Terminal-Bench 4.0, FrontierCode, CursorBench, GDPval-AA, HLE, OSWorld 2.0 and Chartography. - It even beats GPT-6 Astra on a couple of benchmarks, while Astra still leads on several others. - Pricing: $4 input / $20 output per 1M tokens, $0.20 cache reads / $5 cache writes, down from $5/$25 for Opus 5. - The bigger deal: Anthropic says 40% lower cost per task, thanks to both lower token prices and fewer tokens used. - Fast mode: $8 input / $40 output per 1M tokens, with up to 2.5× speed. Now I just need to test
Posted by Pankaj Kumar (16.9k followers) 1 h ago · 28 likes · 5.4k views · view the original post on X. Kept by the AI Radar as Frontier models.
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