Anthropic releases Claude Opus 5.5
The first Claude 5.5 model adds lower published Opus rates, a 1M context window and always-on adaptive thinking with migration changes for tool workflows.
By Pınar · Updated 7 October 2026
What this changes for UK buyers
Long-running agent teams may reduce token rates, but forced tools, thinking blocks and older computer-use integrations need retesting.
What buyers should do
Pin the new model in a test environment and compare accepted tasks, tool failures, cache use, latency, review and complete cost before migration.
Primary announcement
Anthropic Claude Opus 5.5 launch ↗This is a dated source-linked buyer briefing. A vendor announcement does not prove UK account eligibility, an independent performance result or regulatory compliance. Open the primary source and confirm the exact plan before changing a production workflow.
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