Source-backed update · October 2026
Anthropic launches Claude Opus 5.5
The release targets complex work and publishes separate input, output and cache pricing.
What was announced
Anthropic announced Opus 5.5 on 22 September. The release positions it for complex work requiring sustained judgment and lists separate input, output and cache-read prices. Anthropic’s claimed reduction in typical running cost is distinct from the token-rate change and depends on its evaluations. The announcement also describes subscription usage-limit changes and safeguards. Fewertools has not independently reproduced the benchmark results. The source date records the launch; it does not mean that every later feature or limit is captured here.
Before adopting it
Check current availability and pricing, then trial a bounded task with an explicit acceptance standard.