What's new in Claude Opus 4.8 (opens in new tab)

Overview of new features and behavior changes in Claude Opus 4.8. --- Claude Opus 4.8 is Anthropic's most capable generally available model to date. It builds on Claude Opus 4.7. This page summarizes everything new at launch, including fast mode (research preview on the Claude API) and a lower 1,024-token minimum cacheable prompt length. ## New model | Model | API model ID | Description | |:------|:-------------|:------------| | Claude Opus 4.8 | claude-opus-4-8 | Anthropic's most capable...