- We've launched Claude Opus 4.6, our most intelligent model for complex agentic tasks and long-horizon work. Opus 4.6 recommends adaptive thinking (
thinking: {type: "adaptive"}); manual thinking (type: "enabled" with budget_tokens) is deprecated. Opus 4.6 does not support prefilling assistant messages. Learn more in What's new in Claude 4.6.
- The effort parameter no longer requires a beta header and now supports Claude Opus 4.6. Effort replaces
budget_tokens for controlling thinking depth on new models.
- We've launched the compaction API in beta, providing server-side context summarization for effectively infinite conversations. Available on Opus 4.6.
- We've introduced data residency controls, allowing you to specify where model inference runs with the
inference_geo parameter. US-only inference is available at 1.1x pricing for models released after February 1, 2026.
- The 1M token context window is now available in beta for Claude Opus 4.6, in addition to Sonnet 4.5 and Sonnet 4. Long context pricing applies to requests exceeding 200k input tokens.
- Fine-grained tool streaming no longer requires a beta header on any model or platform.