Added:
- New details about Claude Opus 4.8: the `effort` parameter now defaults to `high` across all surfaces (Claude Code, Messages API); the minimum cacheable prompt length for prompt caching is lowered to 1,024 tokens (compared to Opus 4.7); and with adaptive thinking, reasoning triggers only when a turn needs it, reducing wasted thinking tokens versus Opus 4.7 at the same effort level.

Changed:
- The entire release notes list was restructured and moved from the top of the page to a lower position. All prior entries remain present and unchanged in content, but their order and location on the page have been rearranged.

Removed:
- The "Copy page" buttons and the introductory line "Updates to the Claude Platform, including the Claude API, client SDKs, and the Claude Console." that previously appeared at the top of the release notes section.