Older models did show the full unredacted thinking trace, but I don't think Opus has ever shown full CoT. Here is an archived version of Anthropic's API docs s

Older models did show the full unredacted thinking trace, but I don't think Opus has ever shown full CoT. Here is an archived version of Anthropic's API docs saying that Sonnet 3.7 (only) has unredacted CoT on API: https://web.archive.org/web/20260324051339/https://platform.claude.com/docs/en/build-with-claude/extended-thinking#summarized-thinking https://web.archive.org/web/20260324051339/https://platform....