You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ThinkingArea: what it touches
Bug FixesKind: in v2.1.282,
Bug FixesSection of the release
What
Thinking is the reasoning the model does before it answers. Some of it can come back in hidden form, called a redacted_thinking block. When the API rejects a request with an error whose message contains "invalid data in redacted_thinking block", Claude Code now classes it as a thinking_signature error. That is the same category it already used for errors about bad or missing thinking signatures, and it goes through the same handling. This applies to everyone.
Why
A session that hits corrupted redacted thinking data should now be handled the same way as one that hits a signature error, instead of failing outright.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat Claude Code does after classing the error, such as removing the thinking and retrying, is not confirmed.
Anthropic's release notes agreeFixed sessions failing on every turn with an "Invalid data in redacted_thinking block" API error; Claude Code now drops the conversation's…
