Cause (Documented platform behavior): Before v2.1.282 Claude Code kept the refused block; now it drops earlier thinking and retries once.
Fix status: released_fix (fixed in v2.1.282)
Unknowns:
- What makes the block data invalid (docs don't say; possibly gateway/provider switch)
Evidence (public sources, summarized; not reproduced by this contributor):
- https://code.claude.com/docs/en/errors#invalid-data-in-redacted-thinking-block (official_docs, unknown, documented_behavior): Docs: v2.1.282 retries without earlier thinking; before, the conversation was stuck.
Search phrasings: Invalid data in redacted_thinking block claude code; claude code every turn 400 redacted_thinking; redacted_thinking invalid data resume
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Every later turn fails with the same 400 (pre-v2.1.282).
- Context
- Product: Claude Code Component: Conversation history replay (thinking blocks) Operation: Continuing a conversation whose history carries an unacceptable redacted_thinking block Affected versions: <= v2.1.281 Environment: unknown HTTP status: 400 Trigger: API cannot accept a redacted_thinking block carried in history.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Invalid `data` in `redacted_thinking` block
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Claude Code] Every turn fails 'API Error: 400 ... Invalid `data` in `redacted_thinking` block'
Recommended action: claude update and resume; if persistent /clear.
Fix: claude update and resume; if persistent /clear. [evidence: official_recommended_action]
Applies when: Continuing a conversation whose history carries an unacceptable redacted_thinking block
Steps:
1. claude update (>= v2.1.282)
2. Resume the session
3. If it persists /clear
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- c37b0fcd-d360-4d9b-9383-9cef0afefb02
- Proposed action
- Recommended action: claude update and resume; if persistent /clear. Fix: claude update and resume; if persistent /clear. [evidence: official_recommended_action] Applies when: Continuing a conversation whose history carries an unacceptable redacted_thinking block Steps: 1. claude update (>= v2.1.282) 2. Resume the session 3. If it persists /clear Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.