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Invalid signature in thinking block #48637
Description
Description
messages.1.content.0: Invalid signature in thinking block. The block is bound to a different conversation. Remove the block, or set thinking.block_binding.prefix_mismatch_behavior to "drop_block". That setting requires the thinking-binding-controls-2026-08-01 value in the anthropic-beta header. The system prompt differs from the one this block was created with.
This happened specially with claude models
Plugins
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OpenCode version
1.18.30
Steps to reproduce
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Operating System
OS/Desktop: Linux Lite 6.4 (Ubuntu 22.04.5 LTS Jammy) / XFCE
Terminal
Emulator: xfce4-terminal 0.8.10 (Xfce 4.16) - VTE 6800 Shell: GNU bash 5.1.16(1)-release - /bin/bash TERM: xterm-256color, COLORTERM=truecolor
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github-actions commentedon Sep 12, 2026
This issue might be a duplicate of existing issues. Please check:
signatureinthinkingblock, triggered during context compaction)If your issue occurs specifically during context compaction or long sessions, #39291 may already track it. Otherwise, adding steps to reproduce would help distinguish this as a separate issue.
thdxr commentedon Oct 11, 2026
Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (
opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.— from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊