"Invalid request: the message at position 64 with role 'assistant' must not be empty" with Kimi K3 #37887

Activity

1. github-actions

   assigned

   kitlangton

   on Jul 20, 2026
2. github-actions

   added

   needs:complianceThis means the issue will auto-close after 2 hours.This means the issue will auto-close after 2 hours.

   on Jul 20, 2026
3. github-actions commented on Jul 20, 2026

   

   github-actionsBot

   on Jul 20, 2026 – with GitHub Actions

   Contributor

   More actions

   This issue doesn't fully meet our contributing guidelines.

   What needs to be fixed:

   • No issue template was used — please use the Bug Report template, which requires a Description field with real content, reproduction steps, and environment information (OS, opencode version, provider/model config)
   • The current content is a single line with no context on how to reproduce the issue or what environment it occurs in

   Please edit this issue to address the above within 2 hours, or it will be automatically closed.

   ---

   This issue might be a duplicate of existing issues. Please check:

   • Empty reasoning step (no delta) in replayed history causes 400 on later Kimi K3 requests #37651: Empty reasoning step (no delta) in replayed history causes 400 on later Kimi K3 requests — same error, same provider, same symptom of assistant message being empty

   If you believe this was flagged incorrectly, please let a maintainer know.
4. github-actions commented on Jul 20, 2026

   

   github-actionsBot

   on Jul 20, 2026 – with GitHub Actions

   Contributor

   More actions

   This issue has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

   Feel free to open a new issue that follows our issue templates.
5. github-actions

   removed

   needs:complianceThis means the issue will auto-close after 2 hours.This means the issue will auto-close after 2 hours.

   on Jul 20, 2026
6. github-actions

   closed this as not plannedon Jul 20, 2026
7. impptg commented on Aug 31, 2026

   

   impptg

   on Aug 31, 2026

   More actions

   For anyone landing here from search: this error means the replayed history contains an assistant message that serializes with empty content (typically from a mid-turn abort or empty streamed text parts with reasoning models like Kimi K3), and strict providers reject the whole request — bricking the session.

   Two fixes:

   • Temporary workaround: https://github.com/impptg/opencode-fix-empty-assistant-messages — an opencode plugin that sanitizes history via the experimental.chat.messages.transform hook before each request (drops empty text parts and reasoning-only step segments).
   • Permanent fix: fix(opencode): drop assistant turns without model-visible content from replay #45839 (pending review) filters these at conversion time in core, which also heals already-bricked sessions. Once it's released, remove the plugin.

   If your session is already bricked and you can't wait: clean the offending assistant rows in ~/.local/share/opencode/opencode.db (empty text parts / reasoning-only steps), then restart the client.