TUI not rendering LLM response in tmux (opentui rendering bug, v1.2.21) #16566

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1. github-actions

   assigned

   kommander

   on Mar 8, 2026
2. github-actions

   added

   opentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui

   on Mar 8, 2026
3. github-actions commented on Mar 8, 2026

   

   github-actionsBot

   on Mar 8, 2026 – with GitHub Actions

   Contributor

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

   • TUI broken in tmux after 1.2.17 (found root cause) #16351: TUI broken in tmux after 1.2.17 — very similar symptoms (TUI rendering fails in tmux, same version range, same component), with a root cause identified and a workaround mentioned.
4. kimnamwook1 commented on Mar 8, 2026

   

   kimnamwook1

   on Mar 8, 2026

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   Same issue on macOS — native Terminal.app (no tmux)

   Reproducing the exact same behavior on macOS (Darwin 25.3.0) with OpenCode v1.2.21, but without tmux — running directly in Terminal.app and iTerm2.

   Environment

   • OS: macOS (Darwin 25.3.0, arm64)
   • OpenCode version: 1.2.21 (~/.opencode/bin/opencode)
   • Terminal: Terminal.app, iTerm2, and cmux — all reproduce
   • Models tested: openai/gpt-5.2, google/gemini-3.1-pro-preview, google/gemini-3-pro-preview
   • Plugins tested: oh-my-opencode, and also with no plugins at all — same result

   Key findings

   1. Backend completes normally — logs show full message.part.delta streaming, exiting loop, then cancel (cleanup)
   2. TUI never renders the response — UI shows ▣ Build · gpt-5.2 but body stays blank, Context shows 0 tokens, 0% used, $0.00 spent
   3. Response exists in DB — verified via sqlite3:

      sqlite3 ~/.local/share/opencode/opencode.db "SELECT substr(data, 1, 300) FROM part WHERE message_id = '...';"
      

      Returns full response with type: "text" content.
   4. Share link renders correctly — shared session shows the response in browser
   5. Desktop app works fine — same config, same model, response renders properly
   6. Not model-specific — tested with OpenAI (gpt-5.2, variant none/high) and Google (gemini-3.1-pro-preview) — all same behavior
   7. Not plugin-related — reproduced with "plugin": [] in opencode.json
   8. Issue exists since first install — never worked in TUI on this machine

   Log evidence

   INFO  service=llm providerID=openai modelID=gpt-5.2 agent=build mode=primary stream
   INFO  service=bus type=message.part.delta publishing    ← hundreds of deltas
   INFO  service=session.prompt step=1 sessionID=ses_xxx loop
   INFO  service=session.prompt sessionID=ses_xxx exiting loop
   INFO  service=session.prompt sessionID=ses_xxx cancel
   INFO  service=bus type=session.idle publishing
   

   DB proof

   {"type":"text","text":"Hey — what are you working on today? If you share a repo path or goal (bug, feature, refactor, tests), I'll take it from there."}

   Conclusion

   This is not tmux-specific. The opentui rendering layer fails to display streamed responses on macOS across multiple terminal emulators. The backend + DB + share links all work correctly — only the TUI rendering is broken.

   👍React with 👍5Reacted by Tyler, Tino Marques, Jan Drlý, Justin and Bjarne Schindler
5. kommander commented on Mar 8, 2026

   

   kommander

   on Mar 8, 2026

   Contributor

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   I can't seem to be able to reproduce the issue of responses not being rendered. Can anyone with that issue check the console? ctrl+p + "Toggle Console", are there any errors?
6. xybschin commented on Mar 26, 2026

   

   xybschin

   on Mar 26, 2026

   Last edited by xybschin

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   I can't seem to be able to reproduce the issue of responses not being rendered. Can anyone with that issue check the console? ctrl+p + "Toggle Console", are there any errors?

   I do have the same error with the latest opencode build but the console isn't updated neither after I send the prompt, so it does not show any errors.

   When running opencode --print-logs and entering a promt, this error shows:

   
7. dancoto commented on Mar 27, 2026

   

   dancoto

   on Mar 27, 2026

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   I am seeing the same issue in version 1.3.3.
8. xybschin commented on Apr 15, 2026

   

   xybschin

   on Apr 15, 2026

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   For me, this is no longer an issue with 1,4.6.
9. kommander

   closed this as completedon Apr 16, 2026