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GPT 5.3 Codex Copilot #9149

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opened 2026-02-16 18:11:45 -05:00 by yindo · 6 comments
yindo commented 2026-02-16 18:11:45 -05:00
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Originally created by @ADYADY222 on GitHub (Feb 12, 2026).

Originally assigned to: @rekram1-node on GitHub.

Description

I'm trying to use the GPT 5.3 Codex model from Github and it says The requested model is not supported

Plugins

Opencode Extension V0.0.13

OpenCode version

1.1.60

Steps to reproduce

I selected GPT 5.3 Codex from /models and when I tried to send a message to see if it worked, it gave me the error The requested model is not supported, after which I logged out (opencode auth logout/login) and then logged in but it still did the same thing, including when I entered a new session it still said The requested model is not supported

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Image

Operating System

Windows 11

Terminal

Opencode CLI/Terminal

Originally created by @ADYADY222 on GitHub (Feb 12, 2026). Originally assigned to: @rekram1-node on GitHub. ### Description I'm trying to use the GPT 5.3 Codex model from Github and it says The requested model is not supported ### Plugins Opencode Extension V0.0.13 ### OpenCode version 1.1.60 ### Steps to reproduce I selected GPT 5.3 Codex from /models and when I tried to send a message to see if it worked, it gave me the error The requested model is not supported, after which I logged out (opencode auth logout/login) and then logged in but it still did the same thing, including when I entered a new session it still said The requested model is not supported ### Screenshot and/or share link <img width="454" height="299" alt="Image" src="https://github.com/user-attachments/assets/a8771de3-5edd-4ba0-afca-10782fa60b0f" /> ### Operating System Windows 11 ### Terminal Opencode CLI/Terminal
yindo added the bugneeds:compliance labels 2026-02-16 18:11:45 -05:00
yindo closed this issue 2026-02-16 18:11:45 -05:00
yindo commented 2026-02-16 18:11:45 -05:00
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@github-actions[bot] commented on GitHub (Feb 12, 2026):

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

  • Steps to reproduce: Required for bug reports but shows "No response" - please describe what you did when you encountered this error
  • Operating System: Required context to help debug model compatibility issues
  • Terminal: Required for context
  • Plugins: Please specify what plugins you have installed

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

Potential duplicates found: This issue might be related to existing GitHub Copilot + GPT-5.3-Codex support issues:

  • #12789: "The requested model is not supported." with GitHub Copilot
  • #11473: Same error with Copilot settings context
  • #12839: "gpt-5.3-codex fails with 404 when authenticated via OpenAI API key"
  • #12570: "Responses using GPT-5.3-Codex (from OpenAI Codex) terminate early"

Please check these issues to see if they describe your problem, as this might be a known limitation rather than a new bug.

If you believe this was flagged incorrectly, please let a maintainer know.

@github-actions[bot] commented on GitHub (Feb 12, 2026): <!-- issue-compliance --> This issue doesn't fully meet our [contributing guidelines](../blob/dev/CONTRIBUTING.md). **What needs to be fixed:** - Steps to reproduce: Required for bug reports but shows "_No response_" - please describe what you did when you encountered this error - Operating System: Required context to help debug model compatibility issues - Terminal: Required for context - Plugins: Please specify what plugins you have installed Please edit this issue to address the above within **2 hours**, or it will be automatically closed. --- **Potential duplicates found:** This issue might be related to existing GitHub Copilot + GPT-5.3-Codex support issues: - #12789: "The requested model is not supported." with GitHub Copilot - #11473: Same error with Copilot settings context - #12839: "gpt-5.3-codex fails with 404 when authenticated via OpenAI API key" - #12570: "Responses using GPT-5.3-Codex (from OpenAI Codex) terminate early" Please check these issues to see if they describe your problem, as this might be a known limitation rather than a new bug. If you believe this was flagged incorrectly, please let a maintainer know.
yindo commented 2026-02-16 18:11:45 -05:00
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@muhammadsyaddad commented on GitHub (Feb 12, 2026):

i think the error is form the github itself not the opencode "code" , i put session log where i use gpt-5.3-codex model its return
""""
{"error":{"message":"The requested model is not supported.","code":"model_not_supported","param":"model","type":"invalid_request_error"}}
""""

ex.log

@muhammadsyaddad commented on GitHub (Feb 12, 2026): i think the error is form the github itself not the opencode "code" , i put session log where i use gpt-5.3-codex model its return """" {"error":{"message":"The requested model is not supported.","code":"model_not_supported","param":"model","type":"invalid_request_error"}} """" [ex.log](https://github.com/user-attachments/files/25253537/ex.log)
yindo commented 2026-02-16 18:11:45 -05:00
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@muhammadsyaddad commented on GitHub (Feb 12, 2026):

and also i found this
https://github.com/orgs/community/discussions/186787

Image
@muhammadsyaddad commented on GitHub (Feb 12, 2026): and also i found this https://github.com/orgs/community/discussions/186787 <img width="960" height="675" alt="Image" src="https://github.com/user-attachments/assets/b1a40062-738d-4cdc-b467-45b3bd4f6ee9" />
yindo commented 2026-02-16 18:11:45 -05:00
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@JReis23 commented on GitHub (Feb 12, 2026):

and also i found this https://github.com/orgs/community/discussions/186787
Image

I don't think this is the problem. I'm not able to use Codex 5.3 in opencode, but with the IDE (zed in my case) I can use it.

@JReis23 commented on GitHub (Feb 12, 2026): > and also i found this https://github.com/orgs/community/discussions/186787 > <img alt="Image" width="960" height="675" src="https://private-user-images.githubusercontent.com/108942629/548677923-b1a40062-738d-4cdc-b467-45b3bd4f6ee9.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NzA4ODE4NzEsIm5iZiI6MTc3MDg4MTU3MSwicGF0aCI6Ii8xMDg5NDI2MjkvNTQ4Njc3OTIzLWIxYTQwMDYyLTczOGQtNGNkYy1iNDY3LTQ1YjNiZDRmNmVlOS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjYwMjEyJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI2MDIxMlQwNzMyNTFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0wYjUyODhiNTgzZjRlMTk1MWI4NDBlNjcyZmJmNmYzNjExNjkwYmExZGQyNjY0MTNlNTYyMzdjNTA0NTA0MDg0JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.5MU3UaXfyaBEfov5REw_xgzYqMGsQJeZsCl7Jka-_m0"> I don't think this is the problem. I'm not able to use Codex 5.3 in opencode, but with the IDE (zed in my case) I can use it.
yindo commented 2026-02-16 18:11:45 -05:00
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@YuldShah commented on GitHub (Feb 12, 2026):

same issue here.

@YuldShah commented on GitHub (Feb 12, 2026): same issue here.
yindo commented 2026-02-16 18:11:45 -05:00
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@github-actions[bot] commented on GitHub (Feb 12, 2026):

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.

@github-actions[bot] commented on GitHub (Feb 12, 2026): This issue has been automatically closed because it was not updated to meet our [contributing guidelines](../blob/dev/CONTRIBUTING.md) within the 2-hour window. Feel free to open a new issue that follows our issue templates.
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Reference: anomalyco/opencode#9149
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