Ultra sends reasoning.effort=max, but backend rejects max.
Open 💬 2 comments Opened Jun 29, 2026 by ichaer
What version of Codex CLI is running?
codex-cli 0.142.4
What subscription do you have?
Corporate
Which model were you using?
gpt-5.6-sol
What platform is your computer?
Linux 6.17.0-35-generic x86_64 x86_64
What terminal emulator and version are you using (if applicable)?
QTerminal 1.4.0
Codex doctor report
{
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"summary": "running npm on linux-x86_64",
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"install method": "npm (package /usr/local/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin /usr/local/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources /usr/local/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path /usr/local/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
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"sandbox.helpers": {
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"details": {
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"details": {
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"status": "ok",
"summary": "OS language en-US",
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"updates.status": {
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"last checked at": "2026-06-29T13:51:56.089630302Z",
"latest version": "0.142.4",
"latest version status": "current version is not older",
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}
}What issue are you seeing?
The /model command gives me the option ultra for reasoning effort on gpt-5.6-sol, but when I select that I get the following error:
{
"type": "error",
"error": {
"type": "invalid_request_error",
"code": "invalid_value",
"message": "Invalid value: 'max'. Supported values are: 'none', 'minimal', 'low', 'medium', 'high', and 'xhigh'.",
"param": "reasoning.effort"
},
"status": 400
}What steps can reproduce the bug?
Uploaded thread: 019f13a6-ac12-7e53-bd0e-0ebd0211a554
What is the expected behavior?
When I select ultra, I'd like to see no errors and the model using the effort level selected.
Additional information
_No response_
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