openai / openai/codex

Invalid prompt: your prompt was flagged as potentially violating our usage policy. Please try again with a different prompt: https://platform.openai.com/docs/guides/reasoning#advice-on-prompting

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bug CLI model-behavior
Dominant language
Rust
Stars
125k
Forks
19.4k
PR merge metrics
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Description

What version of Codex CLI is running?

v0.153.4

What subscription do you have?

offica

Which model were you using?

gpt-6-astra

What platform is your computer?

linux

What terminal emulator and version are you using (if applicable)?

bash

Codex doctor report

What issue are you seeing?

Invalid prompt: your prompt was flagged as potentially violating our usage policy. Please try again with a different prompt:
https://platform.openai.com/docs/guides/reasoning#advice-on-prompting

It was working perfectly fine this morning. This issue started in the afternoon after a context compression, and it has been happening for quite a while now.

Even if I start a new chat, the same issue still occurs. Switching to GPT-5.6 Sol works fine.

What steps can reproduce the bug?

new session and send hi

What is the expected behavior?

No response

Additional information

thread ID 01a0745d-f3ee-7d22-a7a7-c0b54d581cf0

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file or test is named in the report. Start by reproducing the failure in a new Codex CLI session on Linux with Bash using v0.153.4 and the reported model, then compare it with the model that works. Done means identifying and correcting the cause of valid prompts being rejected, with a regression test for the reported behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
cli
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
38/100

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