codex - 💡(How to fix) Fix Compaction fails with - Unknown parameter: 'prompt_cache_retention'. [2 comments, 3 participants]

■ Error running remote compact task: { "error": {

TL;DR

The issue is likely due to an incompatible parameter 'prompt_cache_retention' being passed during the compact operation, and removing or updating this parameter may resolve the issue.

Guidance

• Verify the Codex CLI configuration and documentation to check if the 'prompt_cache_retention' parameter is supported in version 0.120.0.
• Check the GPT-5.4 model documentation to see if it has any specific requirements or limitations for compact operations.
• Try running the compact operation without the 'prompt_cache_retention' parameter to see if it succeeds.
• If the issue persists, consider reaching out to the Codex CLI support team for further assistance with the 'invalid_request_error'.

Notes

The provided information does not include the exact command used for the compact operation, so it is unclear how the 'prompt_cache_retention' parameter is being passed. Additionally, the Terminal.app emulator is mentioned, but it is unlikely to be the cause of the issue.

Recommendation

Apply workaround: Remove or update the 'prompt_cache_retention' parameter to a supported value, as the error message indicates that it is an unknown parameter.