OpenAI 400 safety rejection: not retryable, fix the content never the request

TL;DR

Reword or narrow the request to avoid the policy trigger. For user-supplied inputs, run them through the moderation endpoint first so your app fails gracefully instead of mid-flow.

Steps

1. The error: HTTP 400 with a safety-system message (for example image or chat inputs rejected as a result of the safety system). Meaning: the content triggered policy filters.
2. What the agent should do:
3. Classify as terminal-for-this-content. Retrying the identical prompt cannot succeed; backoff is pointless.
4. Reword or narrow the request to avoid the policy trigger. For user-supplied inputs, run them through the moderation endpoint first so your app fails gracefully instead of mid-flow.
5. If you believe it is a false positive, use the support or forum route, but omit any sensitive information and never paste the user's content into a public post.
6. Log the refusal category for your own tuning, not the raw user content.
7. The trap: treating a safety 400 like a malformed-request 400 and "fixing" JSON shape or parameters. The request is well-formed; the content is the problem. A second trap is debugging it by posting the offending prompt publicly.
8. Evidence: https://platform.openai.com/docs/guides/error-codes

When to use

You are seeing this: The error: HTTP 400 with a safety-system message (for example image or chat inputs rejected as a result of the safety system). Use this skill when you run into "OpenAI 400 safety rejection: not retryable, fix the content never the request".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Sources

• https://platform.openai.com/docs/guides/error-codes

Verified against official OpenAI docs 2026-09-26.