OpenAI API / OpenAI API

OpenAI Batch API Returns 404 'model_not_found' for GPT-5.x Models

Fix OpenAI Batch API 404 error when using GPT-5.x models Includes evidence for OpenAI API troubleshooting demand.

Source-backed Last updated May 14, 2026 1 source Needs local verification

Category: OpenAI API
Error signature: OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 14, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for OpenAI API, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch is a OpenAI API failure pattern reported for developers trying to fix openai batch api 404 error when using gpt-5.x models. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

OpenAI Batch API returns 404 with model_not_found for gpt-5-mini-2025-08-07-batch. Users confirm token has access to GPT-5-mini. /v1/responses works but /v1/chat/completions batch fails. OpenAI docs list GPT-5.x as supporting batch API.

Common causes

The Batch API automatically appends -batch suffix to model names, but GPT-5.x batch variants do not exist. This breaks batch processing workflows for developers who upgraded from GPT-4.x to GPT-5.x. The /v1/responses endpoint works fine, only /v1/chat/completions batch is affected.
OpenAI Batch API returns 404 with model_not_found for gpt-5-mini-2025-08-07-batch. Users confirm token has access to GPT-5-mini. /v1/responses works but /v1/chat/completions batch fails. OpenAI docs list GPT-5.x as supporting batch API.

Quick fixes

Confirm the exact error signature matches OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch.
Check the OpenAI API account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch exactly before applying the quick fix.
Compare the failing environment with OpenAI API versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch mean in OpenAI API?

OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch indicates the workflow described by "OpenAI Batch API Returns 404 'model_not_found' for GPT-5.x Models" failed in a OpenAI API context. Start by confirming the exact signature and the component that emitted it.

What should I check first for OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch?

Check whether this cause matches your environment: The Batch API automatically appends -batch suffix to model names, but GPT-5.x batch variants do not exist. This breaks batch processing workflows for developers who upgraded from GPT-4.x to GPT-5.x. The /v1/responses endpoint works fine, only /v1/chat/completions batch is affected.

Is the OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch guidance source-backed?

The "OpenAI Batch API Returns 404 'model_not_found' for GPT-5.x Models" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch?

For "OpenAI Batch API Returns 404 'model_not_found' for GPT-5.x Models", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging OpenAI Batch API returns 404 with GPT-5.x models: model_not_found gpt-5-mini-2025-08-07-batch?

For "OpenAI Batch API Returns 404 'model_not_found' for GPT-5.x Models", collect the failing OpenAI API command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.