Issues sending Azure OAI Batches

Question

We're attempting to configure Azure OpenAI batch handler.

I uploaded a test JSONL with one line (lifted from Azure OAI template https://learn.microsoft.com/en-us/azure/ai-foundry/openai/how-to/batch?view=foundry-classic&tabs=global-batch%2Cstandard-input%2Cpython-secure&pivots=ai-foundry-portal)

{"custom_id": "task-0", "method": "POST", "url": "/v1/chat/completions", "body": {"model": "gpt-5-mini", "messages": [{"role": "system", "content": "You are an AI assistant that helps people find information."}, {"role": "user", "content": "When was Microsoft founded?"}]}}

I've deployed a model with the name 'gpt-5-mini' and keep getting the following error:

Unable to create batch job Request failed with status code 400. Trace ID : 5bd78daf-c6c7-45ed-8879-26876c283ee6Client request ID : dedf148b-1ed1-44c6-8f72-d3637045dcfeAPIM request ID : 5d045a6e-de3b-4908-87f9-56950492928c

Can you assist? Not sure what I'm missing here.

Answer 1

Hello John Kronlokken,

I see you are encountering a 400 Bad Request error when attempting to create a batch job for the gpt-5-mini model.

Here is the workaround step to fix it: Correct the JSONL model Field vs. Deployment Name

In Azure OpenAI Batch, the model field inside your JSONL file is not the generic model's name (e.g., "gpt-5-mini"). It must match your Deployment Name exactly.

Scenario: You deployed the model gpt-5-mini, but did you also name the deployment gpt-5-mini?

• Example: If you named your deployment my-gpt5-test, but your JSONL says "model": "gpt-5-mini", the batch job will fail validation with a 400 error.
• Fix: Ensure the value in your JSONL matches your deployment name in Azure AI Foundry exactly (case-sensitive).

// If your Deployment Name is "my-gpt5-deployment":
"body": {"model": "my-gpt5-deployment", "messages": ...}

Above screenshot reference is from the link you shared; https://learn.microsoft.com/en-us/azure/ai-foundry/openai/how-to/batch?view=foundry-classic&tabs=global-batch%2Cstandard-input%2Cpython-secure&pivots=ai-foundry-portal

Official Microsoft Documentation References:

• Azure OpenAI Batch: Create a batch job (REST API)
• Foundry Models: GPT-5 series capabilities

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I hope this helps in providing a way ahead. Kindly "Accept the answer and upvote" to support the community members for similar remediation.