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Can not send BinaryContent to "gpt-4.1-mini" on AzureOpenAI #2511

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@sugawarayss

Description

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Description

i facing issue about it is not working BinaryContent with AzureOpenAI "gpt-4.1-mini" model .

Agent.run have user_prompt string(written in japanese) and 9 image files (base64 encoded content).
gpt-4.1-mini model is not include BinaryContent in request_tokens like following Usage information.

does pydantic-ai not support "gpt-4.1-mini"? or my code is not something bad???

When i use "gpt-4o-mini" model

Usage(
 requests=1,
 request_tokens=78480,
 response_tokens=124,
 total_tokens=78604,
 details={'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0, 'cached_tokens': 0}
)

When i use "gpt-4.1-mini" model

Usage(
 requests=1,
 request_tokens=2889, # it is not include BinaryContent????
 response_tokens=17,
 total_tokens=2906,
 details={'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0, 'cached_tokens': 0}
)

Example Code

model = OpenAIModel(
 model_name=MY_AZURE_DEPLOYMENT_NAME, # deploy model:"gpt-4.1-mini" with model_ver: "2025-04-14"
 provider=AzureProvider(
 azure_endpoint=MY_AZURE_ENDPOINT,
 api_key=MY_AZURE_API_KEY,
 api_version=MY_AZURE_API_VERSION, # "2024-10-21"
)
my_agent = Agent(
 model=model,
 system_prompt=MY_SYSTEM_PROMPT,
 output_type=MyResultPydanticModel,
)
binary_contents: list[BinaryContent] = [BinaryContent(data=file.content, media_type=str(file.mime_type)) for file in params.files]
user_prompt = [
 USER_PROMPT_TEMPLATE,
 *binary_contents,
]
agent_run: AgentRunResult[Any] = await my_agent.run(user_prompt=user_prompt)
print(f"{agent_run.usage()}")

Python, Pydantic AI & LLM client version

Python: 3.13.1
Pydantic: 2.11.3
Pydantic-ai: 0.6.2
Model: gpt-4.1-mini(AzureOpenAI)

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