Gemini does not work with agents sdk

[kmariunas]

Describe the question

Trying to run gemini model for a triage agent, but i get this error, because instead of an actual id for an event, it uses _fake_id
openai.BadRequestError: Error code: 400 - {'error': {'message': "Invalid 'input[1].id': '__fake_id__'. Expected an ID that begins with 'msg'.", 'type': 'invalid_request_error', 'param': 'input[1].id', 'code': 'invalid_value'}}

Debug information

• Agents SDK version: (e.g. v0.0.4)
• Python version (e.g. Python 3.12.8)

Repro steps

gemini = AsyncOpenAI(
        api_key="KEY",
        base_url="https://generativelanguage.googleapis.com/v1beta/openai/"
    )
agent = Agent(
            name=self.agent_name,
            instructions=f"{RECOMMENDED_PROMPT_PREFIX}}",
            handoffs=handoffs,
            model=OpenAIChatCompletionsModel(model="gemini-2.0-flash-001", openai_client=gemini)
)
Runner.run_streamed(agent, "Hi!")

Expected behavior

Runs normally