---
title: "AzureOpenAIResponsesChatGenerator"
id: azureopenairesponseschatgenerator
slug: "/azureopenairesponseschatgenerator"
description: "This component enables chat completion using OpenAI's Responses API through Azure services with support for reasoning models."
---

# AzureOpenAIResponsesChatGenerator

This component enables chat completion using OpenAI's Responses API through Azure services with support for reasoning models.

<div className="key-value-table">

|  |  |
| --- | --- |
| **Most common position in a pipeline** | After a [`ChatPromptBuilder`](../builders/chatpromptbuilder.mdx) |
| **Mandatory init variables** | `api_key`: The Azure OpenAI API key. Can be set with `AZURE_OPENAI_API_KEY` env var or a callable for Azure AD token.  <br /> <br />`azure_endpoint`: The endpoint of the deployed model. Can be set with `AZURE_OPENAI_ENDPOINT` env var. |
| **Mandatory run variables** | `messages`: A list of [`ChatMessage`](../../concepts/data-classes/chatmessage.mdx)  objects representing the chat |
| **Output variables** | `replies`: A list of [`ChatMessage`](../../concepts/data-classes/chatmessage.mdx) objects containing the generated responses |
| **API reference** | [Generators](/reference/generators-api) |
| **GitHub link** | https://github.com/deepset-ai/haystack/blob/main/haystack/components/generators/chat/azure_responses.py |

</div>

## Overview

`AzureOpenAIResponsesChatGenerator` uses OpenAI's Responses API through Azure OpenAI services. It supports gpt-5 and o-series models (reasoning models like o1, o3-mini) deployed on Azure. The default model is `gpt-5-mini`.

The Responses API is designed for reasoning-capable models and supports features like reasoning summaries, multi-turn conversations with previous response IDs, and structured outputs. This component provides access to these capabilities through Azure's infrastructure.

The component requires a list of `ChatMessage` objects to operate. `ChatMessage` is a data class that contains a message, a role (who generated the message, such as `user`, `assistant`, `system`), and optional metadata. See the [usage](#usage) section for examples.

You can pass any parameters valid for the OpenAI Responses API directly to `AzureOpenAIResponsesChatGenerator` using the `generation_kwargs` parameter, both at initialization and to the `run()` method. For more details on the supported parameters, refer to the [Azure OpenAI documentation](https://learn.microsoft.com/en-us/azure/ai-services/openai/reference).

You can specify a model for this component through the `azure_deployment` init parameter, which should match your Azure deployment name.

### Authentication

To work with Azure components, you need an Azure OpenAI API key and an Azure OpenAI endpoint. You can learn more about them in the [Azure documentation](https://learn.microsoft.com/en-us/azure/ai-services/openai/reference).

The component uses `AZURE_OPENAI_API_KEY` and `AZURE_OPENAI_ENDPOINT` environment variables by default. Otherwise, you can pass these at initialization using a [`Secret`](../../concepts/secret-management.mdx):

```python
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.utils import Secret

client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    api_key=Secret.from_token("<your-api-key>"),
    azure_deployment="gpt-5-mini",
)
```

For Azure Active Directory authentication, you can pass a callable that returns a token:

```python
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator


def get_azure_ad_token():
    # Your Azure AD token retrieval logic
    return "your-azure-ad-token"


client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    api_key=get_azure_ad_token,
    azure_deployment="gpt-5-mini",
)
```

### Reasoning Support

One of the key features of the Responses API is support for reasoning models. You can configure reasoning behavior using the `reasoning` parameter in `generation_kwargs`:

```python
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage

client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    generation_kwargs={"reasoning": {"effort": "medium", "summary": "auto"}},
)

messages = [
    ChatMessage.from_user(
        "What's the most efficient sorting algorithm for nearly sorted data?",
    ),
]
response = client.run(messages)
print(response)
```

The `reasoning` parameter accepts:
- `effort`: Level of reasoning effort - `"low"`, `"medium"`, or `"high"`
- `summary`: How to generate reasoning summaries - `"auto"` or `"generate_summary": True/False`

:::note
OpenAI does not return the actual reasoning tokens, but you can view the summary if enabled. For more details, see the [OpenAI Reasoning documentation](https://platform.openai.com/docs/guides/reasoning).
:::

### Multi-turn Conversations

The Responses API supports multi-turn conversations using `previous_response_id`. You can pass the response ID from a previous turn to maintain conversation context:

```python
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage

client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
)

# First turn
messages = [ChatMessage.from_user("What's quantum computing?")]
response = client.run(messages)
response_id = response["replies"][0].meta.get("id")

# Second turn - reference previous response
messages = [ChatMessage.from_user("Can you explain that in simpler terms?")]
response = client.run(messages, generation_kwargs={"previous_response_id": response_id})
```

### Structured Output

`AzureOpenAIResponsesChatGenerator` supports structured output generation through the `text_format` and `text` parameters in `generation_kwargs`:

- **`text_format`**: Pass a Pydantic model to define the structure
- **`text`**: Pass a JSON schema directly

**Using a Pydantic model**:

```python
from pydantic import BaseModel
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage


class ProductInfo(BaseModel):
    name: str
    price: float
    category: str
    in_stock: bool


client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    azure_deployment="gpt-4o",
    generation_kwargs={"text_format": ProductInfo},
)

response = client.run(
    messages=[
        ChatMessage.from_user(
            "Extract product info: 'Wireless Mouse, $29.99, Electronics, Available in stock'",
        ),
    ],
)
print(response["replies"][0].text)
```

**Using a JSON schema**:

```python
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage

json_schema = {
    "format": {
        "type": "json_schema",
        "name": "ProductInfo",
        "strict": True,
        "schema": {
            "type": "object",
            "properties": {
                "name": {"type": "string"},
                "price": {"type": "number"},
                "category": {"type": "string"},
                "in_stock": {"type": "boolean"},
            },
            "required": ["name", "price", "category", "in_stock"],
            "additionalProperties": False,
        },
    },
}

client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    azure_deployment="gpt-4o",
    generation_kwargs={"text": json_schema},
)

response = client.run(
    messages=[
        ChatMessage.from_user(
            "Extract product info: 'Wireless Mouse, $29.99, Electronics, Available in stock'",
        ),
    ],
)
print(response["replies"][0].text)
```

:::info[Model Compatibility and Limitations]
- Both Pydantic models and JSON schemas are supported for latest models starting from GPT-4o.
- If both `text_format` and `text` are provided, `text_format` takes precedence and the JSON schema passed to `text` is ignored.
- Streaming is not supported when using structured outputs.
- Older models only support basic JSON mode through `{"type": "json_object"}`. For details, see [OpenAI JSON mode documentation](https://platform.openai.com/docs/guides/structured-outputs#json-mode).
- For complete information, check the [Azure OpenAI Structured Outputs documentation](https://learn.microsoft.com/en-us/azure/ai-services/openai/how-to/structured-outputs).
:::

### Tool Support

`AzureOpenAIResponsesChatGenerator` supports function calling through the `tools` parameter. It accepts flexible tool configurations:

- **Haystack Tool objects and Toolsets**: Pass Haystack `Tool` objects or `Toolset` objects, including mixed lists of both
- **OpenAI/MCP tool definitions**: Pass pre-defined OpenAI or MCP tool definitions as dictionaries

Note that you cannot mix Haystack tools and OpenAI/MCP tools in the same call - choose one format or the other.

```python
from haystack.tools import Tool
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage


def get_weather(city: str) -> str:
    """Get weather information for a city."""
    return f"Weather in {city}: Sunny, 22°C"


weather_tool = Tool(
    name="get_weather",
    description="Get current weather for a city",
    function=get_weather,
    parameters={"type": "object", "properties": {"city": {"type": "string"}}},
)

generator = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    tools=[weather_tool],
)
messages = [ChatMessage.from_user("What's the weather in Paris?")]
response = generator.run(messages)
```

You can control strict schema adherence with the `tools_strict` parameter. When set to `True` (default is `False`), the model will follow the tool schema exactly. Note that the Responses API has its own strictness enforcement mechanisms independent of this parameter.

For more details on working with tools, see the [Tool](../../tools/tool.mdx) and [Toolset](../../tools/toolset.mdx) documentation.

### Streaming

You can stream output as it's generated. Pass a callback to `streaming_callback`. Use the built-in `print_streaming_chunk` to print text tokens and tool events (tool calls and tool results).

```python
from haystack.components.generators.utils import print_streaming_chunk

## Configure any `Generator` or `ChatGenerator` with a streaming callback
component = SomeGeneratorOrChatGenerator(streaming_callback=print_streaming_chunk)

## If this is a `ChatGenerator`, pass a list of messages:
## from haystack.dataclasses import ChatMessage
## component.run([ChatMessage.from_user("Your question here")])

## If this is a (non-chat) `Generator`, pass a prompt:
## component.run({"prompt": "Your prompt here"})
```

:::info
Streaming works only with a single response. If a provider supports multiple candidates, set `n=1`.
:::

See our [Streaming Support](guides-to-generators/choosing-the-right-generator.mdx#streaming-support) docs to learn more how `StreamingChunk` works and how to write a custom callback.

Give preference to `print_streaming_chunk` by default. Write a custom callback only if you need a specific transport (for example, SSE/WebSocket) or custom UI formatting.

## Usage

### On its own

Here is an example of using `AzureOpenAIResponsesChatGenerator` independently with reasoning and streaming:

```python
from haystack.dataclasses import ChatMessage
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.components.generators.utils import print_streaming_chunk

client = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    streaming_callback=print_streaming_chunk,
    generation_kwargs={"reasoning": {"effort": "high", "summary": "auto"}},
)
response = client.run(
    [
        ChatMessage.from_user(
            "Solve this logic puzzle: If all roses are flowers and some flowers fade quickly, can we conclude that some roses fade quickly?",
        ),
    ],
)
print(response["replies"][0].reasoning)  # Access reasoning summary if available
```

### In a pipeline

This example shows a pipeline that uses `ChatPromptBuilder` to create dynamic prompts and `AzureOpenAIResponsesChatGenerator` with reasoning enabled to generate explanations of complex topics:

```python
from haystack.components.builders import ChatPromptBuilder
from haystack.components.generators.chat import AzureOpenAIResponsesChatGenerator
from haystack.dataclasses import ChatMessage
from haystack import Pipeline

prompt_builder = ChatPromptBuilder()
llm = AzureOpenAIResponsesChatGenerator(
    azure_endpoint="https://your-resource.azure.openai.com/",
    generation_kwargs={"reasoning": {"effort": "low", "summary": "auto"}},
)

pipe = Pipeline()
pipe.add_component("prompt_builder", prompt_builder)
pipe.add_component("llm", llm)
pipe.connect("prompt_builder.prompt", "llm.messages")

topic = "quantum computing"
messages = [
    ChatMessage.from_system(
        "You are a helpful assistant that explains complex topics clearly.",
    ),
    ChatMessage.from_user("Explain {{topic}} in simple terms"),
]
result = pipe.run(
    data={
        "prompt_builder": {
            "template_variables": {"topic": topic},
            "template": messages,
        },
    },
)
print(result)
```