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openrouter-python-sdk-retry…/docs/sdks/chat/README.md
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# Chat
(*chat*)
## Overview
### Available Operations
* [send](#send) - Create a chat completion
## send
Sends a request for a model response for the given chat conversation. Supports both streaming and non-streaming modes.
### Example Usage
<!-- UsageSnippet language="python" operationID="sendChatCompletionRequest" method="post" path="/chat/completions" -->
```python
from openrouter import OpenRouter
import os
with OpenRouter(
api_key=os.getenv("OPENROUTER_API_KEY", ""),
) as open_router:
res = open_router.chat.send(messages=[], stream=False)
with res as event_stream:
for event in event_stream:
# handle event
print(event, flush=True)
```
### Parameters
| Parameter | Type | Required | Description |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `messages` | List[[components.Message](../../components/message.md)] | :heavy_check_mark: | N/A |
| `provider` | [OptionalNullable[components.ChatGenerationParamsProvider]](../../components/chatgenerationparamsprovider.md) | :heavy_minus_sign: | When multiple model providers are available, optionally indicate your routing preference. |
| `plugins` | List[[components.ChatGenerationParamsPluginUnion](../../components/chatgenerationparamspluginunion.md)] | :heavy_minus_sign: | Plugins you want to enable for this request, including their settings. |
| `route` | [OptionalNullable[components.Route]](../../components/route.md) | :heavy_minus_sign: | N/A |
| `user` | *Optional[str]* | :heavy_minus_sign: | N/A |
| `session_id` | *Optional[str]* | :heavy_minus_sign: | A unique identifier for grouping related requests (e.g., a conversation or agent workflow) for observability. If provided in both the request body and the x-session-id header, the body value takes precedence. Maximum of 128 characters. |
| `model` | *Optional[str]* | :heavy_minus_sign: | N/A |
| `models` | List[*str*] | :heavy_minus_sign: | N/A |
| `frequency_penalty` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `logit_bias` | Dict[str, *float*] | :heavy_minus_sign: | N/A |
| `logprobs` | *OptionalNullable[bool]* | :heavy_minus_sign: | N/A |
| `top_logprobs` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `max_completion_tokens` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `max_tokens` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `metadata` | Dict[str, *str*] | :heavy_minus_sign: | N/A |
| `presence_penalty` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `reasoning` | [Optional[components.Reasoning]](../../components/reasoning.md) | :heavy_minus_sign: | N/A |
| `response_format` | [Optional[components.ChatGenerationParamsResponseFormatUnion]](../../components/chatgenerationparamsresponseformatunion.md) | :heavy_minus_sign: | N/A |
| `seed` | *OptionalNullable[int]* | :heavy_minus_sign: | N/A |
| `stop` | [OptionalNullable[components.ChatGenerationParamsStop]](../../components/chatgenerationparamsstop.md) | :heavy_minus_sign: | N/A |
| `stream` | *Optional[bool]* | :heavy_minus_sign: | N/A |
| `stream_options` | [OptionalNullable[components.ChatStreamOptions]](../../components/chatstreamoptions.md) | :heavy_minus_sign: | N/A |
| `temperature` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `tool_choice` | *Optional[Any]* | :heavy_minus_sign: | N/A |
| `tools` | List[[components.ToolDefinitionJSON](../../components/tooldefinitionjson.md)] | :heavy_minus_sign: | N/A |
| `top_p` | *OptionalNullable[float]* | :heavy_minus_sign: | N/A |
| `debug` | [Optional[components.Debug]](../../components/debug.md) | :heavy_minus_sign: | N/A |
| `retries` | [Optional[utils.RetryConfig]](../../models/utils/retryconfig.md) | :heavy_minus_sign: | Configuration to override the default retry behavior of the client. |
### Response
**[operations.SendChatCompletionRequestResponse](../../operations/sendchatcompletionrequestresponse.md)**
### Errors
| Error Type | Status Code | Content Type |
| ----------------------------- | ----------------------------- | ----------------------------- |
| errors.ChatError | 400, 401, 429 | application/json |
| errors.ChatError | 500 | application/json |
| errors.OpenRouterDefaultError | 4XX, 5XX | \*/\* |