Docs

Create Chat Completion

Creates a chat completion in OpenRouter.

POST

Query

Field selectionChoose which fields should be included in the response. Learn more
string

Comma-separated response fields to include.

Body

Arguments
stringrequired

OpenRouter model identifier, for example openai/gpt-5.2.

array of objectrequired

Conversation messages sent to the chat completion endpoint.

stringrequired

Text content for the message.

Uncommon arguments
number

Sampling temperature.

number

Maximum number of completion tokens.

boolean

Whether to stream incremental tokens.

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