Creates a model response using the same interface as the OpenAI Create a model response API. Provide a text input string to generate text or JSON outputs. Supports non-streaming JSON and Server-Sent Events when stream=true.

Request – Requires model and input. All other request fields (tools, stream, temperature, instructions, and others) are provider-dependent — availability and semantics vary by the upstream provider selected via the model prefix. Consult that provider's documentation:

• OpenAI — Create a model response - Anthropic — Create a message - Google Gemini API - xAI — Create new response

model uses the provider/model identifier format (e.g. openai/gpt-4o-mini, anthropic/claude-sonnet-4-20250514, gemini/gemini-2.5-flash), consistent with other AI Gateway endpoints.

input – A string (shorthand for a user message).