xAI's API platform providing access to Grok models through an OpenAI-compatible endpoint: text, agentic coding, voice, and image and video generation.
The xAI API is xAI's developer platform through which the Grok family of models is served. The API base URL is https://api.x.ai/v1, with Bearer token authentication typically supplied through the XAI_API_KEY environment variable. The platform is compatible with OpenAI clients — pointing a standard client at xAI's base URL is enough to use Grok models without changing code.
The platform is organized into five main services: the Responses API for generating text, holding conversations and building tool-using applications; the Code API for agentic coding on grok-4.7; the Voice API for speech synthesis and transcription; and the Imagine API in two variants — for image generation and editing, and for video generation and editing. Cross-cutting features are also available: function calling, web search, structured outputs and a Batch API for asynchronous processing.
The model catalogue spans text variants with context windows from 256K to 1M tokens — including grok-4.7, grok-4.6 and grok-4.5 (500K tokens, $2–4 per 1M input and $6–12 per 1M output), grok-4.3, and grok-4.20 variants in reasoning, non-reasoning and multi-agent flavours (1M tokens, $1.25–2.50 input and $2.50–5 output), plus grok-build-0.1. Specialized models are billed differently: image generation from $0.02 to $0.05 per image, video at $0.05–0.08 per second, and voice at $0.08 per minute of audio. The Grok 4.7 Fast variant is not available on the public API — it runs only in Cursor and Grok Build.
