x.ai · Model APIs
SpaceXSI (formerly xAI) API for Grok models with chat, reasoning, vision and function calling, compatible with common SDKs. Keys and the Console Playground are free; API calls use prepaid credits, with grok-4.7 at $2 per million input and $6 per million output tokens.
xAI API is one of 6 model API tools on Intelsi. See all model API tools or how we check facts.
// guides
Is Anthropic API free? Keys are free and new users get a small test credit, but Claude API calls are prepaid per token. Prices, plan credits, student options.
Is the xAI API free? Keys and the Playground are free, but Grok API calls use prepaid credits. Current xAI API prices, rate limits and how to get started.
What is an LLM API key? A plain English guide to API keys for OpenAI, Claude, Gemini and Grok: how they work, how billing attaches and how to keep one safe.
Compare free OpenAI API alternatives in 2026: Google AI Studio's free Gemini API, Anthropic signup credits, xAI's free Playground, and OpenAI's own free options.
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