xAI Opens Grok 3 and Grok 3 Mini API Access with Function Calling

xAI made Grok 3 and Grok 3 Mini available to developers through its public API with support for function calling, structured JSON output, and system prompt configuration. Grok 3 Mini includes a configurable reasoning effort parameter analogous to Anthropic's thinking budget. Pricing is set at $3 per million input tokens and $15 per million output tokens for Grok 3, with Mini at $0.30 and $0.50 respectively.