Grok 4.3

Grok 4.3 is xAI’s flagship model, released in May 2026 with a focus on agentic tool calling, instruction following, reasoning, and real-time information access through the X platform. With a 1,000,000-token context window — one of the largest available — Grok 4.3 excels at long-context tasks and maintains awareness of current events through its native integration with the X (formerly Twitter) platform.

The model is accessible through the xAI Responses API, which follows OpenAI-compatible patterns for tool use and structured output. Grok 4.3 is one of the few models in ContextHub with verified pricing data: $1.25 per million input tokens and $2.50 per million output tokens, with confirmed availability through xAI’s API platform.

For agent workflows, Grok 4.3’s strength in tool calling and long-context reasoning makes it suitable for research agents, real-time information retrieval, and tasks that benefit from up-to-the-minute knowledge. Its OpenAI-compatible API surface means teams already using OpenAI SDKs can integrate with minimal code changes. The model also offers a non-reasoning fast variant for latency-sensitive applications.

External Resources

Links to official provider documentation, SDK repositories, and community resources for Grok 4.3. Always verify model availability, pricing, and capability details against the primary provider sources.

• xAI Grok 4.3 model documentation — Official xAI model page for Grok 4.3 capability, context, and pricing verification.
• xAI Python SDK — GitHub SDK reference for xAI API integration and client usage.