Release Notes

xAI's fast coding model trained specifically for agentic coding, currently in early access. The model slug is grok-build-0.1.

Grok Build is now available in beta. Use the interactive TUI, run headlessly in scripts, or build apps and orchestrators with the Agent Client Protocol.

Install with a single command:

curl -fsSL https://x.ai/cli/install.sh | bash

You can now clone a voice from a short audio clip and use it across the Text-to-Speech and Voice Agent APIs. Create and manage your voice catalog from the xAI console.

Every API response now includes the exact cost of the request via a cost_in_usd_ticks field in the usage object. Works across chat completions, Responses API, image generation, video generation, and streaming.

You can now set an expiration policy on uploaded files using expires_after or an explicit expires_at timestamp. Expired files are automatically deleted.

You can now use grok-voice-think-fast-1.0 with the Voice Agent API. See the blog post for more details.

The xAI Speech to Text API is now generally available. Transcribe audio to text in 25 languages with batch and streaming modes.

The Text-to-Speech API is now generally available. Generate natural-sounding speech from text with Grok.

The Batch API now supports image generation, image editing, and video generation in addition to chat completions. Both server-side tools and client-side function tools are also now supported in batch requests. Image and video URLs in batch results expire after 1 hour.

Enterprise customers can now purchase dedicated API capacity with guaranteed tokens per minute.

Grok 4.20 and Grok 4.20 Multi-agent models are now live. See the Multi-agent docs for details on the multi-agent variant.

Video Generation and a revamped Image Generation are now available via the API.

Grok Voice Agent API is generally available.

• You can now use Grok 4.1 Fast models with the agent tools.
• The price of agent tools drops by up to 50% to no more than $5 per 1000 successful calls.

You can now use Grok 4.1 Fast in the xAI Enterprise API. See the blog post for more details.

The stateful Responses API is now generally available to process requests.

You can upload files, create embeddings, and use them for inference with the Collections API.

Grok 4 is now available via the API or on https://grok.com.

You can manage your API keys via the Management API at https://management-api.x.ai.

Live search is now available on the API. Users can generate completions with queries on supported data sources.