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Imagine image API updates Auto quality. The quality parameter on grok-imagine-image-2.0 now accepts auto , and the default when quality is omitted has moved from medium to auto . Auto currently uses low for image generation and medium for image editing. Images are billed at the quality they are served at. Pass low or medium explicitly to pin a specific quality. See Image Generation . Five reference images. Image editing now accepts up to 5 source images per request (was 3). See Multi-Image Editing . New aspect ratios. Image generation and editing accept 21:9 (cinematic widescreen) and 5:2 (wide banners). See Image Generation . August 12
Action requiredReview affected integrations and migrate before the documented retirement boundary.
Grok 4.6 Grok 4.6, SpaceXAI's frontier model for coding, agentic tasks, and knowledge work, is now available on the xAI API. It has a 500k context window, text and image inputs with text-only output, and no text output limit. Pricing is $2 / $0.50 / $6 per 1M tokens (input / cached input / output) below 200k prompt tokens, and $4 / $1 / $12 above. Reasoning effort supports low, medium, high (default), and xhigh. See the Grok 4.6 overview and the announcement . August 11
Grok 4.5 Grok 4.5, SpaceXAI's model for coding, agentic tasks, and knowledge work, is now available on the xAI API. Priced at $2 / 1M input tokens and $6 / 1M output tokens, with configurable reasoning effort (low, medium, or high; default high). See the Grok 4.5 overview and the announcement .
Context Compaction The Context Compaction API is now available. You can shrink long conversations into a shorter context and reuse it in follow-up requests for lower cost, faster time-to-first-token, and sharper responses on long agent loops. For more details, see the Context Compaction docs .
Cost Tracking 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. For more details, see the Cost Tracking docs . Apr 28
Text-to-Speech is available The Text-to-Speech API is now generally available. Generate natural-sounding speech from text with Grok. For more details, check out the Text-to-Speech docs . Mar 15
Priority Processing You can now request higher scheduling priority per request by setting service_tier: "priority" on text inference endpoints (Chat Completions and Responses). The response's service_tier field reports the tier actually applied, and priority rates are billed only when priority is used. For more details, see the Priority Processing docs . June 10
Public URLs and Files API ↔ Imagine integration Public URLs for Files — turn any file in your Files API storage into a permanent, unauthenticated URL that anyone can open, embed, or share. Revocable at any time, or set an auto-expiry between 1 hour and 30 days. See the Public URLs docs . Reference stored files as Imagine inputs — substitute image_file_id , video_file_id , or reference_image_file_ids for URL inputs across every Imagine endpoint, with no need to re-upload bytes or make the file public. See Imagine → Files API Integration . Persist Imagine outputs to Files — set storage_options on any Imagine request to save the generated asset to your Files storage; pair with storage_options.public_url to publish a shareable link in one round trip. See Imagine → Files API Integration .
Smart Turn for Streaming STT The streaming Speech to Text API now supports Smart Turn end-of-turn detection. When enabled via the smart_turn query parameter, an ML model predicts whether the speaker has finished their thought at silence boundaries — reducing false endpointing during dictation, number sequences, and mid-sentence pauses. Use smart_turn_timeout to set a maximum silence fallback. For more details, see the Smart Turn docs . May 29
WebSocket Responses API Mode WebSocket Responses API mode is now available. Drive the Responses API over a single, long-lived WebSocket connection for lower end-to-end latency on tool-heavy agent workloads. For more details, see the WebSocket Mode docs . May 27
Custom Voices You can now clone a voice from a short audio clip and use it across the Text-to-Speech and Speech to Speech APIs. Create and manage your voice catalog from the xAI console. For more details, check out the Custom Voices docs and our blog post .
Files API TTL You can now set an expiration policy on uploaded files using expires_after or an explicit expires_at timestamp. Expired files are automatically deleted. For more details, see the Files API docs . Apr 23
Batch API JSONL file upload You can now create batches by uploading a JSONL file via the Files API. Supports all batch endpoints including chat, image, and video in a single file. Mar 10
Batch API is released Batch API is available for all customers. It enables efficient batch processing of multiple requests, providing a better experience for users who need to submit large volumes of requests at once.
Files API is generally available You can now upload files and use them in chat conversations with the Files API. For more details, check out our guide on Files .
New Tools Available Collections Search Tool : You can now search through uploaded knowledge bases (collections) in chat conversations via the API. For more details, check out the docs . Remote MCP Tools : You can now use tools from remote MCP servers in chat conversations via the API. For more details, check out the docs . Mixing client-side and server-side tools : You can now mix client-side and server-side tools in the same chat conversation. For more details, check out the docs .
Grok Bot Grok Bot is now available. Durable AI teammates that work on a persistent cloud computer, with messaging, approvals, connectors, and routines. See the Grok Bot overview and Get started .
Grok Build 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: Bash curl -fsSL https://x.ai/cli/install.sh | bash For more details, see the Grok Build docs . May 1
Tools are now generally available New agentic server-side tools including web_search , x_search , and code_execution are available. For more details, check out our guide on using Tools .
Grok Voice Think Fast 2.0 is available grok-voice-think-fast-2.0 is now available with Speech to Speech. grok-voice-latest will route to this model starting August 5, 2026. To get started, see the Speech to Speech docs . For more details, see our announcement . July 23
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