Last updated · 90 releases tracked since November 2024
xAI and Grok updates, release notes and changelog entries covering Grok models, Grok Imagine, Grok Voice and the xAI API. Entries come from the official xAI API release notes, and each one is dated and linked to its source.
No xAI releases yet in October 2026. The last one, “safety_identifier request field”, landed on September 25, 2026.
This month
0
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Last 12 months
63
Busiest: May 2026
Most shipped
Developer Tools
20 releases
Newest first. Each entry links to the official page it came from.
You can now send safety_identifier, an opaque end-user identifier assigned by your application, on Chat Completions, the Responses API, deferred chat completions, the Batch API, and the gRPC GetCompletionsRequest . It lets SpaceXAI attribute a policy violation to one of your end…
Added safety_identifier request field for user attribution in API responses
Release of Grok 4.7 with 500k context window and new pricing tiers
Grok 4.7, SpaceXAI's frontier model for coding, agentic tasks, and knowledge work, is now available on the xAI API as grok-4.7 . 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 /…
grok-voice-transcribe-2.0 is now available. Use grok-voice-transcribe-1.0 or grok-voice-transcribe-2.0 ; the default is grok-voice-transcribe-2.0 .
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…
API updates for Imagine Image with auto quality, multiple reference images, and new aspect ratios
Release of Grok 4.6 with 500k context window and pricing details
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…
Launch of Grok Bot for persistent AI teammates with messaging and routines
Grok Bot is now available. Durable AI teammates that work on a persistent cloud computer, with messaging, approvals, connectors, and routines.
grok-imagine-video-1.5 now supports text-to-video, image-to-video, and reference-to-video (including optional preset voices), with native 1080p for T2V and I2V. Text-to-video on this model runs as text-to-image then image-to-video under the hood.
Expanded capabilities for grok-imagine-video-1.5 with new modalities
Release of Grok Voice Think Fast 2.0 with Speech to Speech capabilities
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.
Added vad_threshold parameter for Speech to Text API
Speech to Text now accepts a vad_threshold parameter (streaming query param and batch multipart field) to tune the voice-activity gate that skips non-speech audio. Lower values transcribe quieter or noisier speech - useful for narrowband telephony - and 0 disables the gate.
Grok 4.5 availability in EU region with pricing details
Grok 4.5 is now available in the API console for EU users.
Release of Grok 4.5 with coding and knowledge work capabilities
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).
Priority Processing feature for text inference endpoints
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 u…
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. Reference stored files as Imagine inputs - substitute image_file_…
Public URLs and Files API integration for Imagine services
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.
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 sequen…
Smart Turn end-of-turn detection for streaming STT
Context Compaction API for reducing conversation context size
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.
Image search capability in Web Search API
Web Search now supports explicitly searching for images. Enable enable_image_search to let Grok search directly for relevant images; responses can include returned images as Markdown image embeds.
Grok Build 0.1 coding model for agentic workflows in early access
SpaceXAI's coding model, trained specifically for agentic coding workflows. Currently in early access. The model slug is grok-build-0.1 .
Grok Build beta availability with TUI and agent client protocol
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
Custom Voices feature for TTS and STT APIs
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.
Cost tracking feature with cost_in_usd_ticks in API responses
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.
Files API TTL expiration policy for uploaded files
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 Speech to Speech API. To get started, check out the Speech to Speech docs. For more details, see our blog post .
General availability of xAI Speech to Text API
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.
General availability of Text-to-Speech API
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. Batch AP…
JSONL file upload support for Batch API
Batch API support for image/video generation and chat completions
Grok 4.20 and Multi-agent versions launch with new capabilities
xAI added Grok 4.20 Beta and a Grok 4.20 Multi-agent Beta to the xAI Enterprise API, expanding the official model lineup for enterprise users.
xAI made Grok 4.20 and Grok 4.20 Multi-agent live in the API, extending the Grok lineup with multi-agent support for developers.
xAI added video generation and a revamped image-generation experience to the Grok product stack.
xAI released Batch API for all customers, enabling efficient bulk request processing across chat, image, and video workloads.
General availability of Grok Speech to Speech API
Grok Speech to Speech API is generally available. Visit Grok Speech to Speech API for guidance on using the API.
Grok 4.1 Fast availability in Enterprise API with pricing updates
You can now use Grok 4.1 Fast in the xAI Enterprise API . For more details, check out our blogpost . Agent tools adapt to Grok 4.1 Fast models and tool prices dropped You can now use Grok 4.1 Fast models with the agent tools, check out the documentation of agent tools to get sta…
Files API general availability for file management
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…
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 .
New tools available for agent workflows including web_search and code_execution
Responses API general availability for stateful processing
You can now use our stateful Responses API to process requests.
Collections API release for file embeddings and inference
You can upload files, create embeddings, and use them for inference with our Collections API.
You can now use Grok 4 via our API or on https://grok.com .
Management API for API key management
You can manage your API keys via Management API at https://management-api.x.ai .
You can now use cached prompt to save on repeated prompts.
Cached prompt feature for repeated prompt optimization
Live search is now available on API. Users can generate completions with queries on supported data sources.
Live Search availability on API for real-time data queries
Our latest flagship Grok 3 models are now generally available via the API.
Grok 3 models launch on API with technical documentation
The image generation model is available on API. Visit Image Generations for more details on using the model.
Image Generation Model availability on API with usage guidelines
Audit Logs feature for team administrators
Team admins can now view audit logs on console.x.ai.
Dark mode release for documentation site
Status Page for monitoring service statuses
Replit integration with SpaceXAI for agent workflows
Tokenizer Playground for understanding token counts
Tokenizer playground to understand tokens
Structured Outputs feature for formatted API responses
Grok now supports structured outputs. Grok can now format responses in a predefined, organized format rather than free-form text.
Released the new grok-2-1212 and grok-2-vision-1212 models. Offering better accuracy, instruction-following, and multilingual capabilities.
Public beta of our API, which gives developers programmatic access to our Grok series of foundation models.
Releases per month over the last 12 months. Busiest month: May 2026, 13 releases.
Releases in the last 12 months by category and product.
The most recent xAI update we track is “safety_identifier request field”, released on September 25, 2026.
xAI shipped 5 updates in September 2026, including “safety_identifier request field”, “Safety Identifier Field Addition”, “Grok 4.7 Model Release” and 2 mores.
We tracked 63 updates from xAI in the last 12 months, about 5 a month. The busiest month was May 2026, with 13 releases.
xAI publishes release notes on xAI Release Notes, linked at the top of this page. Every entry here links back to the official page it came from.
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