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AI release notes

xAI's official release notes for Grok: new Grok models and what changed for developers building with them.

Compiled by the Toolstash team · Updated

  1. Grok API

    Custom moderation controls

    You can now set content guidelines on text API requests. Add a guidelines array to a Chat Completions or Responses API request to set how Grok handles content in the nsfw, violence, and profanity categories. Grok follows the guidelines as it writes its response.

  2. Grok API

    Grok Voice 2.0 deprecation

    grok-voice-2.0 is deprecated. To upgrade, set model to grok-voice-3.0 or grok-voice-latest, at the same price.

  3. New model

    Grok Voice 3.0 is available

    grok-voice-3.0 is now available with Speech to Speech, at the same price as Grok Voice 2.0. grok-voice-latest now points to grok-voice-3.0, so sessions that use the alias are upgraded automatically. The API is unchanged.

  4. New model

    grok-voice-transcribe-1.0 end of life

    grok-voice-transcribe-1.0 is deprecated and reaches end of life on October 2, 2026. All requests to that slug are routed to grok-voice-transcribe-2.0 at the same price, with higher accuracy.

  5. Grok API

    grok-imagine-image-quality retirement on November 2

    On November 2, 2026, grok-imagine-image-quality is retired. Requests to the slug will be served by grok-imagine-image-2.0 with quality set to low, with no change to the request or response shape and at a lower per-image price. grok-imagine-image (1.0) is not affected.

  6. Grok API

    safety\_identifier request field

    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 SpaceXSI attribute a policy violation to one of your end users rather than to your API key. The legacy user field is still accepted.

  7. New modelAnnouncement

    Grok 4.7

    Grok 4.7, SpaceXSI'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 / cached input / output) below 200k prompt tokens, and $4 / $1 / $12 above.

  8. New model

    Grok Voice Transcribe 2.0

    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.

  9. Grok API

    Grok Bot

    Grok Bot is now available. Durable AI teammates that work on a persistent cloud computer, with messaging, approvals, connectors, and routines.

  10. Grok API

    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.

  11. New modelAnnouncement

    Grok 4.6

    Grok 4.6, SpaceXSI'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.

  12. Grok API

    Adjustable VAD threshold for Speech to Text

    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.

  13. New modelAnnouncement

    Grok 4.5

    Grok 4.5, SpaceXSI'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).

  14. New model

    Grok 4.5 available in the EU

    Grok 4.5 is now available in the API console for EU users.

  15. New model

    grok-imagine-video-1.5 modalities

    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.

  16. New modelAnnouncement

    Grok Voice 2.0 is available

    grok-voice-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.

  17. New modelAnnouncement

    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.

  18. Grok API

    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.

  19. Grok API

    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. 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.

  20. Grok API

    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.

  21. Grok APIAnnouncement

    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 SpaceXSI console.

  22. Grok API

    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 customLanguage="bash" curl -fsSL https://x.ai/cli/install.sh | bash For more details, see the Grok Build docs.

  23. Grok API

    Image Search in Web Search

    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. For details, see Enable Image Search.

  24. Grok API

    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.

  25. Grok API

    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.

  26. New model

    Grok Build 0.1

    SpaceXSI's coding model, trained specifically for agentic coding workflows. Currently in early access. The model slug is grok-build-0.1.

  27. Grok API

    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.

  28. Grok API

    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.

  29. Grok API

    Speech to Text is available

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

  30. New modelAnnouncement

    Grok Voice 1.0 is available

    Grok Voice 1.0 is now available with the Speech to Speech API. To get started, check out the Speech to Speech docs.