Changelog
The Grok and xAI changelog
Grok ships often, so this is the dated log of what actually changed, drawn from the official xAI developer release notes and dated announcements. Each entry links to the source so you can verify it. Rumors and unconfirmed roadmap claims are kept out.
API Priority Processing and Files API public URLs
A priority service tier billed only when used, plus public file URLs that Grok Imagine can reuse as inputs.
xAI developer release notesGrok Build 0.1, Context Compaction, and Custom Voices
The early-access Grok Build coding model (256k context), a context-compaction API, a WebSocket Responses mode, image search in Web Search, and custom voices.
xAI developer release notesSpeech-to-Text general availability and per-response cost
Speech-to-text reached general availability across 25 languages, responses began reporting a usage cost field, and the Files API gained a time-to-live setting.
xAI developer release notesGrok 4.20 flagship and the multi-agent variant
The Grok 4.20 launch with a multi-agent orchestration model, text-to-speech general availability, and the Batch API extended to image and video.
xAI developer release notesGrok Imagine v0.9 video, free across products
xAI announced Imagine video v0.9 as a free rollout across its products, with native audio generation aligned to the visuals in a single pass.
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