Vercel AI SDK Adds Support for xAI's Grok Imagine Video 1.5, Including 1080p Output

What happened

Vercel shipped version 3.0.121 of @ai-sdk/xai, the xAI provider package for its AI SDK, adding support for xAI's grok-imagine-video-1.5 model. The patch release, tagged on GitHub, introduces native 1080p output for both text-to-video and image-to-video generation modes.

Technical details

According to the changelog, requests using the standard resolution: '1920x1080' parameter now map directly to the model's native 1080p output mode for text-to-video and image-to-video tasks. Reference-to-video generation — where a user supplies a reference image or clip — remains capped at 720p. If a developer requests 1080p in reference-to-video mode, the SDK downgrades the request and issues a warning rather than failing silently.

The update also fixes a routing bug affecting the inputReferences parameter. Previously, any non-empty inputReferences array triggered reference-to-video mode, even when the array contained only non-image references. This caused the SDK to send an empty reference_images: [] payload to xAI's API with no usable reference data, effectively breaking the request. The fix ensures reference-to-video mode only activates when a genuine image reference is present.

Separately, the release adds a new referenceVoiceIds parameter for reference-to-video generation. Developers can now pass up to three xAI preset voice IDs — for example ['eve'] — and reference them in prompts using placeholder tags <AUDIO_0> through <AUDIO_2>. The SDK translates these into a reference_audios array of { voice_id } objects sent to xAI's POST /v1/videos/generations endpoint, allowing generated videos to include synchronized preset voice audio.

Why it matters for developers

This is a patch release to Vercel's provider integration, not a new model announcement from xAI itself. The grok-imagine-video-1.5 model ID already existed on xAI's side; this update simply brings the AI SDK's parameter handling in line with the model's actual capabilities and fixes a real bug that silently broke reference-based video generation for some request shapes.

Pricing for grok-imagine-video-1.5 was not disclosed in this changelog. Developers using xAI's video generation API through Vercel's AI SDK should consult xAI's own API documentation for current per-generation or per-second pricing.

What this means

For teams building on xAI's video generation stack via Vercel's AI SDK, this update removes a rough edge: reference-to-video requests that previously failed due to the inputReferences misclassification bug should now route correctly. The 1080p support and voice-referencing feature also expand what's possible without dropping to xAI's raw API — useful for teams that want to stay inside the SDK's abstraction layer. This is routine maintenance work that keeps a third-party SDK synchronized with a provider's evolving API surface, rather than a signal of new model capability from xAI.