backend new models check - xai - 2026-09-16

Files checked: `src/backend/drivers/ai-chat/providers/xai/models.ts`, `src/backend/drivers/ai-image/providers/xai/models.ts`, `src/backend/drivers/ai-tts/providers/xai/costs.ts`

**chat (0)** — all upstream grok chat ids/aliases (grok-4.3, grok-4.5, grok-4.6... wait, see note) already match backend id/alias set except as noted below.

**image (2)**
- `grok-imagine-image-2.0` | aliases: none | context: 64000 | created: 2026-08-08 | price: tiered — low/1k: $0.40, low/2k: $0.60, medium/1k: $0.60, medium/2k: $0.80 (per raw payload scale; verify against https://docs.x.ai/developers/pricing)
Notes: distinct major version id, not a dated snapshot of `grok-imagine-image` (base already in backend) — genuinely new.
- `grok-imagine-image-pro` | aliases: found only inside the upstream `aliases[]` of parent id `grok-imagine-image-quality` | context: 16000 | created: 2026-04-03 (parent's created date) | price: see provider pricing page
Notes: this name never appears in the backend id/alias set even though its parent id `grok-imagine-image-quality` is supported — analogous to the known `grok-code-fast-1`-inside-`grok-build-0.1` alias-hiding pattern. Recommend verifying whether "pro" is a distinct paid tier worth adding as an alias or separate model.

skipped (unsupported modality): 2 — `grok-imagine-video` (created 2026-01-28), `grok-imagine-video-1.5` (created 2026-05-27, aliases `grok-imagine-video-1.5-preview` / `grok-imagine-video-1.5-2026-05-30`) — video, no xai video provider in backend.
legacy upstream models not in backend (verify intent): none

Alias-suggestion notes (not new, base already supported, already collapsed into base, no action needed): several dated `grok-4.20-*` reasoning/non-reasoning/multi-agent variants, and `grok-imagine-image`/`grok-imagine-image-quality` dated snapshots, are already covered by existing backend aliases.

Start with the three named files under src/backend/drivers/ai-* and compare their current xAI model IDs, aliases, and costs with the upstream entries. Verify the image pricing at the linked xAI pricing page and determine whether grok-imagine-image-2.0 and grok-imagine-image-pro need backend entries or aliases; done means confirmed additions are represented consistently while unsupported video models remain skipped.

Written by the indexing model from the issue text.