feat: add Grok 4.5 and 4.6 models

[louisvolant]

Summary

Adds the newly released Grok 4.5 and Grok 4.6 models to the hardcoded model registry in src/grok/models.ts.

Currently the CLI only knows models up to Grok 4.3, so both Grok 4.5 and Grok 4.6 must be entered via --model and are not listed by grok models.

Changes

• Add grok-4.6 — the latest flagship reasoning model.
• Add grok-4.5 — flagship reasoning model, including its grok-4.5-latest and grok-build-latest aliases.
• Pricing ($2 in / $6 out per 1M tokens) and context window (500K) taken directly from the xAI Models API.

Verification

• grok models lists both new models with correct metadata.
• bun run build succeeds.
• Existing model tests in src/grok/models.test.ts pass.

Screenshot

  grok-4.6 — Grok 4.6 (reasoning)
    Latest flagship reasoning model | 500K context | $2/$6 per 1M tokens
  grok-4.5 — Grok 4.5 (reasoning)
    Flagship reasoning model | 500K context | $2/$6 per 1M tokens
    aliases: grok-4.5-latest, grok-build-latest

---

Note

Low Risk
Static catalog metadata only; no runtime, auth, or API behavior changes.

Overview
Registers Grok 4.6 and Grok 4.5 in the hardcoded MODELS list in models.ts so grok models and --model can use them without manual IDs.

Both entries are reasoning flagships with 500K context and $2 / $6 per 1M input/output tokens. Grok 4.5 also maps aliases grok-4.5-latest and grok-build-latest. DEFAULT_MODEL remains grok-4.3.

^{Reviewed by Cursor Bugbot for commit 5f96638. Configure here.}

[open-cla]

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