API-key preset pointing at https://api.x.ai/v1 with wire_api =
"responses": xAI serves the Responses API natively, so no route
takeover conversion is needed. Ships a grok-4.5 catalog entry
(500K context, parallel tools, text+image) so the model shows up
under Codex's strict catalog parsing. This is deliberately not a
managed-account preset: providerType stays absent, pinned by a
regression test alongside the Claude-side xAI OAuth presets.
Register the xai_oauth provider type constant and add xAI (Grok) presets
targeting grok-4.5. The Desktop preset routes branded claude-* model IDs
to grok-4.5 upstream so it passes Desktop's third-party model validation.
Jason