[BOT ISSUE] xAI: add missing grok-build-0.1 model

[github-actions]

Gap

The xAI model grok-build-0.1 is missing from packages/proxy/schema/model_list.json. This is xAI's coding-focused chat model launched in May 2026, currently in early access. It supports text + image input → text output, function calling, structured outputs, and reasoning.

Official sources

Field	Source	URL
Model ID, pricing, context window	xAI Models page	https://docs.x.ai/developers/models
Model ID, pricing, capabilities, regions	Dedicated model page	https://docs.x.ai/developers/models/grok-build-0.1
Release date (May 2026)	Release notes	https://docs.x.ai/developers/release-notes

Verified fields

• Model ID: grok-build-0.1 — confirmed on models page and dedicated model page
• Format: openai — xAI uses OpenAI-compatible API format (same as all other grok models in catalog)
• Flavor: chat
• Multimodal: true — accepts text and image input (confirmed on model detail page)
• Input cost: $1.00 / 1M tokens — confirmed on both models page and model detail page
• Output cost: $2.00 / 1M tokens — confirmed on both models page and model detail page
• Cached input cost: $0.20 / 1M tokens — confirmed on model detail page
• Reasoning: true — listed as a capability on model detail page
• Context window (max_input_tokens): 256000 — confirmed on both models page (256k) and model detail page (256,000 tokens)
• Available providers: ["xAI"]

Fields NOT published

• max_output_tokens: Not specified on models page or model detail page. Should be omitted or left for manual review.
• displayName: Not officially published; suggest "Grok Build 0.1" based on naming pattern.

Local files inspected

• packages/proxy/schema/model_list.json — grep for grok-build returns no matches
• Existing xAI models use format openai, flavor chat, and available_providers: ["xAI"]

Verification notes

• Cross-source: Model ID confirmed on (1) models listing page, (2) dedicated model detail page, and (3) release notes — three independent official signals.
• Recent commits: Model not present in current model_list.json. Recent commits (visible in git status) do not reference grok-build.
• ID format: grok-build-0.1 matches xAI convention of plain model IDs (like grok-4.3, grok-4.20-0309-reasoning).
• No duplicate issue: Checked all 77 existing [BOT ISSUE] titles — none reference grok-build.

{
  "kind": "missing_model",
  "provider": "xAI",
  "models": ["grok-build-0.1"],
  "status": "active",
  "model_specs": {
    "grok-build-0.1": {
      "format": "openai",
      "flavor": "chat",
      "multimodal": true,
      "input_cost_per_mil_tokens": 1.0,
      "output_cost_per_mil_tokens": 2.0,
      "input_cache_read_cost_per_mil_tokens": 0.2,
      "reasoning": true,
      "max_input_tokens": 256000,
      "available_providers": ["xAI"]
    }
  },
  "source_urls": [
    "https://docs.x.ai/developers/models",
    "https://docs.x.ai/developers/models/grok-build-0.1",
    "https://docs.x.ai/developers/release-notes"
  ]
}

Summary: Add grok-build-0.1 to the xAI section of the model catalog. All fields except max_output_tokens are verified from official sources.

[github-actions]

Prepared catalog updates for grok-build-0.1. Added models: grok-build-0.1.

Verification sources: https://docs.x.ai/developers/models, https://docs.x.ai/developers/models/grok-build-0.1, https://docs.x.ai/developers/release-notes
Verified metadata applied:

• grok-build-0.1: format=openai, flavor=chat, max_input_tokens=256000, max_output_tokens=not provided, pricing(input/output per 1M)=1/2, input_cache_read_cost_per_mil_tokens=0.2, providers=xAI, reasoning=true, multimodal=true

Opened #663 to apply the catalog update.