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[BOT ISSUE] xAI: mark retired grok-4-fast and grok-4-1-fast models as deprecated #700

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Description

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Summary

Follow-up to #696. Four additional xAI model families were retired on May 15, 2026 but are not marked as deprecated in model_list.json. These models no longer appear on the xAI models page.

Retired models (top 3 model IDs)

Model ID Line Replacement
grok-4-1-fast-reasoning 6860 grok-4.3
grok-4-1-fast-non-reasoning 6832 grok-4.3
grok-4-fast-reasoning 7013 grok-4.3

Additional entries also needing deprecation

Model ID Line
grok-4-fast-non-reasoning 6988
grok-4-1-fast-reasoning-latest 6874
grok-4-1-fast-non-reasoning-latest 6846
grok-4-fast-reasoning-latest 7027
grok-4-fast-non-reasoning-latest 7002

Verification

Suggested fix

Add "deprecated": true and "deprecation_date": "2026-05-15" to each entry.

{
  "kind": "deprecation",
  "provider": "xAI",
  "models": ["grok-4-1-fast-reasoning", "grok-4-1-fast-non-reasoning", "grok-4-fast-reasoning"],
  "status": "active",
  "fields_to_update": {
    "deprecated": {"old": null, "new": true},
    "deprecation_date": {"old": null, "new": "2026-05-15"}
  },
  "source_urls": [
    "https://docs.x.ai/developers/migration/may-15-retirement",
    "https://docs.x.ai/developers/models"
  ]
}

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