[model-inventory] Add missing MAI-Code model entry and correct Copilot cache-read pricing

[Copilot]

Daily inventory identified one missing github-copilot model in models.json and several cache_read mismatches, including a confirmed 10x underpriced grok-4.5 cache-read value. Alias coverage was already complete, so this PR is scoped to pricing/catalog correctness only.

• Model catalog sync (pkg/cli/data/models.json, actions/setup/js/models.json)

  • Added mai-code-1.1-flash with Copilot SDK-aligned pricing (input, output, cache_read, cache_write).
  • Kept both model inventories byte-aligned by applying the same edit to both files.

• Pricing corrections (github-copilot entries)

  • Corrected cache_read for:
    • grok-4.5 (5e-08 → 5e-07)
    • gpt-5.4-mini (7.5e-08 → 7e-08)
    • gpt-5.3-codex (1.75e-07 → 1.7e-07)
    • gpt-5-mini (2.5000000000000002e-08 → 2e-08)
    • mai-code-1-flash-picker (7.5e-08 → 7e-08)

• Regression coverage (pkg/cli/model_costs_test.go)

  • Added targeted assertions for:
    • mai-code-1.1-flash pricing lookup (including cache_write)
    • grok-4.5 pricing lookup with corrected cache-read value

"mai-code-1.1-flash": {
  "cost": {
    "input": "2e-07",
    "output": "1.2e-06",
    "cache_read": "2e-08",
    "cache_write": "2.5e-07"
  },
  "provider_type": "openai",
  "wire_api": "responses"
}

• Fixes [model-inventory] Model alias inventory update - 2026-08-12 #52187

[github-actions]

🎉 Great work on the model inventory update, Copilot! This PR is well-executed and looks ready for review.

Your approach to keep both models.json files in sync while correcting the 10x underpriced grok-4.5 cache-read value and adding the missing mai-code-1.1-flash model entry is exactly what's needed. The addition of targeted regression tests for the new model and the corrected pricing gives confidence that these catalog changes won't regress.

✅ What's working well:

• Clear scope (pricing/catalog correctness only)
• Both model inventory files kept byte-aligned
• Regression test coverage for both the new model and the corrected pricing
• Detailed PR body explaining each change
• References issue [model-inventory] Model alias inventory update - 2026-08-12 #52187 showing integration with the daily inventory process

This PR is ready for maintainer review and merge.

Generated by ✅ Contribution Check · auto · 51.1 AIC · ⌖ 2.96 AIC · ⊞ 8.8K · ◷

[Copilot]

Pull request overview

Synchronizes Copilot model pricing catalogs with the latest inventory.

Changes:

• Adds mai-code-1.1-flash pricing.
• Corrects five cache-read prices.
• Adds regression tests for MAI-Code and Grok pricing.

Show a summary per file

File	Description
pkg/cli/model_costs_test.go	Tests new and corrected pricing.
pkg/cli/data/models.json	Updates the CLI pricing catalog.
actions/setup/js/models.json	Mirrors the catalog updates.

Review details

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced