[model-inventory] Fix pricing for gpt-5.6-luna, gpt-5.6-terra, and grok-4.5

[Copilot]

Three models in models.json had stale pricing that diverged from the Copilot docs pricing table and reflect API.

Corrections

Model	Input ($/M)	Output ($/M)
gpt-5.6-luna	$1.00 → $0.20	$6.00 → $1.20
gpt-5.6-terra	$2.50 → $2.00	$15.00 → $12.00
grok-4.5	$0.20 → $2.00	$0.60 → $6.00

Applied to both pkg/cli/data/models.json and actions/setup/js/models.json (kept identical). No alias, routing, or other metadata changes needed.

• Fixes [model-inventory] Model alias inventory update - 2026-08-01 #49428

[Copilot]

Pull request overview

Corrects Copilot token pricing for three models across both runtime catalogs.

Changes:

• Updates input and output prices for GPT-5.6 Luna, GPT-5.6 Terra, and Grok 4.5.
• Keeps the CLI and setup-action catalogs synchronized.
• Cached-input prices still require correction.

Show a summary per file

File	Description
pkg/cli/data/models.json	Updates CLI model pricing.
actions/setup/js/models.json	Mirrors pricing for the setup action.

Review details

Tip

Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

Suppressed comments (4)

pkg/cli/data/models.json:536

• Grok's cached-input rate was not updated with the other prices. The linked inventory run reports cacheReadPrice: 50 ($0.50/M), while this retains $0.05/M, undercounting cached-token AIC by 10×.

            "input": "2e-06",
            "output": "6e-06",

actions/setup/js/models.json:500

• The mirrored Terra entry retains the stale $0.25/M cached-input rate. The inventory source reports $0.20/M, so this action-side catalog would still overstate cache-hit costs.

            "input": "2e-06",
            "output": "1.2e-05",

actions/setup/js/models.json:536

• The mirrored Grok entry still uses the old $0.05/M cached-input rate. The linked inventory run reports $0.50/M, so cached-token AIC from the setup action remains 10× too low.

            "input": "2e-06",
            "output": "6e-06",

pkg/cli/data/models.json:500

• Terra's cached-input price is still the old $0.25/M value. The inventory data used for this update reports $0.20/M, so cache-hit costs remain overstated unless cache_read is corrected too.

            "input": "2e-06",
            "output": "1.2e-05",

• Files reviewed: 2/2 changed files
• Comments generated: 2
• Review effort level: Balanced

[github-actions]

🎉 This pull request is included in a new release.

Release: v0.84.2