Refactor model detection to use modelPricing.json data

[Copilot]

Hard-coded model name mappings in getModelFromRequest made adding new models require code changes. This refactors model detection to be data-driven using modelPricing.json.

Changes

• Added displayNames field to modelPricing.json: Maps display names found in session logs to model IDs for 13 models
• Updated ModelPricing interface: Added optional displayNames?: string[] field
• Refactored getModelFromRequest method: Replaced 13 hard-coded conditionals with dynamic lookup from modelPricing.json

Before

if (request.result.details.includes('Claude Sonnet 3.5')) { return 'claude-sonnet-3.5'; }
if (request.result.details.includes('Claude Sonnet 3.7')) { return 'claude-sonnet-3.7'; }
if (request.result.details.includes('GPT-4.1')) { return 'gpt-4.1'; }
// ... 10 more hard-coded checks

After

// Build reverse lookup: displayName -> modelId
const displayNameToModelId: { [displayName: string]: string } = {};
for (const [modelId, pricing] of Object.entries(this.modelPricing)) {
  if (pricing.displayNames) {
    for (const displayName of pricing.displayNames) {
      displayNameToModelId[displayName] = modelId;
    }
  }
}

// Match longest names first to handle overlaps (e.g., "Gemini 3 Pro (Preview)" vs "Gemini 3 Pro")
const sortedDisplayNames = Object.keys(displayNameToModelId).sort((a, b) => b.length - a.length);
for (const displayName of sortedDisplayNames) {
  if (request.result.details.includes(displayName)) {
    return displayNameToModelId[displayName];
  }
}

New models now require only JSON updates, no code changes.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[REFACTOR] Don't hard code model names</issue_title>
<issue_description>Ensure these data are removed here and retrieved from their primary store (whichever that is):

github-copilot-token-usage/src/extension.ts

Lines 2292 to 2314 in f49e955

	private getModelFromRequest(request: any): string {
	// Try to determine model from request metadata
	if (request.result && request.result.metadata && request.result.metadata.modelId) {
	return request.result.metadata.modelId;
	}
	if (request.result && request.result.details) {
	if (request.result.details.includes('Claude Sonnet 3.5')) { return 'claude-sonnet-3.5'; }
	if (request.result.details.includes('Claude Sonnet 3.7')) { return 'claude-sonnet-3.7'; }
	if (request.result.details.includes('Claude Sonnet 4')) { return 'claude-sonnet-4'; }
	if (request.result.details.includes('Gemini 2.5 Pro')) { return 'gemini-2.5-pro'; }
	if (request.result.details.includes('Gemini 3 Pro (Preview)')) { return 'gemini-3-pro-preview'; }
	if (request.result.details.includes('Gemini 3 Pro')) { return 'gemini-3-pro'; }
	if (request.result.details.includes('GPT-4.1')) { return 'gpt-4.1'; }
	if (request.result.details.includes('GPT-4o-mini')) { return 'gpt-4o-mini'; }
	if (request.result.details.includes('GPT-4o')) { return 'gpt-4o'; }
	if (request.result.details.includes('GPT-4')) { return 'gpt-4'; }
	if (request.result.details.includes('GPT-5')) { return 'gpt-5'; }
	if (request.result.details.includes('GPT-3.5-Turbo')) { return 'gpt-3.5-turbo'; }
	if (request.result.details.includes('o3-mini')) { return 'o3-mini'; }
	if (request.result.details.includes('o4-mini')) { return 'o4-mini'; }
	}
	return 'gpt-4'; // default
	}

If the data are stored, it would be here: https://github.com/rajbos/github-copilot-token-usage/blob/main/src/modelPricing.json

I prefer to store the model ID and not the name.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [REFACTOR] Don't hard code model names #150

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