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fix(opencode): add model aliases for GitHub Copilot model names #811

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fix(opencode): add model aliases for GitHub Copilot model names #811

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20 changes: 20 additions & 0 deletions apps/opencode/src/cost-utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,28 @@ import { Result } from '@praha/byethrow';
/**
* Model aliases for OpenCode-specific model names that don't exist in LiteLLM.
* Maps OpenCode model names to their LiteLLM equivalents for pricing lookup.
*
* GitHub Copilot uses dot notation (e.g., claude-opus-4.5) while LiteLLM uses
* hyphen notation (e.g., claude-opus-4-5). This mapping handles those differences.
*
* GitHub Copilot model names are sourced from: https://models.dev/api.json
*/
const MODEL_ALIASES: Record<string, string> = {
// GitHub Copilot uses dots, LiteLLM uses hyphens for Claude 4.5 models
'claude-opus-4.5': 'claude-opus-4-5',
'claude-sonnet-4.5': 'claude-sonnet-4-5',
'claude-haiku-4.5': 'claude-haiku-4-5',
// GitHub Copilot shorthand names for Claude 4 models
'claude-opus-4': 'claude-opus-4-20250514',
'claude-opus-41': 'claude-opus-4-1',
'claude-sonnet-4': 'claude-sonnet-4-20250514',
// GitHub Copilot Claude 3.x model names
'claude-3.5-sonnet': 'claude-3-5-sonnet-latest',
'claude-3.7-sonnet': 'claude-3-7-sonnet-latest',
// Extended thinking variant uses same pricing as base model
'claude-3.7-sonnet-thought': 'claude-3-7-sonnet-latest',
// Grok models require provider prefix
'grok-code-fast-1': 'xai/grok-code-fast-1',
// OpenCode uses -high suffix for higher tier/thinking mode variants
'gemini-3-pro-high': 'gemini-3-pro-preview',
};
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