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fix: support hyphenated Claude model names for Claude Code 2.1.x compatibility #250

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fix: support hyphenated Claude model names for Claude Code 2.1.x compatibility #250

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11 changes: 5 additions & 6 deletions src/routes/messages/non-stream-translation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -47,12 +47,11 @@ export function translateToOpenAI(
}

function translateModelName(model: string): string {
// Subagent requests use a specific model number which Copilot doesn't support
if (model.startsWith("claude-sonnet-4-")) {
return model.replace(/^claude-sonnet-4-.*/, "claude-sonnet-4")
} else if (model.startsWith("claude-opus-")) {
return model.replace(/^claude-opus-4-.*/, "claude-opus-4")
}
// Claude Code uses hyphenated model names (e.g. claude-sonnet-4-6) for its internal
// display mapping, but GitHub Copilot backend requires dot notation (e.g. claude-sonnet-4.6).
// Convert hyphenated minor versions to dot notation for all Claude model families.
const m = model.match(/^(claude-(?:sonnet|opus|haiku))-(\d+)-(\d+)$/)
if (m) return `${m[1]}-${m[2]}.${m[3]}`
return model
}

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