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fix(messages): preserve Claude 4.x version suffix so vision routes to the right model #254

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fix(messages): preserve Claude 4.x version suffix so vision routes to the right model #254

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1 change: 1 addition & 0 deletions bun.lock
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13 changes: 12 additions & 1 deletion src/routes/messages/non-stream-translation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,18 @@ export function translateToOpenAI(
}

function translateModelName(model: string): string {
// Subagent requests use a specific model number which Copilot doesn't support
// Claude Code sends dash-versioned model IDs with date suffixes
// (e.g. "claude-opus-4-7-20251030"), but Copilot exposes dot-versioned
// IDs (e.g. "claude-opus-4.7"). Convert dash → dot for known 4.x families
// so that vision-capable models route correctly instead of falling back.
const versioned = model.match(
/^claude-(opus|sonnet|haiku)-(\d+)-(\d+)(?:-\d{6,8})?$/,
)
if (versioned) {
return `claude-${versioned[1]}-${versioned[2]}.${versioned[3]}`
}

// Legacy fallback: subagent requests with unsupported numeric suffixes
if (model.startsWith("claude-sonnet-4-")) {
return model.replace(/^claude-sonnet-4-.*/, "claude-sonnet-4")
} else if (model.startsWith("claude-opus-")) {
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