diff --git a/open-sse/services/model.ts b/open-sse/services/model.ts
index 3c167da206..c27aeb8b3b 100644
--- a/open-sse/services/model.ts
+++ b/open-sse/services/model.ts
@@ -242,8 +242,8 @@ export async function getModelInfoCore(modelStr, aliasesOrGetter) {
   // FIX #73: Models like claude-haiku-4-5-20251001 sent without provider prefix
   // would incorrectly route to OpenAI. Use heuristic prefix detection first.
   if (/^claude-/i.test(modelId)) {
-    // Claude models → Antigravity (Anthropic) provider
-    return { provider: "antigravity", model: modelId, extendedContext };
+    // Claude models → Anthropic provider (canonical source for Claude models)
+    return { provider: "anthropic", model: modelId, extendedContext };
   }
   if (/^gemini-/i.test(modelId) || /^gemma-/i.test(modelId)) {
     // Gemini/Gemma models → Gemini provider