Split models: Sonnet for discoveries (accuracy), Haiku for everything else (cost)

backend/app/api/endpoints/compatibility.py

@@ -139,7 +139,7 @@ Return ONLY the JSON. Include exactly 5 recommendations."""
 
     client = anthropic.Anthropic(api_key=settings.ANTHROPIC_API_KEY)
     message = client.messages.create(
-        model="claude-sonnet-4-20250514",
+        model="claude-haiku-4-5-20251001",
         max_tokens=1024,
         messages=[{"role": "user", "content": prompt}],
     )