fix(eval): fix reflection model used in GEPA optimizer (#814)

* fix(eval): update reflection model to claude-sonnet-4-5

Claude 3.5 Sonnet was retired on October 22, 2025.
Update GEPA optimizer to use claude-sonnet-4-5 with provider prefix.

Fixes model 404 errors in GEPA optimization runs.

Co-authored-by: Bob <bob@superuserlabs.org>

* fix

---------

Co-authored-by: Test User <test@example.com>

Author: TimeToBuildBob

gptme/eval/dspy/prompt_optimizer.py

@@ -46,15 +46,9 @@ def to_dspy_format(gptme_model: str) -> str:
     def get_reflection_model(base_model: str) -> str:
         """Get a more powerful model for reflection tasks."""
         if base_model.startswith("anthropic/"):
-            if "haiku" in base_model.lower():
-                return "claude-3-5-sonnet-20241022"
-            else:
-                return "claude-3-5-sonnet-20241022"
+            return "claude-sonnet-4-5"
         elif base_model.startswith("openai/"):
-            if "gpt-3.5" in base_model.lower() or "gpt-4o-mini" in base_model.lower():
-                return "gpt-4o"
-            else:
-                return "gpt-4o"
+            return "gpt-5"
         else:
             return ModelNameMapper.to_dspy_format(base_model)