diff --git a/fle/eval/inspect/sandbox/sandbox_solver.py b/fle/eval/inspect/sandbox/sandbox_solver.py
index 6b2068457..9056a6f80 100644
--- a/fle/eval/inspect/sandbox/sandbox_solver.py
+++ b/fle/eval/inspect/sandbox/sandbox_solver.py
@@ -241,10 +241,16 @@ async def solve(state: AgentState, *args, **kwargs) -> AgentState:
                     # Generate LLM response (host-side)
                     generation_config = {
                         "max_tokens": 4096,
-                        "transforms": ["middle-out"],
                         "reasoning_effort": "minimal",
                     }
-                    state.output = await get_model().generate(
+                    _model = get_model()
+                    model_name_str = (
+                        getattr(_model, "name", "") if hasattr(_model, "name") else ""
+                    )
+                    if model_name_str and "openrouter" in model_name_str:
+                        generation_config["transforms"] = ["middle-out"]
+
+                    state.output = await _model.generate(
                         input=state.messages,
                         config=generation_config,
                     )