A couple of fixes for OpenAI o3 (#1031)

Co-authored-by: openhands <[email protected]>

Author: enyst

openhands-sdk/openhands/sdk/llm/llm.py

@@ -822,6 +822,16 @@ def _init_model_info_and_caps(self) -> None:
                 elif isinstance(self._model_info.get("max_tokens"), int):
                     self.max_output_tokens = self._model_info.get("max_tokens")
 
+        if "o3" in self.model:
+            o3_limit = 100000
+            if self.max_output_tokens is None or self.max_output_tokens > o3_limit:
+                self.max_output_tokens = o3_limit
+                logger.debug(
+                    "Clamping max_output_tokens to %s for %s",
+                    self.max_output_tokens,
+                    self.model,
+                )
+
     def vision_is_active(self) -> bool:
         with warnings.catch_warnings():
             warnings.simplefilter("ignore")

openhands-sdk/openhands/sdk/llm/utils/model_features.py

@@ -69,8 +69,9 @@ class ModelFeatures:
 ]
 
 SUPPORTS_STOP_WORDS_FALSE_PATTERNS: list[str] = [
-    # o1 family doesn't support stop words
+    # o-series families don't support stop words
     "o1",
+    "o3",
     # grok-4 specific model name (basename)
     "grok-4-0709",
     "grok-code-fast-1",