fix(ovhcloud): migrate reasoning_content->reasoning and duration->seconds fields

OVHCloud is deprecating two response fields on 2026-05-11:
- reasoning_content replaced by reasoning (LLM reasoning models)
- duration replaced by seconds (Speech-to-Text models)

Adds backward-compatible support for both field names during the
transition window, preferring the new field when present and falling
back to the legacy field.

Fixes #26586

litellm/llms/ovhcloud/audio_transcription/transformation.py

@@ -156,5 +156,13 @@ class OVHCloudAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
         text = response_json.get("text") or response_json.get("transcript") or ""
         response = TranscriptionResponse(text=text)
 
+        # OVHCloud field migration (deadline: 2026-05-11):
+        # `duration` is replaced by `seconds` in STT responses.
+        # Prefer `seconds`, fall back to `duration`, normalize to `duration`
+        # so downstream consumers see a consistent key.
+        duration = response_json.get("seconds") or response_json.get("duration")
+        if duration is not None:
+            response_json["duration"] = duration
+
         response._hidden_params = response_json
         return response

litellm/llms/ovhcloud/chat/transformation.py

@@ -98,10 +98,16 @@ class OVHCloudChatCompletionStreamingHandler(BaseModelResponseIterator):
 
             new_choices = []
             for choice in chunk["choices"]:
-                if "delta" in choice and "reasoning" in choice["delta"]:
-                    choice["delta"]["reasoning_content"] = choice["delta"].get(
-                        "reasoning"
-                    )
+                if "delta" in choice:
+                    delta = choice["delta"]
+                    # OVHCloud field migration (deadline: 2026-05-11):
+                    # `reasoning_content` is replaced by `reasoning`.
+                    # Normalise to `reasoning_content` so downstream consumers
+                    # see a consistent key during the transition window.
+                    reasoning_new = delta.get("reasoning")
+                    reasoning_legacy = delta.get("reasoning_content")
+                    if reasoning_new is not None and reasoning_legacy is None:
+                        delta["reasoning_content"] = reasoning_new
                 new_choices.append(choice)
 
             return ModelResponseStream(

tests/test_litellm/llms/ovhcloud/test_ovhcloud_audio_transcription_transformation.py

@@ -54,3 +54,46 @@ def test_ovhcloud_audio_transcription_config_installed():
 
     assert config is not None
     assert isinstance(config, BaseAudioTranscriptionConfig)
+
+
+
+class TestOVHCloudDurationFieldMigration:
+    """Tests for OVHCloud duration -> seconds field migration."""
+
+    def test_seconds_field_mapped_to_duration(self):
+        """New `seconds` field should be normalized to `duration`."""
+        from litellm.llms.ovhcloud.audio_transcription.transformation import (
+            OVHCloudAudioTranscriptionConfig,
+        )
+        from unittest.mock import MagicMock
+
+        config = OVHCloudAudioTranscriptionConfig()
+        mock_response = MagicMock()
+        mock_response.json.return_value = {
+            "text": "Hello world",
+            "seconds": 3.14,
+        }
+
+        result = config.transform_audio_transcription_response(mock_response)
+
+        assert result.text == "Hello world"
+        assert result._hidden_params["duration"] == 3.14
+
+    def test_legacy_duration_field_still_works(self):
+        """Legacy `duration` field should still be accepted."""
+        from litellm.llms.ovhcloud.audio_transcription.transformation import (
+            OVHCloudAudioTranscriptionConfig,
+        )
+        from unittest.mock import MagicMock
+
+        config = OVHCloudAudioTranscriptionConfig()
+        mock_response = MagicMock()
+        mock_response.json.return_value = {
+            "text": "Hello world",
+            "duration": 2.71,
+        }
+
+        result = config.transform_audio_transcription_response(mock_response)
+
+        assert result.text == "Hello world"
+        assert result._hidden_params["duration"] == 2.71

tests/test_litellm/llms/ovhcloud/test_ovhcloud_chat_transformation.py

@@ -292,3 +292,76 @@ def test_ovhcloud_with_custom_base_url():
 
 if __name__ == "__main__":
     pytest.main([__file__, "-v"])
+
+
+class TestOVHCloudReasoningFieldMigration:
+    """Tests for OVHCloud reasoning_content -> reasoning field migration."""
+
+    def test_streaming_new_reasoning_field(self):
+        """New `reasoning` field should be mapped to `reasoning_content`."""
+        handler = OVHCloudChatCompletionStreamingHandler(
+            streaming_response=iter([]),
+                        sync_stream=True,
+        )
+        chunk = {
+            "id": "test-id",
+            "created": 1234567890,
+            "model": "test-model",
+            "choices": [
+                {
+                    "delta": {
+                        "role": "assistant",
+                        "reasoning": "Let me think...",
+                    },
+                    "index": 0,
+                }
+            ],
+        }
+        result = handler.chunk_parser(chunk)
+        assert result.choices[0]["delta"]["reasoning_content"] == "Let me think..."
+
+    def test_streaming_legacy_reasoning_content_unchanged(self):
+        """Legacy `reasoning_content` field should pass through untouched."""
+        handler = OVHCloudChatCompletionStreamingHandler(
+            streaming_response=iter([]),
+                        sync_stream=True,
+        )
+        chunk = {
+            "id": "test-id",
+            "created": 1234567890,
+            "model": "test-model",
+            "choices": [
+                {
+                    "delta": {
+                        "role": "assistant",
+                        "reasoning_content": "Already correct field.",
+                    },
+                    "index": 0,
+                }
+            ],
+        }
+        result = handler.chunk_parser(chunk)
+        assert result.choices[0]["delta"]["reasoning_content"] == "Already correct field."
+
+    def test_streaming_both_fields_legacy_wins(self):
+        """When both fields present, existing `reasoning_content` is not overwritten."""
+        handler = OVHCloudChatCompletionStreamingHandler(
+            streaming_response=iter([]),
+                        sync_stream=True,
+        )
+        chunk = {
+            "id": "test-id",
+            "created": 1234567890,
+            "model": "test-model",
+            "choices": [
+                {
+                    "delta": {
+                        "reasoning": "new field",
+                        "reasoning_content": "legacy field",
+                    },
+                    "index": 0,
+                }
+            ],
+        }
+        result = handler.chunk_parser(chunk)
+        assert result.choices[0]["delta"]["reasoning_content"] == "legacy field"