feat(moonshot): advertise json_schema response support on live models (#29683)

litellm.responses() already routes Moonshot through the responses->chat-completions
bridge, and Moonshot honors response_format json_schema on chat completions. The
cost-map entries left supports_response_schema unset, so discovery layers that gate
on that flag dropped Moonshot from structured-output / responses listings even though
the capability works end to end.

Set supports_response_schema on the nine models currently live on api.moonshot.ai:
kimi-k2.5, kimi-k2.6, the moonshot-v1 8k/32k/128k text and vision-preview variants,
and moonshot-v1-auto. Verified against the live API that each honors json_schema and
that litellm.responses() returns schema-valid structured output through the bridge.

litellm/model_prices_and_context_window_backup.json

@@ -25024,6 +25024,7 @@
         "source": "https://platform.moonshot.ai/docs/guide/kimi-k2-5-quickstart",
         "supports_function_calling": true,
         "supports_reasoning": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_video_input": true,
         "supports_vision": true
@@ -25040,6 +25041,7 @@
         "source": "https://platform.kimi.ai/docs/pricing/chat-k26",
         "supports_function_calling": true,
         "supports_reasoning": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_video_input": true,
         "supports_vision": true
@@ -25152,6 +25154,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-128k-0430": {
@@ -25176,6 +25179,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25189,6 +25193,7 @@
         "output_cost_per_token": 3e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-32k-0430": {
@@ -25213,6 +25218,7 @@
         "output_cost_per_token": 3e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25226,6 +25232,7 @@
         "output_cost_per_token": 2e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-8k-0430": {
@@ -25250,6 +25257,7 @@
         "output_cost_per_token": 2e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25263,6 +25271,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "morph/morph-v3-fast": {

model_prices_and_context_window.json

@@ -25024,6 +25024,7 @@
         "source": "https://platform.moonshot.ai/docs/guide/kimi-k2-5-quickstart",
         "supports_function_calling": true,
         "supports_reasoning": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_video_input": true,
         "supports_vision": true
@@ -25040,6 +25041,7 @@
         "source": "https://platform.kimi.ai/docs/pricing/chat-k26",
         "supports_function_calling": true,
         "supports_reasoning": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_video_input": true,
         "supports_vision": true
@@ -25152,6 +25154,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-128k-0430": {
@@ -25176,6 +25179,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25189,6 +25193,7 @@
         "output_cost_per_token": 3e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-32k-0430": {
@@ -25213,6 +25218,7 @@
         "output_cost_per_token": 3e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25226,6 +25232,7 @@
         "output_cost_per_token": 2e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "moonshot/moonshot-v1-8k-0430": {
@@ -25250,6 +25257,7 @@
         "output_cost_per_token": 2e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true,
         "supports_vision": true
     },
@@ -25263,6 +25271,7 @@
         "output_cost_per_token": 5e-06,
         "source": "https://platform.moonshot.ai/docs/pricing",
         "supports_function_calling": true,
+        "supports_response_schema": true,
         "supports_tool_choice": true
     },
     "morph/morph-v3-fast": {

tests/test_litellm/llms/moonshot/test_moonshot_chat_transformation.py

@@ -9,15 +9,12 @@ import os
 import sys
 from unittest.mock import patch
 
-sys.path.insert(
-    0, os.path.abspath("../../../../..")
-)  # Adds the parent directory to the system path
+sys.path.insert(0, os.path.abspath("../../../../.."))  # Adds the parent directory to the system path
 
 import pytest
 
 import litellm
 import litellm.utils
-from litellm import completion
 from litellm.litellm_core_utils.get_model_cost_map import GetModelCostMap
 from litellm.llms.moonshot.chat.transformation import MoonshotChatConfig
 
@@ -232,10 +229,7 @@ class TestMoonshotConfig:
         assert result["messages"][0]["role"] == "user"
         assert result["messages"][0]["content"] == "What's the weather like?"
         assert result["messages"][1]["role"] == "user"
-        assert (
-            result["messages"][1]["content"]
-            == "Please select a tool to handle the current issue."
-        )
+        assert result["messages"][1]["content"] == "Please select a tool to handle the current issue."
 
         # Check that tool_choice was removed but tools are preserved
         assert "tool_choice" not in result
@@ -273,10 +267,7 @@ class TestMoonshotConfig:
 
         # Check that the message was added
         assert len(result["messages"]) == 2
-        assert (
-            result["messages"][1]["content"]
-            == "Please select a tool to handle the current issue."
-        )
+        assert result["messages"][1]["content"] == "Please select a tool to handle the current issue."
 
     def test_tool_choice_non_required_preserved(self):
         """Test that non-'required' tool_choice values are preserved"""
@@ -501,9 +492,7 @@ class TestMoonshotConfig:
         assert result[0].get("reasoning_content") == "stored thinking"
         # The promoted key must be removed from provider_specific_fields to
         # avoid sending the value twice in the serialised request body
-        assert "reasoning_content" not in (
-            result[0].get("provider_specific_fields") or {}
-        )
+        assert "reasoning_content" not in (result[0].get("provider_specific_fields") or {})
 
     def test_reasoning_model_fill_called_from_transform_request(self):
         """transform_request injects reasoning_content end-to-end for reasoning models."""
@@ -603,10 +592,7 @@ class TestMoonshotConfig:
         result = config.fill_reasoning_content(messages)
 
         # reasoning_content should be preserved, not replaced with placeholder
-        assert (
-            result[0].get("reasoning_content")
-            == "<thinking>User wants weather</thinking>"
-        )
+        assert result[0].get("reasoning_content") == "<thinking>User wants weather</thinking>"
 
     def test_reasoning_content_preserved_in_multi_turn_flow(self):
         """reasoning_content is preserved through multi-turn conversation flow.
@@ -650,10 +636,7 @@ class TestMoonshotConfig:
         result = config.fill_reasoning_content(messages)
 
         # reasoning_content should be preserved in the assistant message
-        assert (
-            result[1].get("reasoning_content")
-            == "<thinking>Planning to call weather tool</thinking>"
-        )
+        assert result[1].get("reasoning_content") == "<thinking>Planning to call weather tool</thinking>"
 
 
 class TestKimiK26ModelRegistry:
@@ -695,3 +678,33 @@ class TestKimiK26ModelRegistry:
         """kimi-k2.6 should be assigned to the moonshot provider."""
         model_info = model_cost_map["moonshot/kimi-k2.6"]
         assert model_info["litellm_provider"] == "moonshot"
+
+
+class TestMoonshotResponseSchemaSupport:
+    """Every model currently live on api.moonshot.ai supports json_schema
+    response_format, which gates discovery via litellm.responses(). The flag
+    must be true so the capability is advertised honestly."""
+
+    LIVE_MODELS = [
+        "moonshot/kimi-k2.5",
+        "moonshot/kimi-k2.6",
+        "moonshot/moonshot-v1-8k",
+        "moonshot/moonshot-v1-32k",
+        "moonshot/moonshot-v1-128k",
+        "moonshot/moonshot-v1-8k-vision-preview",
+        "moonshot/moonshot-v1-32k-vision-preview",
+        "moonshot/moonshot-v1-128k-vision-preview",
+        "moonshot/moonshot-v1-auto",
+    ]
+
+    @pytest.fixture(autouse=True)
+    def model_cost_map(self):
+        return GetModelCostMap.load_local_model_cost_map()
+
+    @pytest.mark.parametrize("model", LIVE_MODELS)
+    def test_live_model_supports_response_schema(self, model, model_cost_map):
+        assert model_cost_map[model].get("supports_response_schema") is True
+
+    def test_supports_response_schema_utility_reports_true(self, model_cost_map, monkeypatch):
+        monkeypatch.setattr(litellm, "model_cost", model_cost_map)
+        assert litellm.utils.supports_response_schema(model="moonshot/kimi-k2.5") is True