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+---
+slug: gemini_3_1_pro
+title: "DAY 0 Support: Gemini 3.1 Pro on LiteLLM"
+date: 2025-12-17T10:00:00
+authors:
+  - name: Sameer Kankute
+    title: SWE @ LiteLLM (LLM Translation)
+    url: https://www.linkedin.com/in/sameer-kankute/
+    image_url: https://pbs.twimg.com/profile_images/2001352686994907136/ONgNuSk5_400x400.jpg
+  - name: Krrish Dholakia
+    title: "CEO, LiteLLM"
+    url: https://www.linkedin.com/in/krish-d/
+    image_url: https://pbs.twimg.com/profile_images/1298587542745358340/DZv3Oj-h_400x400.jpg
+  - name: Ishaan Jaff
+    title: "CTO, LiteLLM"
+    url: https://www.linkedin.com/in/reffajnaahsi/
+    image_url: https://pbs.twimg.com/profile_images/1613813310264340481/lz54oEiB_400x400.jpg
+description: "Guide to using Gemini 3.1 Pro on LiteLLM Proxy and SDK with day 0 support."
+tags: [gemini, day 0 support, llms]
+hide_table_of_contents: false
+---
+
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Gemini 3.1 Pro Day 0 Support 
+
+LiteLLM now supports `gemini-3.1-pro-preview` and all the new API changes along with it.
+
+:::note
+If you only want cost tracking, you need no change in your current Litellm version. But if you want the support for new features introduced along with it like thinking levels, you will need to use (version here) or above.
+:::
+
+## Deploy this version
+
+<Tabs>
+<TabItem value="docker" label="Docker">
+
+``` showLineNumbers title="docker run litellm"
+docker run \
+-e STORE_MODEL_IN_DB=True \
+-p 4000:4000 \
+ghcr.io/berriai/litellm:main-v1.80.8-stable.1
+```
+
+</TabItem>
+
+<TabItem value="pip" label="Pip">
+
+``` showLineNumbers title="pip install litellm"
+pip install litellm==1.80.8.post1
+```
+
+</TabItem>
+</Tabs>
+
+## What's New
+
+### 1. New Thinking Levels: `thinkingLevel` with MINIMAL & MEDIUM
+
+Gemini 3.1 Pro introduces support for **medium** thinking level
+
+LiteLLM automatically maps the OpenAI `reasoning_effort` parameter to Gemini's `thinkingLevel`, so you can use familiar `reasoning_effort` values (`minimal`, `low`, `medium`, `high`) without changing your code!
+
+---
+## Supported Endpoints
+
+LiteLLM provides **full end-to-end support** for Gemini 3 Flash on:
+
+- ✅ `/v1/chat/completions` - OpenAI-compatible chat completions endpoint
+- ✅ `/v1/responses` - OpenAI Responses API endpoint (streaming and non-streaming)
+- ✅ [`/v1/messages`](../../docs/anthropic_unified) - Anthropic-compatible messages endpoint
+- ✅ `/v1/generateContent` – [Google Gemini API](../../docs/generateContent.md) compatible endpoint 
+
+All endpoints support:
+- Streaming and non-streaming responses
+- Function calling with thought signatures
+- Multi-turn conversations
+- All Gemini 3-specific features
+- Converstion of provider specific thinking related param to thinkingLevel
+
+## Quick Start
+
+<Tabs>
+<TabItem value="sdk" label="SDK">
+
+**Basic Usage with MEDIUM thinking (NEW)**
+
+```python
+from litellm import completion
+
+# No need to make any changes to your code as we map openai reasoning param to thinkingLevel
+response = completion(
+    model="gemini/gemini-3.1-pro-preview",
+    messages=[{"role": "user", "content": "Solve this complex math problem: 25 * 4 + 10"}],
+    reasoning_effort="medium",  # NEW: MEDIUM thinking level
+)
+
+print(response.choices[0].message.content)
+```
+
+</TabItem>
+
+<TabItem value="proxy" label="PROXY">
+
+**1. Setup config.yaml**
+
+```yaml
+model_list:
+  - model_name: gemini-3.1-pro-preview
+    litellm_params:
+      model: gemini/gemini-3.1-pro-preview
+      api_key: os.environ/GEMINI_API_KEY
+```
+
+**2. Start proxy**
+
+```bash
+litellm --config /path/to/config.yaml
+```
+
+**3. Call with MEDIUM thinking**
+
+```bash
+curl -X POST http://localhost:4000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer <YOUR-LITELLM-KEY>" \
+  -d '{
+    "model": "gemini-3.1-pro-preview",
+    "messages": [{"role": "user", "content": "Complex reasoning task"}],
+    "reasoning_effort": "medium"
+  }'
+``'
+
+</TabItem>
+</Tabs>
+
+---
+
+## `reasoning_effort` Mapping for Gemini 3+
+
+| reasoning_effort | thinking_level | 
+|------------------|----------------|
+| `minimal` | `minimal` |
+| `low` | `low` |
+| `medium` | `medium` |
+| `high` | `high` |
+| `disable` | `minimal` |
+| `none` | `minimal` |
+
diff --git a/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py b/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
index daa82a46bdc..cf3461a9960 100644
--- a/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
+++ b/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py
@@ -767,14 +767,7 @@ class VertexGeminiConfig(VertexAIBaseConfig, BaseConfig):
         elif reasoning_effort == "low":
             return {"thinkingLevel": "low", "includeThoughts": True}
         elif reasoning_effort == "medium":
-            # For gemini-3-flash-preview, medium maps to "medium", otherwise "high"
-            if is_gemini3flash:
                 return {"thinkingLevel": "medium", "includeThoughts": True}
-            else:
-                return {
-                    "thinkingLevel": "high",
-                    "includeThoughts": True,
-                }  # medium is not out yet for other models
         elif reasoning_effort == "high":
             return {"thinkingLevel": "high", "includeThoughts": True}
         elif reasoning_effort == "disable":