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+---
+slug: gemini_3_flash
+title: "DAY 0 Support: Gemini 3 Flash on LiteLLM"
+date: 2025-11-19T10:00:00
+authors:
+  - name: Sameer Kankute
+    title: SWE @ LiteLLM (LLM Translation)
+    url: https://www.linkedin.com/in/sameer-kankute/
+    image_url: https://media.licdn.com/dms/image/v2/D4D03AQHB_loQYd5gjg/profile-displayphoto-shrink_800_800/profile-displayphoto-shrink_800_800/0/1719137160975?e=1765411200&v=beta&t=c8396f--_lH6Fb_pVvx_jGholPfcl0bvwmNynbNdnII
+  - 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
+tags: [gemini, day 0 support, llms]
+hide_table_of_contents: false
+---
+
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Gemini 3 Flash Day 0 Support 
+
+LiteLLM now supports `gemini-3-flash` and all the new API changes along with it.
+
+## What's New
+
+### 1. New Thinking Levels: `thinkingLevel` with MINIMAL & MEDIUM
+
+Gemini 3 Flash introduces granular thinking control with `thinkingLevel` instead of `thinkingBudget`.
+- **MINIMAL**: Ultra-lightweight thinking for fast responses
+- **MEDIUM**: Balanced thinking for complex reasoning  
+- **HIGH**: Maximum reasoning depth
+
+### 2. Thought Signatures
+
+Like `gemini-3-pro`, this model also includes thought signatures for tool calls. LiteLLM handles signature extraction and embedding internally. [Learn more about thought signatures](../gemini_3/index.md#thought-signatures).
+
+---
+## 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](https://cloud.google.com/vertex-ai/docs/generative-ai/model-reference/gemini#rest) compatible endpoint (for code, see: `client.models.generate_content(...)`)
+
+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-3-flash",
+    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-flash
+    litellm_params:
+      model: gemini/gemini-3-flash
+      api_key: os.environ/GEMINI_API_KEY
+```
+
+**2. Start proxy**
+
+```bash
+litellm --config /path/to/config.yaml
+```
+
+**3. Call with MEDIUM thinking**
+
+```bash
+curl http://localhost:4000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer <YOUR-LITELLM-KEY>" \
+  -d '{
+    "model": "gemini-3-flash-reasoning",
+    "messages": [{"role": "user", "content": "Complex reasoning task"}],
+    "reasoning_effort": "medium"
+  }'
+```
+
+</TabItem>
+</Tabs>
+
+---
+
+## All `reasoning_effort` Levels
+
+<Tabs>
+<TabItem value="minimal" label="MINIMAL">
+
+**Ultra-fast, minimal reasoning**
+
+```python
+from litellm import completion
+
+response = completion(
+    model="gemini-3-flash",
+    messages=[{"role": "user", "content": "What's 2+2?"}],
+    reasoning_effort="minimal",
+)
+```
+
+</TabItem>
+
+<TabItem value="low" label="LOW">
+
+**Simple instruction following**
+
+```python
+response = completion(
+    model="gemini-3-flash",
+    messages=[{"role": "user", "content": "Write a haiku about coding"}],
+    reasoning_effort="low",
+)
+```
+
+</TabItem>
+
+<TabItem value="medium" label="MEDIUM (NEW)">
+
+**Balanced reasoning for complex tasks** ✨
+
+```python
+response = completion(
+    model="gemini-3-flash",
+    messages=[{"role": "user", "content": "Analyze this dataset and find patterns"}],
+    reasoning_effort="medium",  # NEW!
+)
+```
+
+</TabItem>
+
+<TabItem value="high" label="HIGH">
+
+**Maximum reasoning depth**
+
+```python
+response = completion(
+    model="gemini-3-flash",
+    messages=[{"role": "user", "content": "Prove this mathematical theorem"}],
+    reasoning_effort="high",
+)
+```
+
+</TabItem>
+</Tabs>
+
+---
+
+## Key Features
+
+✅ **Thinking Levels**: MINIMAL, LOW, MEDIUM, HIGH  
+✅ **Thought Signatures**: Track reasoning with unique identifiers  
+✅ **Seamless Integration**: Works with existing OpenAI-compatible client  
+✅ **Backward Compatible**: Gemini 2.5 models continue using `thinkingBudget`  
+
+---
+
+## Installation
+
+```bash
+pip install litellm --upgrade
+```
+
+```python
+import litellm
+from litellm import completion
+
+response = completion(
+    model="gemini-3-flash",
+    messages=[{"role": "user", "content": "Your question here"}],
+    reasoning_effort="medium",  # Use MEDIUM thinking
+)
+print(response)
+```
+
+## `reasoning_effort` Mapping for Gemini 3+
+
+| reasoning_effort | thinking_level | 
+|------------------|----------------|
+| `minimal` | `minimal` |
+| `low` | `low` |
+| `medium` | `medium` |
+| `high` | `high` |
+| `disable` | `minimal` |
+| `none` | `minimal` |
+