feat(provider): add Chuizi.AI as OpenAI-compatible provider

Add Chuizi.AI (https://chuizi.ai) as a provider. Chuizi.AI is a unified
AI gateway providing access to 100+ models across 16 providers through
a single OpenAI-compatible endpoint.

Changes:
- Add CHUIZI to LlmProviders enum
- Add to openai_compatible_endpoints, openai_compatible_providers,
  and openai_text_completion_compatible_providers lists
- Add endpoint detection for api.chuizi.ai/v1
- Add provider documentation page

Usage: model="chuizi/anthropic/claude-sonnet-4-6"
Auth: CHUIZI_API_KEY env var

docs/my-website/docs/providers/chuizi.md

@@ -0,0 +1,106 @@
+# Chuizi.AI
+
+## Overview
+
+| Property | Details |
+|-------|-------|
+| Description | Chuizi.AI is a unified AI gateway providing access to 100+ models across 16 providers through a single OpenAI-compatible endpoint. |
+| Provider Route on LiteLLM | `chuizi/` |
+| Link to Provider Doc | [Chuizi.AI Docs ↗](https://chuizi.ai/docs) |
+| Base URL | `https://api.chuizi.ai/v1` |
+| Supported Operations | [`/chat/completions`](#sample-usage), [`/completions`](#sample-usage), [`/embeddings`](#sample-usage) |
+
+<br />
+
+## Required Variables
+
+```python showLineNumbers title="Environment Variables"
+os.environ["CHUIZI_API_KEY"] = ""  # your Chuizi.AI API key
+```
+
+Get your API key from [app.chuizi.ai](https://app.chuizi.ai/login).
+
+## Usage - LiteLLM Python SDK
+
+### Non-streaming
+
+```python showLineNumbers title="Chuizi.AI Non-streaming"
+import os
+import litellm
+from litellm import completion
+
+os.environ["CHUIZI_API_KEY"] = ""  # your Chuizi.AI API key
+
+messages = [{"content": "What is the capital of France?", "role": "user"}]
+
+# Claude via Chuizi.AI
+response = completion(
+    model="chuizi/anthropic/claude-sonnet-4-6",
+    messages=messages
+)
+print(response)
+```
+
+### Streaming
+
+```python showLineNumbers title="Chuizi.AI Streaming"
+import os
+import litellm
+from litellm import completion
+
+os.environ["CHUIZI_API_KEY"] = ""
+
+messages = [{"content": "Write a haiku about AI", "role": "user"}]
+
+response = completion(
+    model="chuizi/openai/gpt-4.1",
+    messages=messages,
+    stream=True
+)
+
+for chunk in response:
+    print(chunk.choices[0].delta.content or "", end="")
+```
+
+## Usage - LiteLLM Proxy
+
+### Config
+
+```yaml showLineNumbers title="config.yaml"
+model_list:
+  - model_name: claude-sonnet
+    litellm_params:
+      model: chuizi/anthropic/claude-sonnet-4-6
+      api_key: os.environ/CHUIZI_API_KEY
+  - model_name: gpt-4.1
+    litellm_params:
+      model: chuizi/openai/gpt-4.1
+      api_key: os.environ/CHUIZI_API_KEY
+  - model_name: deepseek-chat
+    litellm_params:
+      model: chuizi/deepseek/deepseek-chat
+      api_key: os.environ/CHUIZI_API_KEY
+```
+
+### Start Proxy
+
+```bash
+litellm --config /path/to/config.yaml
+```
+
+## Available Models
+
+Models use `provider/model` naming. Some popular models:
+
+| Model | LiteLLM Route |
+|-------|--------------|
+| Claude Sonnet 4.6 | `chuizi/anthropic/claude-sonnet-4-6` |
+| Claude Opus 4.6 | `chuizi/anthropic/claude-opus-4-6` |
+| Claude Haiku 4.5 | `chuizi/anthropic/claude-haiku-4-5` |
+| GPT-4.1 | `chuizi/openai/gpt-4.1` |
+| o4-mini | `chuizi/openai/o4-mini` |
+| Gemini 2.5 Pro | `chuizi/google/gemini-2.5-pro` |
+| DeepSeek V3.2 | `chuizi/deepseek/deepseek-chat` |
+| DeepSeek R1 | `chuizi/deepseek/deepseek-r1` |
+
+See the full model list at [chuizi.ai/models](https://chuizi.ai/models).

litellm/constants.py

@@ -721,6 +721,7 @@ openai_compatible_endpoints: List = [
     "https://nano-gpt.com/api/v1",
     "https://api.poe.com/v1",
     "https://llm.chutes.ai/v1/",
+    "https://api.chuizi.ai/v1",
     "https://api.v0.dev/v1",
     "https://api.morphllm.com/v1",
     "https://api.lambda.ai/v1",
@@ -770,6 +771,7 @@ openai_compatible_providers: List = [
     "nano-gpt",  # Nano-GPT - JSON-configured provider
     "poe",  # Poe - JSON-configured provider
     "chutes",  # Chutes - JSON-configured provider
+    "chuizi",  # Chuizi.AI - unified AI gateway
     "featherless_ai",
     "nscale",
     "nebius",
@@ -805,6 +807,7 @@ openai_text_completion_compatible_providers: List = (
         "nano-gpt",
         "poe",
         "chutes",
+        "chuizi",
         "v0",
         "lambda_ai",
         "hyperbolic",

litellm/litellm_core_utils/get_llm_provider_logic.py

@@ -309,6 +309,9 @@ def get_llm_provider(  # noqa: PLR0915
                     elif endpoint == "https://llm.chutes.ai/v1/":
                         custom_llm_provider = "chutes"
                         dynamic_api_key = get_secret_str("CHUTES_API_KEY")
+                    elif endpoint == "https://api.chuizi.ai/v1":
+                        custom_llm_provider = "chuizi"
+                        dynamic_api_key = get_secret_str("CHUIZI_API_KEY")
                     elif endpoint == "https://api.v0.dev/v1":
                         custom_llm_provider = "v0"
                         dynamic_api_key = get_secret_str("V0_API_KEY")

litellm/types/utils.py

@@ -3291,6 +3291,7 @@ class LlmProviders(str, Enum):
     NANOGPT = "nano-gpt"
     POE = "poe"
     CHUTES = "chutes"
+    CHUIZI = "chuizi"
     XIAOMI_MIMO = "xiaomi_mimo"
     LITELLM_AGENT = "litellm_agent"
     CURSOR = "cursor"