AIsa LLM Router

View on GitHub -> One gateway for many LLMs. Route agent requests across OpenAI-compatible models through AIsa with a single API key.

Install

First, install the AIsa CLI if you have not already:

npm install -g @aisa-one/cli

Then install the skill:

aisa skills install llm-router

What can agents do with it?

Model matching

Pick a model based on task type and constraints.

Provider coverage

Route across GPT, Claude, Gemini, Qwen, DeepSeek, Grok, and more.

Cost-aware routing

Choose cheaper models when quality needs allow it.

Fallback planning

Suggest alternates when a model is unavailable.

🔥 What Can You Do?

Multi-Model Chat

"Chat with GPT-4 for reasoning, switch to Claude for creative writing"

Model Comparison

"Compare responses from GPT-4, Claude, and Gemini for the same question"

Vision Analysis

"Analyze this image with GPT-4o - what objects are in it?"

Cost Optimization

"Route simple queries to fast/cheap models, complex queries to GPT-4"

Fallback Strategy

"If GPT-4 fails, automatically try Claude, then Gemini"

Why LLM Router?

Feature	LLM Router	Direct APIs
API Keys	1	10+
SDK Compatibility	OpenAI SDK	Multiple SDKs
Billing	Unified	Per-provider
Model Switching	Change string	Code rewrite
Fallback Routing	Built-in	DIY
Cost Tracking	Unified	Fragmented

Supported Model Families

Family	Developer	Example Models
GPT	OpenAI	gpt-4.1, gpt-4o, gpt-4o-mini, o1, o1-mini, o3-mini
Claude	Anthropic	claude-3-5-sonnet, claude-3-opus, claude-3-sonnet
Gemini	Google	gemini-3-pro-preview, gemini-3.5-flash
Qwen	Alibaba	qwen-max, qwen-plus, qwen2.5-72b-instruct
Deepseek	Deepseek	deepseek-chat, deepseek-coder, deepseek-v3, deepseek-r1
Grok	xAI	grok-2, grok-beta

Note: Model availability may vary. Check console.aisa.one/pricing for the full list of currently available models and pricing.

Quick Start

export AISA_API_KEY="your-key"

API Endpoints

OpenAI-Compatible Chat Completions

POST https://api.aisa.one/v1/chat/completions

Request

curl -X POST "https://api.aisa.one/v1/chat/completions" \
  -H "Authorization: Bearer $AISA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4.1",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "Explain quantum computing in simple terms."}
    ],
    "temperature": 0.7,
    "max_tokens": 1000
  }'

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Model identifier (e.g., `gpt-4.1`, `claude-3-sonnet`)
`messages`	array	Yes	Conversation messages
`temperature`	number	No	Randomness (0-2, default: 1)
`max_tokens`	integer	No	Maximum response tokens
`stream`	boolean	No	Enable streaming (default: false)
`top_p`	number	No	Nucleus sampling (0-1)
`frequency_penalty`	number	No	Frequency penalty (-2 to 2)
`presence_penalty`	number	No	Presence penalty (-2 to 2)
`stop`	string/array	No	Stop sequences

Message Format

{
  "role": "user|assistant|system",
  "content": "message text or array for multimodal"
}

Response

{
  "id": "chatcmpl-xxx",
  "object": "chat.completion",
  "created": 1234567890,
  "model": "gpt-4.1",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Quantum computing uses..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 50,
    "completion_tokens": 200,
    "total_tokens": 250,
    "cost": 0.0025
  }
}

Streaming Response

curl -X POST "https://api.aisa.one/v1/chat/completions" \
  -H "Authorization: Bearer $AISA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-3-sonnet",
    "messages": [{"role": "user", "content": "Write a poem about AI."}],
    "stream": true
  }'

Streaming returns Server-Sent Events (SSE):

data: {"id":"chatcmpl-xxx","choices":[{"delta":{"content":"In"}}]}
data: {"id":"chatcmpl-xxx","choices":[{"delta":{"content":" circuits"}}]}
...
data: [DONE]

Vision / Image Analysis

Analyze images by passing image URLs or base64 data:

curl -X POST "https://api.aisa.one/v1/chat/completions" \
  -H "Authorization: Bearer $AISA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "text", "text": "What is in this image?"},
          {"type": "image_url", "image_url": {"url": "https://example.com/image.jpg"}}
        ]
      }
    ]
  }'

Function Calling

Enable tools/functions for structured outputs:

curl -X POST "https://api.aisa.one/v1/chat/completions" \
  -H "Authorization: Bearer $AISA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4.1",
    "messages": [{"role": "user", "content": "What is the weather in Tokyo?"}],
    "functions": [
      {
        "name": "get_weather",
        "description": "Get current weather for a location",
        "parameters": {
          "type": "object",
          "properties": {
            "location": {"type": "string", "description": "City name"},
            "unit": {"type": "string", "enum": ["celsius", "fahrenheit"]}
          },
          "required": ["location"]
        }
      }
    ],
    "function_call": "auto"
  }'

Google Gemini Format

For Gemini models, you can also use the native format:

POST https://api.aisa.one/v1beta/models/{model}:generateContent

curl -X POST "https://api.aisa.one/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "Authorization: Bearer $AISA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [{"text": "Explain machine learning."}]
      }
    ],
    "generationConfig": {
      "temperature": 0.7,
      "maxOutputTokens": 1000
    }
  }'

Python Client

Installation

No installation required - uses standard library only.

CLI Usage

# Basic completion
python3 scripts/llm_router_client.py chat --model gpt-4.1 --message "Hello, world!"

# With system prompt
python3 scripts/llm_router_client.py chat --model claude-3-sonnet --system "You are a poet" --message "Write about the moon"

# Streaming
python3 scripts/llm_router_client.py chat --model gpt-4o --message "Tell me a story" --stream

# Multi-turn conversation
python3 scripts/llm_router_client.py chat --model qwen-max --messages '[{"role":"user","content":"Hi"},{"role":"assistant","content":"Hello!"},{"role":"user","content":"How are you?"}]'

# Vision analysis
python3 scripts/llm_router_client.py vision --model gpt-4o --image "https://example.com/image.jpg" --prompt "Describe this image"

# List supported models
python3 scripts/llm_router_client.py models

# Compare models
python3 scripts/llm_router_client.py compare --models "gpt-4.1,claude-3-sonnet,gemini-3.5-flash" --message "What is 2+2?"

Python SDK Usage

from llm_router_client import LLMRouterClient

client = LLMRouterClient()  # Uses AISA_API_KEY env var

# Simple chat
response = client.chat(
    model="gpt-4.1",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response["choices"][0]["message"]["content"])

# With options
response = client.chat(
    model="claude-3-sonnet",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain relativity."}
    ],
    temperature=0.7,
    max_tokens=500
)

# Streaming
for chunk in client.chat_stream(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Write a story."}]
):
    print(chunk, end="", flush=True)

# Vision
response = client.vision(
    model="gpt-4o",
    image_url="https://example.com/image.jpg",
    prompt="What's in this image?"
)

# Compare models
results = client.compare_models(
    models=["gpt-4.1", "claude-3-sonnet", "gemini-3.5-flash"],
    message="Explain quantum computing"
)
for model, result in results.items():
    print(f"{model}: {result['response'][:100]}...")

Use Cases

1. Cost-Optimized Routing

Use cheaper models for simple tasks:

def smart_route(message: str) -> str:
    # Simple queries -> fast/cheap model
    if len(message) < 50:
        model = "gpt-3.5-turbo"
    # Complex reasoning -> powerful model
    else:
        model = "gpt-4.1"
    
    return client.chat(model=model, messages=[{"role": "user", "content": message}])

2. Fallback Strategy

Automatic fallback on failure:

def chat_with_fallback(message: str) -> str:
    models = ["gpt-4.1", "claude-3-sonnet", "gemini-3.5-flash"]
    
    for model in models:
        try:
            return client.chat(model=model, messages=[{"role": "user", "content": message}])
        except Exception:
            continue
    
    raise Exception("All models failed")

3. Model A/B Testing

Compare model outputs:

results = client.compare_models(
    models=["gpt-4.1", "claude-3-opus"],
    message="Analyze this quarterly report..."
)

# Log for analysis
for model, result in results.items():
    log_response(model=model, latency=result["latency"], cost=result["cost"])

4. Specialized Model Selection

Choose the best model for each task:

MODEL_MAP = {
    "code": "deepseek-coder",
    "creative": "claude-3-opus",
    "fast": "gpt-3.5-turbo",
    "vision": "gpt-4o",
    "chinese": "qwen-max",
    "reasoning": "gpt-4.1"
}

def route_by_task(task_type: str, message: str) -> str:
    model = MODEL_MAP.get(task_type, "gpt-4.1")
    return client.chat(model=model, messages=[{"role": "user", "content": message}])

Error Handling

Errors return JSON with error field:

{
  "error": {
    "code": "model_not_found",
    "message": "Model 'xyz' is not available"
  }
}

Common error codes:

401 - Invalid or missing API key
402 - Insufficient credits
404 - Model not found
429 - Rate limit exceeded
500 - Server error

Best Practices

Use streaming for long responses to improve UX
Set max_tokens to control costs
Implement fallback for production reliability
Cache responses for repeated queries
Monitor usage via response metadata
Use appropriate models - don’t use GPT-4 for simple tasks

OpenAI SDK Compatibility

Just change the base URL and key:

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["AISA_API_KEY"],
    base_url="https://api.aisa.one/v1"
)

response = client.chat.completions.create(
    model="gpt-4.1",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

Pricing

Token-based pricing varies by model. Check console.aisa.one/pricing for current rates.

Model Family	Approximate Cost
GPT-4.1 / GPT-4o	~$0.01 / 1K tokens
Claude-3-Sonnet	~$0.01 / 1K tokens
Gemini-2.0-Flash	~$0.001 / 1K tokens
Qwen-Max	~$0.005 / 1K tokens
DeepSeek-V3	~$0.002 / 1K tokens

Every response includes usage.cost and usage.credits_remaining.

Get Started

Sign up at aisa.one
Get your API key from the dashboard
Add credits (pay-as-you-go)
Set environment variable: export AISA_API_KEY="your-key"

Full API Reference

See API Reference for complete endpoint documentation.

Get started

Sign up at aisa.one (new accounts start with $2 free credit).
Generate an API key from the console.

Set your key and install the skill:

export AISA_API_KEY="your-key"
npm install -g @aisa-one/cli
aisa skills install llm-router

Start a new agent session so the runtime loads the updated skill instructions.

Model Catalog

Browse supported model IDs and families.

Compare models

Compare models before routing production traffic.

AIsa CN-LLM Route

Chinese-language model routing.

​Install

​What can agents do with it?

Model matching

Provider coverage

Cost-aware routing

Fallback planning

​🔥 What Can You Do?

​Multi-Model Chat

​Model Comparison

​Vision Analysis

​Cost Optimization

​Fallback Strategy

​Why LLM Router?

​Supported Model Families

​Quick Start

​API Endpoints

​OpenAI-Compatible Chat Completions

​Request

​Parameters

​Message Format

​Response

​Streaming Response

​Vision / Image Analysis

​Function Calling

​Google Gemini Format

​Python Client

​Installation

​CLI Usage

​Python SDK Usage

​Use Cases

​1. Cost-Optimized Routing

​2. Fallback Strategy

​3. Model A/B Testing

​4. Specialized Model Selection

​Error Handling

​Best Practices

​OpenAI SDK Compatibility

​Pricing

​Get Started

​Full API Reference

​Get started

​Related