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External jump (enhancement)
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Strengths
- One API Key to access 200+ AI models
- Automatic routing to the cheapest or fastest available provider
- Real-time price comparison, transparent fee display
- Support OpenAI compatible API format
- Some models are completely free
Best for
- Unified management of API calls for multiple AI models
- Automatically select the cheapest model provider
- Test and compare the output of different models
- Build applications that support multi-model switching
- Access models that cannot be called directly in China
quick start
OpenRouter uses an OpenAI compatible format, requiring little modification to existing code.
Scenario
Call any model
Prompt example
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="your-openrouter-key"
)
# You can call any model, just modify the model parameters
response = client.chat.completions.create(
model="anthropic/claude-3.5-sonnet", # or any other model
messages=[{"role": "user", "content": "Hello"}],
extra_headers={
"HTTP-Referer": "https://your-site.com",
"X-Title": "Your App Name"
}
)
print(response.choices[0].message.content)
# Just change one line to switch models
# model="openai/gpt-4o"
# model="google/gemini-pro-1.5"
# model="meta-llama/llama-3.1-70b-instruct"Output / what to expect
One API Key to access all models,
To switch models, just modify the model parameters.
Billing is managed in OpenRouter.
Tips
At openrouter.ai/models you can view real-time prices for all models and choose the one that suits you best.
Scenario
Use free models
Prompt example
Free model on #OpenRouter (2025)
free_models = [
"google/gemini-flash-1.5-8b", # Google Free
"meta-llama/llama-3.2-3b-instruct:free", # Meta free
"mistralai/mistral-7b-instruct:free", #Mistral free
"deepseek/deepseek-r1:free", # DeepSeek free
]
# Use free models
response = client.chat.completions.create(
model="deepseek/deepseek-r1:free",
messages=[{"role": "user", "content": "Explaining Machine Learning"}]
)Output / what to expect
Free models have rate limits,
But it is completely sufficient for testing and low-frequency use.
DeepSeek R1 free version is of high quality.
Tips
Free models usually have stricter rate limits, and paid models are recommended for production applications.