Why You Need an AI API Gateway
If your app uses AI APIs, you have probably hit these problems:
- Costs spiral as usage grows
- Single vendor lock-in makes you fragile
- Rate limits hit at the worst times
- No visibility into which requests cost the most
An AI API gateway solves all four.
Architecture Overview
Your App sends an OpenAI-compatible request to the Gateway. The Gateway has three layers:
- Router detects task type and picks the best model
- Balancer manages rate limits and load distribution
- Fallback handles failures with automatic retries
The request then goes to the best available model.
The Router
The smart router classifies each request:
- Simple Q and A -> DeepSeek V3 ($0.27/M tokens)
- Code generation -> Claude Sonnet 4 ($3/M tokens)
- Creative writing -> GPT-5.2 ($2.50/M tokens)
- Long context -> Gemini 2.5 Pro ($1.25/M tokens)
The Fallback Chain
When the primary model fails, the gateway automatically falls back:
Claude Sonnet 4 -> GPT-5.2 -> DeepSeek V3 -> Gemini 2.5 Pro
Zero downtime from model outages in 6 months of production.
Real Production Results
- 50% cost reduction vs single provider
- Zero downtime from model outages
- 30% faster responses (best model per task)
- 99.8% success rate (fallback chain)
Try It
ChinaLLM is a free-to-start OpenAI-compatible gateway. Just change your base URL.
Originally published on ChinaLLM Blog
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