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18 Best Stainless Alternatives & Competitors (2026)
The top alternatives to Stainless in the LLM Gateways space, compared on features, pricing, and what they're best at.
Updated March 10, 2026
Why look beyond Stainless?
Stainless automatically generates SDKs from OpenAPI specs. Creates production-quality type-safe SDKs in multiple languages.
Common reasons users explore alternatives
- Requires OpenAPI
- Limited customization
Top alternatives to Stainless
OpenRouter
One OpenAI-compatible API for 500+ models from 80+ providers
Cloudflare AI Gateway
Edge-deployed AI gateway
Vercel AI Gateway
One API key for hundreds of models
Portkey
Unified API across major providers
LiteLLM
OpenAI-compatible proxy for 140+ providers
Bifrost
OpenAI-compatible API for 1,000+ models from 20+ providers
Helicone
LLM observability and monitoring
Unify
Martian
Intelligent model routing based on prompt type
Kong AI Gateway
AI traffic management
Requesty
400+ model access
Apigee AI Gateway
Google Cloud AI traffic management
The Token Company
Token compression
TrueFoundry
AI Gateway with routing, fallbacks, rate limits, and budgets
OrcaRouter
orcarouter/auto adaptive routing per request
InWorld AI
Conditional routing with CEL expressions on request metadata
Orq.ai
AI gateway for 500+ models with fallbacks, retries, and load balancing
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