OpenRouter
The quiet infrastructure play on this list. OpenRouter aggregates 400+ large language models from every major provider into a single, OpenAI-compatible API, letting engineering teams route between models without changing a line of code.
Route summarisation to Claude and classification to GPT in the same pipeline. Swap providers by changing a string, not your codebase. Works with any code already written for ChatGPT.
No markup on provider pricing, you pay exactly what each model charges, plus a 5.5% platform fee on pay-as-you-go usage. Free-tier models available with rate limits.
Teams running multiple AI models in production who want a single API layer.
