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Feature comparison of selected websites
	Fireworks AI Production-grade open-model serving.	OpenRouter One API for every LLM.	Together AI Fast, affordable open-model inference.
Rating	—	—	—
Pricing	Paid	Freemium	Paid
Open source
Category	LLM APIs	LLM APIs	LLM APIs
Key features	Fast open-model serving Function calling and JSON mode Fine-tuning support	One key for 300+ models OpenAI-compatible endpoint Free models and price routing	200+ open models Fine-tuning and dedicated endpoints OpenAI-compatible API
Pros	Tuned for production latency Good function-calling support	Swap models without changing code Free tier covers real prototyping	Cheap tokens at scale Strong model selection
Cons	Credit-based, not free Smaller community	Adds a small routing margin Free models are rate-limited	No always-free tier (credits) Less known than the majors
	Visit fireworks.ai	Visit openrouter.ai	Visit together.ai

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