Criterion OpenRouter Together AI
CategoryLLM APIs & Model PlatformsInference & Model Hosting
In one sentenceOne OpenAI-compatible API key for hundreds of models from many providers.Cloud platform for running, fine-tuning and training open models on serverless APIs or rented GPUs.
Problem it solvesManaging separate accounts, keys and SDKs for every model provider, and coping with provider outages.Running open models in production without buying and operating your own GPUs.
Free planYesNo
Developer APIYes — docsYes — docs
Open sourceNoNo
PlatformsWeb, REST APIWeb, REST API
Pricing (summary)No subscription: inference is billed at each provider's list price, with a platform fee of 5.5% (Standard) or 8% (Business) on credit purchases. A free plan offers 25+ free models with request caps; Enterprise is contract-based.
Checked 2026-10-19		Usage-based. Serverless models are billed per 1M tokens (for example gpt-oss-120B $0.15 / $0.60, Kimi K3 $3 / $15). Dedicated endpoints and GPU clusters are billed per GPU-hour, and fine-tuning per 1M training tokens with minimum charges.
Checked 2026-10-19
Strengths
  • Huge model catalogue
  • Provider list prices passed through
  • Free tier for testing
  • Broad open-model catalogue
  • Transparent GPU-hour pricing
  • Inference, fine-tuning and training in one place
Limitations
  • 5.5% (Standard) or 8% (Business) fee on credit purchases
  • Free model caps are low
  • Another intermediary in the data path
  • Free credit amount is not stated on the pricing page
  • Some hardware is contact-sales only
  • Pricing page shows two fine-tuning tables without explaining which applies