OpenRouter

AI gateway: call many LLMs through one OpenAI-format interface.

Open-source Python SDK and proxy server (AI gateway) that exposes 100+ LLM providers through a single OpenAI-compatible API, with cost tracking, load balancing, fallbacks, caching, and guardrails. Self-host the proxy or use the managed cloud; a paid Enterprise tier adds SSO, audit logs, and support.

AI gateway with observability, guardrails, and governance.

A production AI gateway that gives apps and agents unified access to 1,600+ LLMs across providers behind a single API, with built-in observability, prompt management, guardrails, and governance. Portkey adds routing, caching, fallbacks, cost limits, PII redaction, RBAC, and an MCP gateway. Its core gateway is open-source; run it self-hosted/hybrid or use the managed cloud, which offers a free tier.

Hosted inference and fine-tuning for open-weights models.

Hosted inference and fine-tuning across hundreds of open-weights models (Llama, Mistral, DeepSeek, Qwen, etc.). Strong pricing for inference-at-scale; LoRA + full fine-tuning supported.

Fast inference + fine-tuning. Production deployments at scale.

Optimized inference platform for open-weights models with strong latency numbers and serverless + dedicated deployment options. Fine-tuning supported; vision and audio models alongside text.