OpenRouter

OpenRouter is a unified LLM API gateway and marketplace that provides a single API endpoint to access hundreds of models from dozens of AI providers — including OpenAI, Anthropic, Google, Meta, Mistral, and a growing roster of open-weight models. It intelligently routes requests across providers, tracks real-time inference costs, and serves as a widely-used proxy for benchmarking open-weight model pricing and adoption. The platform has become a key industry data source, notably tracking the rapid rise of Chinese open-weight models (e.g., DeepSeek) from roughly 1.2% to nearly 30% of weekly token volume between late 2024 and early 2025.