Weave Router - Open-source model routing for coding agents
Show HN: Open-source model routing for coding agents at Astra-level performance
Weave Router is an open-source model router that plugs into any coding agent, like Claude Code or Codex, and intelligently switches between LLMs to match the task. It uses an ensemble approach to deliver frontier-level performance at a fraction of the cost. Weave Router 2.0 matches GPT-6 Astra on Terminal Bench 4.0 and SWE Atlas, while cutting costs by nearly half and running tasks over twice as fast. Built with a hidden Markov model and classifier for smart routing, it's available on GitHub or as a hosted service.
Matching frontier model performance was a huge milestone for our routing model, and in my opinion validates our initial hypothesis that an ensemble of models can do better than any single model ever could.