DeepSeek-Reasonix is an open-source terminal coding agent — a single static Go binary that runs agentic coding loops in your shell, built natively for DeepSeek’s V4-Pro and V4-Flash models. It just passed 30,000 GitHub stars, adding 883 in a single day to top GitHub Trending.
Why it’s exploding now
Timing. DeepSeek shipped V4-Flash-0731 on July 31: $0.14 per million input tokens, $0.0028 on a cache hit. Reasonix is engineered around that cache — long sessions hold 90%+ cache-hit rates, so input costs collapse to roughly one fifth. Generic harnesses that just point at the DeepSeek API don’t get this; Reasonix natively adapts to DeepSeek’s sparse attention and prefix caching, which makes it faster and dramatically cheaper. Agentic coding at a fraction of a Claude Code bill is the entire pitch, and it lands.
How you actually use it
It’s a CLI, MIT-licensed. Install via npm or Homebrew, drop a DeepSeek API key into reasonix.toml, point it at a repo. Everything is config-driven: any OpenAI-compatible endpoint works, plugins attach over MCP-compatible JSON-RPC, and a dual-model mode splits planner and executor into separate cache-stable sessions. Typical move: leave it running on a big refactor overnight without watching the meter.
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