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Engineered around prefix-cache stability — so token costs stay low across long sessions, and you can leave it running.
Tip
Cache stability isn't a feature you turn on; it's an invariant the loop is designed around. That's the whole reason Reasonix is DeepSeek-only — every layer is tuned to the byte-stable prefix-cache mechanic.
cd my-project
npx reasonix code # paste a DeepSeek API key on first run; persists afterRequires Node ≥ 22. Tested on macOS · Linux · Windows (PowerShell · Git Bash · Windows Terminal). Get a DeepSeek API key → · reasonix code --help for flags.
The loop is organized around four pillars. Each one solves a problem generic agent frameworks don't even see — because they were designed for a different cache mechanic.
Click any card to read the full architecture writeup → Pillar 1 · Pillar 2 · Pillar 3 · Pillar 4
| Reasonix | Claude Code | Cursor | Aider | |
|---|---|---|---|---|
| Backend | DeepSeek | Anthropic | OpenAI / Anthropic | any (OpenRouter) |
| License | MIT | closed | closed | Apache 2 |
| Cost profile | low per task | premium | subscription + use | varies |
| DeepSeek prefix-cache | engineered | not applicable | not applicable | incidental |
| Embedded web dashboard | yes | — | n/a (IDE) | — |
| Persistent per-workspace sessions | yes | partial | n/a | — |
| Plan mode · MCP · hooks · skills | yes | yes | yes | partial |
| Open community development | yes | — | — | yes |
For live cache-hit rates, costs, and methodology, see benchmarks/ — the numbers move with model pricing, so they live with the harness, not in the README.
- Architecture — the four pillars, cache-first loop, harvesting, scaffolds
- Benchmarks — τ-bench-lite harness, transcripts, cost methodology
- Website — getting started, dashboard mockup, TUI mockup
- Contributing — comment policy, error-handling rules, library-over-hand-rolled
- Code of Conduct · Security policy
Note
Reasonix is open source and community-developed. The contributors wall below isn't decoration — every avatar is a real PR that shipped.
Scoped starter tickets — each with background, code pointers, acceptance criteria, and hints — live under the good first issue label. Pick anything open.
Open Discussions — opinions wanted:
- #20 · CLI / TUI design — what's broken, what's missing, what would you change?
- #21 · Dashboard design — react against the proposed mockup
- #22 · Future feature wishlist — what would you build into Reasonix next?
Already using Reasonix and willing to help others discover it? Publish blog posts, articles, screenshots, talks, or videos to Show and tell. The project has no marketing budget — community word of mouth is how new users find it. Sustained advocates earn the badge below, displayed next to the contributors wall once awarded:
Before your first PR: read CONTRIBUTING.md — short, strict rules (comments, errors, libraries-over-hand-rolled). tests/comment-policy.test.ts enforces the comment ones; npm run verify is the pre-push gate. By participating you agree to the Code of Conduct. Security issues → SECURITY.md.
Important
Reasonix is opinionated. Some things it deliberately doesn't do — listed here so you can pick the right tool for your work.
- Multi-provider flexibility. DeepSeek-only on purpose. Coupling to one backend is the feature, not a limitation.
- IDE integration. Terminal-first. The diff lives in
git diff, the file tree inls. The dashboard is a companion, not a Cursor replacement. - Hardest-leaderboard reasoning. Claude Opus still wins some benchmarks. DeepSeek is competitive on coding; if your work is "solve this PhD proof" rather than "fix this auth bug," start with Claude.
- Air-gapped / fully-free. Reasonix needs a paid DeepSeek API key. For air-gapped or zero-cost runs see Aider + Ollama or Continue.
MIT — see LICENSE
Built by the community at esengine/reasonix