ModelSystem.One
Decision Models: AI that decides, not writes.
modelsystem.one is a curated catalog of System One / Decision Models — AI systems that return typed decisions (choice, score, boolean) with calibrated probabilities, instead of free-form chat text.
This repository is the public contribution surface for the project (issues, PRs, discussions). The website application source lives in a separate private repository.
What is a System One model?
Inspired by Kahneman’s Thinking, Fast and Slow:
| Traditional LLMs | Decision Models (System One) | |
|---|---|---|
| Output | Free text | Typed decision + probability |
| Latency | Seconds | Milliseconds |
| Best for | Generation, reasoning | Classification, routing, scoring, guardrails |
Today the public category is led by Jev (TypeSafe AI). This catalog exists to track every entrant as the category grows.
Site map
| Path | Purpose |
|---|---|
| / | Home — category intro + featured model |
| /models | Catalog |
| /quadrant | Maturity × Capability evaluation |
| /learn | System 1 vs System 2 applied to AI |
| /guides | Integration tutorials |
| /news | Category news + RSS |
| /spec | Catalog inclusion criteria |
Also available in Portuguese: modelsystem.one/pt-br.
How to contribute
We welcome:
- New models that meet the catalog spec
- Corrections to specs, pricing, status, or links
- Documentation / learn / guide improvements (content proposals)
- Bug reports about the public site
Start here:
- Read CONTRIBUTING.md
- Open an issue: New issue
- Or submit a PR against this repo (content / meta changes)
Do not open PRs expecting the private application source to be here — this repo is for contributions and project meta only.
Inclusion criteria (summary)
- Primary interface returns typed decisions (not free text)
- Publicly available (GA, beta, or waitlist)
- Minimum API documentation
Details: modelsystem.one/spec
Topics (GitHub)
Suggested repository topics for discoverability:
ai · system-one · decision-models · machine-learning · llm · catalog · typed-decisions · calibrated-probability · developer-tools · modelsystem
License
MIT — see LICENSE.
Site content and trademarks of third parties (e.g. TypeSafe, Jev) remain with their owners. ModelSystem.One is an independent catalog and is not affiliated with those vendors.
Links
- Website: https://modelsystem.one
- Terms: https://modelsystem.one/terms
- Privacy: https://modelsystem.one/privacy
- Issues: https://github.com/fabricioctelles/modelsystem/issues