System One vs System Two for Jev AI Tools
Kahneman described fast reflexive judgments and slow deliberative thought. Jev AI tools compositions apply the fast layer as typed Choice / Score / Noul answers; generative LLMs remain the writing and deep-reasoning layer. This site is an independent third-party directory and is not affiliated with, endorsed by, or operated by TypeSafe AI.
SYSTEM ONE — JEV AI TOOLS
Fast Reflex Engine
Does not write prose. Returns constrained answers you branch on in code.
- Official end-to-end latency range: ~70–500ms; many calls land near ~100ms from US West Coast (source: typesafe.ai / TypeSafe public materials, 2026-09).
- Official list price: $0.042 / 1M input tokens; output tokens free (source: typesafe.ai, as of 2026-09).
- Official primitives documented at docs.typesafe.ai.
SYSTEM TWO — GENERATIVE LLMS
Deliberative Thought
Autoregressive generation for essays, research, and code synthesis.
- Often multi-second latency for the same snap-judgment task shape.
- Output tokens billed for every generated word and JSON character.
- Schema drift and truncated JSON remain failure modes without adapters.
Browse concrete compositions in the Jev AI tools directory.