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Models

• Celeris-1 Decision
• Clairic
• Clef
• Clef-omni
• d1
• d1-ultra
• Decider 1
• Drex
• elephant-1
• GLiDE
• Jev
• Kai
• mammoth-1
• Mercury Decide
• Microsoft-Decision-1
• OpenAI Decisions API
• pplx-decider
• Solar Decide
• Span-01
• Span-02
• SubQ Snap
• Tev1
• CLM (open source, self-hosted)
• GLiNER2.5-Decide (open source, self-hosted)
• H2O-Lightning-31B (open source, self-hosted)
• H2O-Lightning-4B (open source, self-hosted)
• Jeffan-31b-1710 (open source, self-hosted)
• Kev (open source, self-hosted)
• Laya (open source, self-hosted)
• Quyet-1.0-Large (open source, self-hosted)
• Strands-Decider 2B (open source, self-hosted)
• Surogate Rune 26B-A4B (open source, self-hosted)
• Torchcast Decision 27B (open source, self-hosted)
• Von (open source, self-hosted)
• Jev examples
• Laya examples

Guides

• What is a System One (System 1) model? Decision and extraction models
• What is Jev AI? TypeSafe's decision model explained
• System One models vs LLMs
• Choice, Score and Noul: the three primitives
• How to build with System One decision models
• RLCD explained: Reinforcement Learning for Calibrated Decisions
• Is Jev just a zero-shot classifier?
• Jev speed and pricing
• How to get Jev API access
• Jev architecture: parameters, encoder or decoder, and no paper yet
• Clairic field types: text, number, date, list, estimate and forecast
• Jev 1.14: what changed, when jev-latest moves, and the danger zone
• Jev alternatives: hosted, open-source and local options compared
• Jev benchmarks: every public evaluation in one place
• Jev game demos: Doom, Pokemon, Mario, drones and more
• What is a decision model? AI decision models explained
• What is a System One extraction model? Extraction models explained

Integrations

• Jev with Claude Code: MCP servers, skills and routers
• Jev, Clef and Clairic with Cloudflare: Workers AI listing and setup
• Jev with Hermes Agent: plugins, skills and setup
• Jev with OpenAI Codex: per-turn model routing setup
• Jev on OpenRouter: model id, pricing and how to call it
• Jev with Pi: extensions, auto mode and routers
• Jev with Vercel: AI SDK provider and AI Gateway setup

Comparisons

• Clairic vs GLiNER: typed values against open-weights span extraction
• Clairic vs LLM structured outputs: an extraction model against JSON mode
• Clef vs Clairic: Cloudflare's decision model and its extraction model
• Jev vs BERT: which is better for text classification?
• Jev vs Clairic: a decision model and an extraction model
• Jev vs Claude: when a decision model beats an LLM
• Jev vs Clef: TypeSafe's decision model against Cloudflare's
• Jev vs GLiNER: typed decisions against span extraction
• Jev vs GPT: OpenAI against a decision model
• Jev vs Laya: hosted decision model or open weights?
• Jev vs Microsoft-Decision-1: same price, different evidence
• Jev vs OpenAI Decisions API: price, API and what's known
• Jev vs pplx-decider: TypeSafe's decision model against Perplexity's
• Microsoft-Decision-1 vs Clef: Microsoft's decision model against Cloudflare's
• Microsoft-Decision-1 vs OpenAI Decisions API: two hosted decision models
• Microsoft-Decision-1 vs pplx-decider: Microsoft's decision model against Perplexity's

Use cases

Recipes

• Ask four questions in one call and route in code
• Check a citation against its source with a noul
• Gate a destructive action on confidence
• Re-rank retrieved passages with a Score rubric
• Route a support ticket with one Choice
• Score a sales lead on four dimensions and weight them yourself
• Screen a message for prompt injection with Nouls
• Walk a taxonomy with one choice per level

Glossary

• Box
• Calibrated Probability
• Calibration
• Choice
• Classification model
• Composite scoring
• Confidence
• Confidence Gating
• Decision Model
• Estimate
• Expected calibration error
• Extraction model
• Forecast
• Hallucination
• Intent routing
• Jaggedness
• Jev
• Non-autoregressive
• Noul
• Null threshold
• p_null
• Question
• RLCD
• Score
• Span
• Speculative fan-out
• State
• Structured outputs
• System One Model
• System Two Model
• Thinking, Fast and Slow
• Typed output
• TypeSafe AI
• Zero-shot classification model
• Zero-shot classifier

Examples

Demos: every entry with a screen recording or GIF, most viewed first.