Jev Guides
Hands-on tutorials for the Jev judgment model: concepts, API calls, channels, confidence handling, cost and troubleshooting.
Jev API Channels: Official API vs OpenRouter (How to Choose)
Official Jev API vs OpenRouter compared: integration effort, billing, update speed and migration cost, plus a channel adapter and a migration runbook.
Updated 2026-09-21
Jev Cost and Latency: Real Pricing Math and Budgets
Jev cost and latency explained: real math at $0.0462 per 1M input tokens, LLM cost comparison, latency budgets and batching tips.
Updated 2026-09-21
Jev Troubleshooting: Common Errors and Proven Fixes
Jev troubleshooting guide: 401 and 404 model errors, 429 rate limits, JSON parse failures and confidence anomalies, with proven fixes.
Updated 2026-09-21
Jev API Tutorial: Make Your First Call in 10 Minutes
Jev API tutorial: step-by-step runbook from account to first call, copy-paste curl and Python examples, full request/response field walkthrough, failure mode table, cost measurement, and production checklist.
Updated 2026-09-24
How to Use Jev with Coding Agents (Cursor, Claude Code)
Use Jev API with coding agents like Cursor and Claude Code: skill file layout, complete worked example, retry rules, debugging a skill that won't trigger, and six anti-patterns.
Updated 2026-09-25
Jev Confidence Scores and Fallback Strategies That Work
Set Jev confidence thresholds that work: low-confidence fallback to LLMs, humans or retries, plus monitoring tips for production. Covers cold-start tuning, batch patterns, and anti-patterns to avoid.
Updated 2026-09-26
Jev AI vs LLMs: A Complete Comparison of Judgment vs Chat Models
Jev AI vs LLMs: capability boundaries, cost model, latency, determinism, explainability, regression testing, and a practical selection checklist for every pipeline step.
Updated 2026-09-27
Designing Jev Questions and State: A Practical Guide
Design stable Jev questions: option enumeration, boundary definitions, few-shot examples and how to pass context state between calls.
Updated 2026-09-28
Jev Model's Three Primitives: Judgment, Choice, Scoring
Jev's three primitives explained: judgment, choice and scoring questions, their request and response shapes, boundary conditions, cost trade-offs, and when to use each.
Updated 2026-09-29
How to Get a Jev API Key and Set Up Your Environment
How to get a Jev API key via OpenRouter, manage environment variables, set up billing and keep your key safe. A 10-minute setup guide.
Updated 2026-10-02
Jev vs LLM-as-a-Judge: Which Should You Use for Evaluation?
A practical comparison of jev ai vs LLM-as-a-Judge for automated evaluation pipelines: parsing pain, positional bias, per-grade cost arithmetic, and when a dedicated judgment model delivers more reliable scores at lower cost.
Updated 2026-10-06
Jev LLM Guardrails: Screen Every Input and Output in One Request
Build LLM guardrails with Jev: four hazard Noul questions plus a severity Score screened in a single request, then thresholded in your own code into pass, review, block or a support path. Covers input and output screening, two named policies and adapting the battery to your traffic.
Updated 2026-10-07
What Is Jev AI? A Working Guide to the Judgment Model API
What is Jev AI? A plain-English explainer of the Jev judgment model by TypeSafe AI — its three primitives, request shape, confidence field, cost profile, and when not to use it.
Updated 2026-10-07
Jev Language Support: English First, CJK Usable — How to Verify It on Your Own Content
Jev accepts natural-language text, but the official documentation is explicit that English is the primary training language and that other languages, CJK scripts included, are handled but not equally well. This guide turns that warning into a procedure: sample your own traffic per language, measure agreement and confidence separately, set per-language thresholds, and choose a fallback ladder before you ship.
Updated 2026-10-08
Jev Router: When Routing Beats Pinning Jev 1.13
Jev Router (typesafe/jev-router) picks a model and reasoning effort per request using Jev. Cost tiers, model preference lists, router metadata, error codes, and when to pin jev-1.13 instead.
Updated 2026-11-03
Jev API SDK Guide: Python and JavaScript Clients (typesafe-sdk)
Install and use the official TypeSafe SDKs to call the Jev API: typesafe-sdk and @typesafe-ai/sdk, client options, typed answers, RetryPolicy, zstd compression, logging redaction, model aliases and error codes.
Updated 2026-11-05
Jev API Access Routes: Official Endpoint, OpenCode Zen and OpenRouter
Three routes to the Jev API in November 2026: the official api.typesafe.ai endpoint, OpenCode Zen's jev-1.13 plus its free variant, and OpenRouter. Live endpoint probes, cost arithmetic per 1,000 requests, the no-credits key error, and a channel verification checklist.
Updated 2026-11-07