Anthropic developer guide: using Jev as a checker for Opus 5.5
A nine-tip manual covers using Jev for routing, complexity scoring, cascade reruns and confidence thresholds so Opus isn't called for every small decision.
A developer from Anthropic posted a guide on how to use JEV + Opus 5.5 GUIDE TELLS YOU TO ADD A SMALLER MODEL AS A CHECKER. JEV IS THAT MODEL. HERE'S THE 9-TIP MANUAL FOR RUNNING THEM TOGETHER. And most people are still paying Opus to answer questions a $0.042 model answers in milliseconds. The mistake everyone is making? Using Opus 5.5 for every decision. "Which tool?" "Is this safe?" "Is it done?" Every one of those is a full Opus call. Opus 5.5 → $4 per 1M input tokens Jev → $0.042 per 1M input tokens. Output is free. → routing - Jev reads the intent, Opus only runs where it's needed → effort - let Jev's complexity score pick low, medium or high → cascade - run Opus at low, Jev checks every field, rerun at high only if a flag fires → confidence - below 0.5 hand off to a human, above 0.85 act on its own → "is it done?" - Jev checks the checklist so unattended Opus stops quitting early → guardrails - screen the input and the output in one call → atomic questions - Jev can't count or compare dates. your code can Three things that will surprise you: → Jev's input is ~95x cheaper than Opus 5.5's → Anthropic's guide already describes exactly where Jev fits → one fake line in the input dropped Jev's block probability from 0.76 to 0.48, so keep tool output out of it Before → Opus decides everything After → Jev decides → Opus does the work → Code checks → Done Opus 5.5 is the worker. Jev is the switchboard. Stop paying the worker to answer the phone.
This post quotes another post: x.com/solst1ne/status/2101724066369654935