holy sh*t, this is the agent setup nobody is talking about yet
opus 5.5 + sonnet 5.5 + jev, wired into one loop
most multi-model stacks do one of two things:
dump everything into one giant context, or hardcode a loop that dies after 5 steps
you re-pay for the same history every turn, and your most expensive model ends up babysitting tiny decisions
this setup splits the work into layers:
> opus 5.5 - control. writes the plan, never the patch
> sonnet 5.5 - 3 builders, one branch each, fresh context, sandboxed
> jev - decision layer. which branch, which tier, retry or stop, does this touch prod. typed answer in 70–500 ms, ~$0.00003 a call
> verifier - isolated. sees the diff and hidden tests, never the builder's reasoning
> memory - context resets every lap, history lives in a graph, an offline pass turns wins into rules
opus sets the direction. sonnet tests it in code. jev makes every small call in between and never writes a token
the shift: your frontier model stops being your router
This is f*cking insane. I spent thousands of dollars before I split my work across three models
put Opus 5.5 on the plan, Sonnet 5.5 on the legwork and Fable 5.1 on call, and you stop spending Opus money on jobs it was never needed for
who does what:
Opus 5.5, high effort: makes the plan and owns the final diff
Sonnet 5.5, medium effort, three jobs: explorer reads the code, worker edits files and runs tests, researcher pulls the docs
Fable 5.1, through /advisor fable: reads the whole session, but only when it gets called
Fable is consulted at three points:
→ before a plan ships: is this the right approach?
→ when an error comes back twice: is the search stuck in the wrong place?
→ before a long task counts as done: what got missed?
Jev engineering applies the same split to the smallest decisions. which file to open, which tool to run, retry or stop need no reasoning, so Jev answers them in under half a second and the big models only get the real forks
run Opus on everything and you pay it to check whether a file exists
paste this into Claude Code:
"Rebuild my Claude Code setup around three tiers.
Look in ~/.claude/agents and .claude/agents for subagents that already cover explorer, worker and researcher. Create only the missing ones, each with model: sonnet and effort: medium. If an existing one is pinned to another model, list it and leave it alone.
In ~/.claude/settings.json, set advisorModel to fable. Set high effort for Opus inside modelSettings for claude-opus-5-5, because a top-level effortLevel does not apply to Opus 5.5.
Report, without changing anything: CLAUDE_CODE_DISABLE_ADVISOR_TOOL, DISABLE_TELEMETRY or anything blocking feature-flag fetches, CLAUDE_CODE_EFFORT_LEVEL, which can override subagent effort, and whether Fable as advisor needs a one-time billing consent. If you can't tell, say so.
Add one line to ~/.claude/CLAUDE.md: consult the advisor before a big plan, when the same error shows up twice, and before marking a long task done.
Show every change as a diff first. Touch nothing until I say go."
https://t.co/9PkPvMMCVO
📁 Derya Unutmaz, immunologists and top experts on T cells, is internationally recognized for his pioneering work on immunity, aging, and chronic disease. This is what he says about AI:
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US issues travel warning to its citizens travelling to India that it’s not safe, while this is happening on a daily basis in America.
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