As of July 8, 2026, Anthropic moved Fable 5 off Pro/Max/Team subscriptions and onto usage-credit billing. The Mythos-tier model a lot of us leaned on is now a pay-per-use add-on.
Before you top up credits, a reframe: on the long, autonomous runs where Fable 5 felt irreplaceable, the bottleneck usually isn't raw model IQ. It's that Opus drifts off-mission and loses the goal to auto-compaction. Fix those two things and Opus punches far above where it feels on a multi-day task.
That's what I built ploop for.
ploop (Overclock Loop) is an autonomous loop for Claude Code, built for missions that span hours or days. You hand it a mission once; it keeps Opus on-target and self-checking until the work is actually done.
An isolated advisor, every round. After each round of work, a separate advisor subagent reviews what the main agent did and surfaces the blind spots it missed — the uncovered angles, the skipped edge cases. That advice is injected into the next round. Because the advisor runs in its own context, it isn't carried along by the main agent's momentum, so it catches drift instead of rationalizing it.
The mission survives compaction. On long runs, auto-compaction quietly drops the original goal and the agent starts confidently doing the wrong thing. ploop preserves the mission outside the transcript and re-injects it on every compaction, so the goal never decays.
Subscription-safe by design. The naive way to drive a loop like this is spawning claude -p
from a hook — the exact automation pattern that risks Pro/Max account bans. ploop instead runs on nested subagents (the official Agent tool), so it shares your normal session quota and stays inside your subscription. No credits, no ban risk.
No round cap. The loop ends when the advisor has nothing left to add — a semantic finish, not an arbitrary counter. You can stop it anytime with /ploop:stop
.
Requires uv, and Auto-Compact must be on. Recommended model: opus[1m]
.
claude plugin marketplace add clomia/claude-automata
claude plugin install ploop@claude-automata
Then:
/ploop:define-mission # write your mission
/ploop:launch [your mission] # in a fresh session
It's open-source (MIT): https://github.com/clomia/claude-automata
If you're staring at the Fable 5 credit prompt right now, point ploop at a real multi-day task on Opus first and see how far it gets. Feedback welcome.