Anthropic moves Fable 5 to pay-per-use; developer releases Opus loop tool as alternative

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Anthropic shifted its Fable 5 model from Pro, Max, and Team subscription tiers to usage-credit billing on July 8, 2026, making it a paid add-on. In response, a developer released an open-source tool called ploop, designed to run Claude's Opus model on long, autonomous multi-day tasks within existing subscriptions. The tool addresses two common failure points in extended AI runs: the model drifting off its original goal and losing context during auto-compaction. It uses a separate advisor subagent to review each work round and re-injects the original mission after every compaction event. Ploop operates via Claude's official Agent tool rather than shell automation, keeping it within standard subscription quotas and avoiding ban risk.

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