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Fable 5.1 reportedly spawned 126 subagents and burned 8.4M tokens on a five-file i18n audit
An r/ClaudeAI user reports Fable 5.1 fanning out to 126 agents for a five-file internationalisation audit, consuming roughly 8.4 million tokens, in a thread with 48 comments. It sits alongside several same-day threads on faster-than-expected quota burn, including a Max 20 subscriber who exhausted usage and reverted to Opus 5. Single-user anecdote rather than measured benchmark, but the direction agrees with the MineBench 2.7x cost result, so anyone running 5.1 in an orchestrator loop should cap subagent fan-out explicitly.
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