Implicit Thinking Budget Constraints in Multi-Task LLMs
October 18, 2026
Research shows that LLMs, including Claude Opus 5, exhibit a performance drop when solving composed tasks due to an implicit thinking budget. Models use significantly fewer tokens per constituent task when they are prompted together compared to when they are solved in isolation.
HOW THIS AFFECTS YOU
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builderYou should avoid grouping too many distinct tasks in a single prompt to prevent reasoning degradation.
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researcherThis suggests that current scaling laws might not account for task composition complexity.