ResearchResearch paperLarge Language Models1 source · Oct 19, 2026

Truncated Reasoning Under a Budget: Evaluating System-1 Models as Decision-makers

We evaluate Jev as a decision reader of truncated reasoning across seven LLM reasoners and five multiple-choice benchmarks (35 pairs).

Key points

  • Large language models (LLMs) often generate more reasoning tokens than needed.
  • Limiting the reasoning budget reduces cost, but forcing an answer from an incomplete trace can hurt accuracy.
  • System-1 decision models select among candidate options without producing a reasoning response.
  • These findings suggest that System-1 decision models can complement LLM reasoning and reduce the need for costly reasoning completion.

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