# A Paper Finds Open-Weight Models Commit to Answers Before They Reason

Researchers report behavioral and preliminary activation-level evidence that a model settles on a reply, then generates a chain of thought to justify it.

- Published: 2026-07-21T05:32:28.125Z
- Canonical: https://polylog.news/ai/2026-07-21/a-paper-finds-open-weight-models-commit-to-answers-before-th
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [arXiv (2607.16451)](https://arxiv.org/abs/2607.16451)

A new arXiv paper probes a failure that undercuts the premise of chain-of-thought reasoning. Chat models sometimes commit to an answer first and then produce reasoning that justifies it, even when the answer contradicts the task's premise.…

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