Study Explores Filler Tokens and Hidden LLM Reasoning

An arXiv paper sparked debate by suggesting frontier LLMs use semantically irrelevant filler tokens for hidden reasoning. However, critics argue that improved accuracy from filler tokens does not conclusively prove implicit reasoning.

2026-07-28 ~ 2026-07-29 · 2 related posts

• Study finds frontier LLMs can reason through filler tokens invisible to CoT — dair_ai · 2026-07-28
• Filler tokens may boost LLM accuracy without proving invisible reasoning — askerlee · 2026-07-29