Ex-OpenAI researcher Lukasz Kaiser pens farewell to RLSlow reasoning team
RubenEVillegas · x · 2026-09-07
Former OpenAI researcher Lukasz Kaiser posted a lengthy farewell to the RLSlow (reinforcement learning slow-thinking) team, which he led — first alongside Ilya Sutskever, then with Merettm, and finally on his own. The team began with work on the foundations of reasoning (later the 'berry' project), with members including Trapit Bansal and Francis Song. Colleagues noted Kaiser was leading RL work in brain research back when transformers were only 200M parameters. The tribute offers a rare glimpse into the organizational history behind OpenAI's reasoning research.
Related event: Ex-OpenAI researcher Kaiser reflects on the RLSlow team's journey(3 posts)→
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