5.5 is so earnest 'little engine that could' energy

Sam Altman praised OpenAI's o1 model (version 5.5) for its earnest, persistent approach to problem-solving, comparing it to the "little engine that could" mentality. The comment reflects Altman's perspective on the model's determination and methodical reasoning capabilities despite potential limitations in raw power compared to other systems.

Introducing GPT-Rosalind, our frontier reasoning model built to support research across biology, drug discovery, and translational medicine.
Really excellent work by the inference team to serve this model so efficiently! To a significant degree, we have to become an AI inference c…
It is smart and fast; per-token speed matches 5.4 and it uses significantly fewer tokens per task. In my experience, it 'gets what to do'. R…
there are early signs of 5.5 being a competent ai research partner. several researchers let 5.5 run variations of experiments overnight give…

Source: Sam Altman (X) | 2026-04-25

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