The back of the Navier-Stokes milestone shirt is the last line of the chain-of-thought from the solution:
OpenAI model's Navier-Stokes proof chain-of-thought printed on milestone shirt
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Sam Altman posts a photo of a Navier-Stokes milestone shirt whose back shows the last line of the chain-of-thought from the solution. The post does not identify the model or the mathematical result beyond the Navier-Stokes reference.
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Source: Sam Altman · x.comPublished · added here