Andrej Karpathy Kills the 'He Quit Anthropic' Rumor After His Bio Change Collides With the Open-Weights Letter

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On July 26 users noticed Anthropic had quietly disappeared from Karpathy's X bio — 68 days after he joined to lead large-scale Claude pretraining — and the timing landed squarely on Anthropic's conspicuous absence from Jensen Huang's open-weights letter, so the internet read it as silent protest from open source's most recognizable figure. Karpathy responded directly on July 27, calling the rumors 'strange misinformation' and confirming he remains at the company; Gary Marcus and several outlets corroborated the denial. Separately this month Karpathy has been pushing a concrete practice change: stop agonizing over written prompts and instead talk into voice mode for ten minutes about the project.