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Karina Nguyen

Researcher · Founder

Machine learning

Now Building Thoughtful · Thoughtful

@karinanguyenkarinanguyen.com ↗

AI researcher who worked on post-training at Anthropic for Claude 1 to 3 and at OpenAI on the o-series models, GPT-4o, Canvas and Tasks. Co-author of SimpleQA. Now building Thoughtful, which funded and led PostTrainBench.

Path

Current

  1. ThoughtfulBuilding Thoughtful

Previous

  1. AnthropicPost-training and model behavior research for Claude 1 to 3; early claude.ai and Claude in Slack
    2022 –
  2. OpenAIAI researcher (post-training, practical alignment, reinforcement learning, product)
  3. Primer.ai, Dropbox, Square, The New York Times, Fireflies.aiSoftware engineering and product design internships

Sourceskarinanguyen.comthoughtfullab.comEducation and jobs are read from their own homepage or employer's page; papers checked on arXiv. From LinkedIn only the person's own public posts are read; GitHub is a link only.

Account links back to x.com/karinanguyen · Avatar from their X account, taken 2026-11-02

Nothing else on the record names them yet.

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