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Irwan Bello

Researcher · Founder

Machine learning

Now Starting a new company at the intersection of AI, research, compute and science · Unnamed new company

@IrwanBelloirwanbello.github.io ↗

AI researcher and seed investor in San Francisco, starting a new company in 2026 on AI, research, compute and science. Earlier: post-training lead on Reflection AI's founding team, early ChatGPT and GPT-4 at OpenAI, and Google Brain from 2016 to 2022.

Path

Current

  1. Unnamed new companyStarting a new company at the intersection of AI, research, compute and science
    2026 – present

Previous

  1. Reflection AIFounding team, post-training lead
    2024 – 2026
  2. OpenAIEarly ChatGPT team (post-training, inference, GPT-4)
    2023 – 2024
  3. Character.aiFounding team
    2022 – 2023
  4. Google BrainResearch Scientist
    2016 – 2022

Sourcesirwanbello.github.iox.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/IrwanBello · Avatar from their X account, taken 2026-11-02

Nothing else on the record names them yet.

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