LightOn Engineer Antoine Chaffin Joins Perplexity AI
On August 20, engineer Antoine Chaffin announced he was leaving French AI startup LightOn to join Perplexity AI, calling it a difficult decision while expressing pride in what the LightOn team built; his goal remains solving search on the open web. Perplexity's Bo Wang responded that the company is assembling the strongest retrieval team and will work alongside Antoine. Multiple independent authors relayed the news the same day.
Confirmed
- Antoine Chaffin personally announced leaving LightOn for Perplexity AI (m3, m1)
- He said the departure was difficult but he is proud of LightOn's work (m2, m4)
- His goal is unchanged: solving search on the open web (m3, m4)
- Perplexity's Bo Wang said the company is building the strongest retrieval team and will work with Antoine (m7)
- Commenters called him one of the best minds in the field, a ColBERT contributor, and expected his arrival to accelerate Perplexity's product release cadence (m8, m6)
- @tomaarsen described him as a Hugging Face developer community member; others called him a LightOn founding member (m9, m8)
Why it matters
- Perplexity continues recruiting search/information-retrieval talent from the European AI scene, and Bo Wang's remarks suggest a systematic push to strengthen its retrieval team
- Multiple independent same-day reports lend the news high credibility
2026-08-20 ~ 2026-08-21 · 9 related posts
Primary sources
- Engineer moves from LightOn to Perplexity to solve search — antoine_chaffin ·
- Retrieval Engineer Antoine Chaffin Joins Perplexity AI — antoine_chaffin ·
- Hugging Face dev Antoine Chaffin joins Perplexity AI — tomaarsen ·
- [source] Engineer moves from LightOn to Perplexity to solve search — antoine_chaffin · 2026-08-20
- [source] Hugging Face dev Antoine Chaffin joins Perplexity AI — tomaarsen · 2026-08-20
- Perplexity Hires Engineer from LightOn to Boost Search — doesdatmaksense · 2026-08-20
- Ex-LightOn engineer joins Perplexity AI — ivanleomk · 2026-08-20
- LightOn co-founder Antoine Chaffin joins Perplexity — antoine_chaffin · 2026-08-20
- ColBERT contributor Antoine Chaffin leaves LightOn to join Perplexity — lateinteraction · 2026-08-21
3 near-duplicate retellings: eliebakouch · antoine_chaffin · capetorch