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Jan Leike @ Anthropic

Verdictpartial85%
4 checks · 5/11/2026
Headline partial — 3 high-relevance sources partial, 1 high-relevance source unverifiable.

3 → partial; dissent: 1 → unverifiable

Our claim

entire record
Person
Jan Leike
Role
Co-lead, Alignment Science Team
Role Type
career
Start Date
May 2024
Is Founder
No
Notes
Joined Anthropic same month he left OpenAI

Source evidence

4 src · 4 checks
unverifiable95%Haiku 4.5 · 5/11/2026

NoteRe-check. Previous verdict: partial. Verdict changed.

partial85%Haiku 4.5 · 4/9/2026

NoteThe source confirms Jan Leike works at Anthropic and is associated with alignment science work. However, the source describes him as 'co-lead of the Alignment Science team' rather than 'Head of Alignment Science'. These are different titles—'co-lead' implies shared leadership with others, while 'Head' suggests sole leadership. The source also confirms he joined in 2024 (matching the 2024-05 start date claim), but does not specify May 2024. The core facts are confirmed but the specific job title differs.

partial85%Haiku 4.5 · 5/1/2026

NoteThe source confirms Jan Leike works at Anthropic and leads the Alignment Science team. However, the source says he 'leads' the team, not 'co-leads' it. The record claims 'Co-lead' but the source text states 'I lead the Alignment Science team' (singular leadership language). Additionally, the source provides no start date information, so the claimed startDate of 2024-05 is unverifiable from this source. The role title is partially confirmed but with a discrepancy in the leadership designation (lead vs. co-lead).

partial85%Haiku 4.5 · 4/10/2026

NoteThe source confirms Jan Leike joined Anthropic in May 2024 (matching the startDate of 2024-05) and confirms he leads a team focused on alignment work. However, the source describes his role as leading a 'superalignment' team working on specific technical areas (scalable oversight, weak-to-strong generalization, automated alignment research), not explicitly as 'Head of Alignment Science.' The role title in the record is not directly stated in the source text, making it unverifiable whether 'Head of Alignment Science' is the official title used by Anthropic, though the substance of the role (leading alignment work) is confirmed.

Case № E4EpfKnthSFiled 5/11/2026Confidence 85%