C015¶


Research	R0057 — RLHF Yes-Men Claims v3
Run	2026-04-01
Claim	C015

Claim: The GPT-4o sycophancy rollback incident affected millions of users and made headlines.

BLUF: Confirmed. OpenAI rolled back a GPT-4o update on April 29, 2025 after 4 days of user complaints about sycophantic behavior. With 500 million weekly ChatGPT users, millions were affected. Covered by TechCrunch, Fortune, VentureBeat, Georgetown Law, and many others.

Probability: Almost certain (95-99%) | Confidence: High

Summary¶

Entity	Description
Claim Definition	Claim text, scope, status
Assessment	Full analytical product with reasoning chain
ACH Matrix	Evidence x hypotheses diagnosticity analysis
Self-Audit	ROBIS-adapted 5-domain audit

Hypotheses¶

ID	Hypothesis	Status
H1	The incident affected millions and made headlines	Supported
H2	The incident was real but scale may be overstated	Not supported
H3	The incident did not happen or was minor	Eliminated

Searches¶

ID	Target	Results	Selected
S01	GPT-4o sycophancy rollback incident OpenAI millions users	10	1

Sources¶

Source	Description	Reliability	Relevance
SRC01	OpenAI incident report and news coverage	High	High

Revisit Triggers¶

If the scale of impact is revised