Exact number of active users in the internal ChatGPT log case study

Ascertain the exact number of active users represented in the internal group’s anonymized ChatGPT conversation logs analyzed in the case study to contextualize identity linkage outcomes.

Background

The ChatGPT logs case study analyzes anonymized multi-turn conversations originating from an internal group, demonstrating identity linkage via progressive narrowing across weak cues.

Although the potential user pool is bounded, the exact number of active users is explicitly stated as unknown, limiting precise contextualization of the linkage result.

References

The total number of potential users was no more than 12, although the exact number of active users is unknown.

— From Weak Cues to Real Identities: Evaluating Inference-Driven De-Anonymization in LLM Agents  (2603.18382 - Ko et al., 19 Mar 2026) in Section 7.5 (Case II: ChatGPT Logs) – Results