Opus 5 (high) hallucination

A developer using Opus 5 (High) for API service catalog automation encountered a hallucination when the model suggested merging three pull requests (PRs) instead of the planned one, plus one in flight. Upon questioning the third PR, Opus 5 provided an unhelpful response. The developer noted they are using Claude Code in VSCode.

This report highlights a specific hallucination instance in Opus 5 (High), unlike general reports on model inaccuracies, by detailing its suggestion of three PRs instead of two.