ChatGPT, Claude and Gemini all ship memory features now, and the pitch is the same: an assistant that knows you. Your preferences, your projects, your goals, carried across conversations.

OpenAI's own memory FAQ admits the awkward part. It says the previous saved-memories system "often became stale" and could hold contradicting memories at the same time. That is exactly the version of the problem a new benchmark called Memora is built to measure.

The paper behind it, "From Recall to Forgetting" (Uddin et al., Arizona State, University of Arizona, Genies, Findings of ACL 2026), argues that the way we test agent memory has a blind spot: we test recall, while in the authors' framing, real long-term memory is mostly revision.

The blind spot in how memory gets tested

Look at how existing long-term memory benchmarks are built:

In LoCoMo, 94% of evaluation questions can be answered with evidence from at most two past sessions. In LongMemEval it is 85%.…