LongMemEval
We show this table for reference; we do not rank on it.
Tests whether a chat assistant recalls and reasons over information spread across long, multi-session conversation histories.
Benchmark score on LongMemEval — October 29, 2026
We compile the LongMemEval rows from provider self-reports. The table contains 2 models. Nemotron 3.5 Bolt E4B BF16 has the highest published score at 72.10%, but the available coverage and evaluation setups do not establish a market leader. We do not use these results to rank models overall.
Nemotron 3.5 Bolt E4B BF16
NVIDIA
Nemotron 3.5 Bolt E4B
NVIDIA
2 modelsReasoningRefreshingDisplay onlyUpdated October 29, 2026
Benchmark score table (2 models)
| Rank | Model / configuration | Score | Parameters (B) | Open / closed |
|---|---|---|---|---|
| 1 | Nemotron 3.5 Bolt E4B BF16NVIDIA | 72.10% | Not reported | Open |
| 2 | Nemotron 3.5 Bolt E4BNVIDIA | 69.92% | Not reported | Open |
How to read this leaderboard
Operator receipt: 2 sourced rows are currently displayable on this page; the highest published score among these 2 models is Nemotron 3.5 Bolt E4B BF16 at 72.10%, which does not establish a market leader.
Honest limit: Only NVIDIA-run results are stored so far, from one harness. Display-only and excluded from weighted ranking.
About LongMemEval
Year
2024
Tasks
Questions over multi-session chat histories
Format
Overall accuracy
Difficulty
Recall across conversations
NVIDIA reports it for Nemotron 3.5 Bolt E4B (October 23, 2026), run in its NeMo Gym harness, as overall accuracy in reasoning mode.
Freshness and provenance
Version
LongMemEval 2024
Refresh cadence
Annual
Staleness state
Refreshing
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does LongMemEval measure?
Tests whether a chat assistant recalls and reasons over information spread across long, multi-session conversation histories.
Which model scores highest on LongMemEval?
Nemotron 3.5 Bolt E4B BF16 by NVIDIA currently leads with a score of 72.10% on LongMemEval.
How many models are evaluated on LongMemEval?
2 AI models have published results on LongMemEval in the BenchLM catalog.
Compare top models on LongMemEval
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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