# Long-Context Memory Retrieval and Reasoning on LongMemEval 50K context input token limit Source: [Long-Context Memory Retrieval and Reasoning on LongMemEval 50K context input token limit]() Collection index: [llms.txt]() Data updated: 2026-06-11T10:26:30.330Z Evaluation of model performance on the LongMemEval dataset configured with a 50,000 token context limit, assessing long-context memory retrieval and reasoning using specific L-J score metrics. A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. | Scope | Recorded value | | --- | --- | | Task | Long-Context Memory Retrieval and Reasoning | | Dataset (including any stated split) | LongMemEval 50K context input token limit | | Metric | KU L-J Score | | Unit | SCALAR | | Direction | Higher is better | | Results loaded | 10 of 10 | | Coverage | All results currently returned for this benchmark | Evaluation settings may differ between results. The original papers and recorded configurations are needed to establish comparability. A shared metric name alone does not establish an identical protocol. ## Metrics - [KU L-J Score](): Higher is better; unit: SCALAR. - [SS-assist L-J Score](): Higher is better; unit: SCALAR. - [SS-prefer L-J Score](): Higher is better; unit: SCALAR. - [SS-user L-J Score](): Higher is better; unit: SCALAR. - [Temporal L-J Score](): Higher is better; unit: SCALAR. - [Overall L-J Score](): Higher is better; unit: SCALAR. ## Recorded results | Method | KU L-J Score | Result date | Report paper | | --- | --- | --- | --- | | HORMA | 89.7 | Not recorded | 6a2a4136d33dfb23e783943b | | Acon | 64.1 | Not recorded | 6a2a4136d33dfb23e783943b | | A-MEM | 64.1 | Not recorded | 6a2a4136d33dfb23e783943b | | Truncation | 62.8 | Not recorded | 6a2a4136d33dfb23e783943b | | ReSum | 60.3 | Not recorded | 6a2a4136d33dfb23e783943b | | Embedding Retrieval | 44.9 | Not recorded | 6a2a4136d33dfb23e783943b | | Mem0 | 42.3 | Not recorded | 6a2a4136d33dfb23e783943b | | No limit | 37.2 | Not recorded | 6a2a4136d33dfb23e783943b | | Embedding | 37.2 | Not recorded | 6a2a4136d33dfb23e783943b | | Slide Window | 19.2 | Not recorded | 6a2a4136d33dfb23e783943b | ### HORMA KU L-J Score: 89.7. Result ID: 6a2a8bedfbc373592c28575c. [Reporting paper]() [Method origin paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"External Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### Acon KU L-J Score: 64.1. Result ID: 6a2a8bedfbc373592c285758. [Reporting paper]() [Method origin paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"Internal Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### A-MEM KU L-J Score: 64.1. Result ID: 6a2a8bedfbc373592c285759. [Reporting paper]() [Method origin paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"External Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### Truncation KU L-J Score: 62.8. Result ID: 6a2a8bedfbc373592c285754. [Reporting paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"Internal Static Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### ReSum KU L-J Score: 60.3. Result ID: 6a2a8bedfbc373592c285757. [Reporting paper]() [Method origin paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"Internal Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### Embedding Retrieval KU L-J Score: 44.9. Result ID: 6a2a8bedfbc373592c28575b. [Reporting paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"External Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### Mem0 KU L-J Score: 42.3. Result ID: 6a2a8bedfbc373592c28575a. [Reporting paper]() [Method origin paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"External Dynamic Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### No limit KU L-J Score: 37.2. Result ID: 6a2a8bedfbc373592c285753. [Reporting paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Context Token Limit":"No limit"}. This record does not assert independent reproduction. ### Embedding KU L-J Score: 37.2. Result ID: 6a2a8bedfbc373592c285756. [Reporting paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"Internal Static Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. ### Slide Window KU L-J Score: 19.2. Result ID: 6a2a8bedfbc373592c285755. [Reporting paper]() Recorded evaluation configuration: {"Primary Agent Backbone":"Claude Sonnet 4.5","Memory Architecture Category":"Internal Static Memory","Context Token Limit":"50K"}. This record does not assert independent reproduction. Page 1 of 1. This is an index page, not the full collection.