OpenAI MRCR v2 8-needle 512K-1M (MRCR v2 512K-1M)
We show this table for reference; we do not rank on it.
MRCR v2 slice focused on retrieval across 512K-1M-token contexts.
Benchmark score on MRCR v2 512K-1M — October 17, 2026
We compile the MRCR v2 512K-1M rows from provider self-reports. Muse Spark 1.3 leads the table at 98.1%, followed by GPT-6 Astra (96.3%). We do not use these results to rank models overall.
2 modelsReasoningCurrentDisplay onlyUpdated October 17, 2026
Benchmark score table (2 models)
| Rank | Model / configuration | Score | Parameters (B) | Open / closed |
|---|---|---|---|---|
| 1 | Muse Spark 1.3Meta | 98.1% | Not reported | Closed |
| 2 | GPT-6 AstraOpenAI | 96.3% | Not reported | Closed |
About MRCR v2 512K-1M
Year
2026
Tasks
100 eight-needle retrieval examples
Format
Mean sequence-matcher ratio
Difficulty
Million-token retrieval
Meta re-bins OpenAI's MRCR v2 data by o200k_base token count and evaluates 100 examples with eight needles. The mean sequence-matcher ratio stays display-only because this slice is not part of the weighted reasoning schema.
Freshness and provenance
Version
MRCR v2 512K-1M 2026
Refresh cadence
Quarterly
Staleness state
Current
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 MRCR v2 512K-1M measure?
MRCR v2 slice focused on retrieval across 512K-1M-token contexts.
Which model scores highest on MRCR v2 512K-1M?
Muse Spark 1.3 by Meta currently leads with a score of 98.1% on MRCR v2 512K-1M.
How many models are evaluated on MRCR v2 512K-1M?
2 AI models have published results on MRCR v2 512K-1M in the BenchLM catalog.
Compare top models on MRCR v2 512K-1M
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
Read a sample issueJoin 5,600+ readers.
One email each week. Unsubscribe anytime.