# Open Source LLM Statistics (2026)

> As of September 30, 2026, 11 of the top 50 AI models on BenchLM (22%) are open-weight. Updated September 30, 2026; every number regenerates from BenchLM's live dataset on each data refresh.

## Key statistics

- As of September 30, 2026, 11 of the top 50 AI models on BenchLM (22%) are open-weight.
- As of September 30, 2026, the highest-ranked open-weight model on BenchLM is Xiaomi's MiMo-V2.6-Pro at 74.18/100 and #9 overall.
- As of September 30, 2026, 94 open-weight models receive a current overall score in BenchLM's ranked cohort.
- The gap between the top proprietary model (GPT-6 Astra) and the top open-weight model (MiMo-V2.6-Pro) is 14.04 points on BenchLM's 100-point overall score as of September 30, 2026.
- 52% of the 523 AI models tracked by BenchLM (271 models) are open-weight as of September 30, 2026.
- The Arena Elo gap between the top closed and top open model narrowed to 18.4 points by 2026-09-01, from 32.4 points roughly a year earlier, per Arena data tracked on BenchLM.

## Methodology

"Open-weight" follows the sourceType field in BenchLM's catalog. Rankings use the active BenchAlign overall score, rebuilt from current inputs on every build. Each position is labeled Supported or Estimated within one shared ordering. Arena Elo figures come from the Arena leaderboard snapshot tracked on BenchLM.

## FAQ

### How close are open-source models to closed models?

As of September 30, 2026, the top open-weight model (MiMo-V2.6-Pro) ranks #9 overall on BenchLM, 14.04 points behind the top proprietary model (GPT-6 Astra) on a 100-point scale.

### What share of top AI models are open-weight?

22% of BenchLM's overall top 50 (11 models) are open-weight as of September 30, 2026.

### What is the best open-source LLM by benchmark score?

As of September 30, 2026, Xiaomi's MiMo-V2.6-Pro is the highest-ranked open-weight model on BenchLM at 74.18/100 and #9 overall. “Open-weight” describes downloadable weights; the page separates OSI-approved licenses from community and custom terms.

## Sources

- [Open-source model rankings](https://benchlm.ai/best/open-source)
- [Arena Elo over time](https://benchlm.ai/llm-leaderboard-history)
- [Self-hosting cost calculator](https://benchlm.ai/tools/self-host-calculator)

Cite as: BenchLM.ai, "LLM Statistics" (September 30, 2026), https://benchlm.ai/stats/open-source-llm

Canonical page: https://benchlm.ai/stats/open-source-llm