Neo Open SLM Leaderboard sub-150m

Independent evaluations on LM-Eval Harness & ArithMark-3.0.

Size
Arch

Loading benchmark data...

Cmp # โ–ผ Model Params Int Index HellaSwag ARC-E ARC-C PIQA ArithMark-3 Avg Fit Std Dev ArithMark-2 Released
Active Metric:

Parameters vs. Accuracy

Dashed line: Linear regression fit. Shaded zone: Outperforming parameter expectation.

Top 12 Performers

Top models for the selected benchmark.

# Organization Models Tracked Mean Fit Std Dev Mean Score Top Model
23/08/2026 update
Architecture Transparency Update

You can now filter models by architecture type. Standard models work out of the box with GGUF, vLLM, and standard runtimes with zero remote code execution.

12/07/2026 change
Leaderboard Math Changes

ArithMark-3 is now the primary math benchmark for ranking, weighting subject to change. ArithMark-2 remains available in the expanded columns.

19/06/2026 new
Axiomic Labs GPT-S2 takes <10M #1 spot

Built on Axiomic Labs' T-X4 refresh-gated XSA stack, GPT-S2-5M pushes into the sub-10M bracket and lands at the top, dethroning SLM-10M.

Chance-Normalized Intelligence Index Calculation

Standard raw accuracy averages reward models for trivial chance performance on multiple-choice benchmarks. The Intelligence Index normalizes each benchmark against its theoretical random baseline, ensuring that chance performance equals 0 and perfect performance equals 100.

N(score, chance) = 100 × (score − chance) ÷ (100 − chance)
Int Index = (HellaSwag + Combined_ARC + PIQA + 0.65 × ArithMark-3) ÷ 3.65
HellaSwag
Weight: 1.00 · Chance: 25.0%
Combined ARC
Weight: 1.00 · Chance: 25.0%
PIQA
Weight: 1.00 · Chance: 50.0%
ArithMark-3
Weight: 0.65 · Chance: 25.0%

* Combined ARC is defined as (ARC-Easy + ARC-Challenge) / 2 prior to normalization. If a benchmark component is missing from a model checkpoint, its corresponding weight is deducted from both numerator and denominator. Minimum 2 evaluated tasks required for inclusion.

Add your model

Open a Discussion or a PR on this Space (whichever you're more comfortable with) with your model's benchmark results. Always report normalized accuracy (acc_norm) when available across evaluation frameworks. Submissions are independently verified by our team before merging. To qualify, your model must be pretrained by you and have open weights. Open a Discussion / PR →

Listing Policy & Benchmark Integrity

AtomixLabs evaluates and indexes public open-weight models independently and via community submissions. To preserve benchmark integrity and prevent selective reporting, publicly released models cannot opt out. While creators of active work-in-progress checkpoints may request an exemption, AtomixLabs retains final authority over whether any model or preview is indexed.

Integrity & Neutrality: Any model with confirmed test-set leakage, data contamination, or artificial overfitting will be flagged or removed. Rankings are strictly merit-based: all models stand solely on their verified scores, free from creator disputes or personal politics.