TinyBrainBot-100M-v3-Base

A 100M-parameter (75.5M non-embedding) from-scratch base language model, trained on 25B tokens. Same size and class as SupraLabs/Supra2-100M, and it beats Supra2-100M-Base on 6/7 benchmarks on the official EleutherAI LM-Eval Harness — at a smaller token budget (25B vs 30B).

  • Architecture: Llama-compatible — hidden 768, 12 layers, 12 heads / 4 KV, FFN 2048, context 1024, vocab 32,000, tied embeddings.
  • Training: 25B-token WSD pretrain (fineweb-edu / dclm / wikipedia / gutenberg / cosmopedia + a quality anneal), then a short knowledge-focused continuation.

Benchmarks (EleutherAI lm-eval, 0-shot, acc_norm; WinoGrande/MMLU = acc)

Benchmark This model Supra2-100M-Base Supra2-100M-Instruct
ARC-Easy 54.7 47.8 44.4
ARC-Easy (raw acc) 58.6 54.3 51.4
ARC-Challenge 30.1 24.8 24.7
ARC-Challenge (raw acc) 26.6 22.4 22.7
OpenBookQA 34.0 32.0 30.4
OpenBookQA (raw acc) 22.6 19.0 17.2
WinoGrande 53.0 50.7 50.5
PIQA 66.2 65.5 64.4
PIQA (raw acc) 65.7 65.4 64.3
MMLU 25.0 23.3 25.8
HellaSwag 32.6 36.0 35.9
HellaSwag (raw acc) 30.0 31.7 31.5

6/7 vs Supra2-Base and 5/7 vs Supra2-Instruct. HellaSwag is the one benchmark where Supra leads.

Reproduce these numbers

EleutherAI lm-eval-harness v0.4.12, 0-shot, evaluated on the HF repo (do not eval the GGUF — llama.cpp's --multiple-choice path under-reports these tasks; the .hellaswag path is fine):

lm_eval --model hf \
  --model_args pretrained=nkthebass/tinybrainbot-100m-v3-base,dtype=float32 \
  --tasks hellaswag,arc_easy,arc_challenge,openbookqa,winogrande,piqa,mmlu \
  --num_fewshot 0 --batch_size 32

Metrics: acc_norm for HellaSwag / ARC-Easy / ARC-Challenge / OpenBookQA / PIQA; acc for WinoGrande & MMLU.

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer
tok = AutoTokenizer.from_pretrained("nkthebass/tinybrainbot-100m-v3-base")
model = AutoModelForCausalLM.from_pretrained("nkthebass/tinybrainbot-100m-v3-base")
ids = tok("The capital of France is", return_tensors="pt").input_ids
print(tok.decode(model.generate(ids, max_new_tokens=20)[0]))

GGUF

An F16 GGUF is included (tinybrainbot-100m-v3-base-f16.gguf) for llama.cpp / Ollama / LM Studio, with the correct add_space_prefix=false + leading-space template baked in for faithful tokenization.

Limitations

A 100M base model: strong on multiple-choice reasoning for its size, but open-ended generation is limited and can be factually unreliable. For chat use the instruct variant; for arithmetic use the math variant. Not aligned or safety-tuned.

Companion models: instruct · math.

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