---
license: apache-2.0
base_model: allenai/Olmo-3-1025-7B
tags:
- code
- livecodebench
- sft
- lora-merged
- nothink
library_name: transformers
---

# code-nothink-o7b-20260908

Formerly `Olmo-3-1025-7B-code-v4-nothink` (HF redirect).

**Arm ID:** `O7B-NOTHINK`  
**Run ID:** `t30b2507-o7b-nothink-v4-tail151643`

Merged full bf16 weights used for the official DEV256 NoThink evaluation. Tokenizer files in this repo are the **eval-caliber** bundle (`olmo3-lcb-noprefill`); they overlay any tokenizer files that were present in the merge directory.

**Single-seed exploratory result, not a preregistered confirmatory claim.**

## Base model

- Hugging Face: [`allenai/Olmo-3-1025-7B`](https://huggingface.co/allenai/Olmo-3-1025-7B)
- Revision: `a81bae42db3975be1671e27b9c9a56da1a9f980f` (from `RUN_IDENTITY.json` / local snapshot `/workspace/code-sft-infra/models/olmo-3-1025-7b`)

## Training

- Method: LoRA r64 / α128 on seven projections (`q_proj`, `k_proj`, `v_proj`, `o_proj`, `gate_proj`, `up_proj`, `down_proj`), then merged into full-model bf16 safetensors
- Data: NoThink code SFT (paired V4, physical 2-epoch concat)
- Endpoint (score): **step 140**, **9,371,874** assistant tokens — endpoint-as-score, no checkpoint picking
- Train seed 42; LR `1e-4`; context 8192; AdamW; cosine by assistant-token dose
- Host: local GPU box; eval tokenizer renderer `olmo3-lcb-noprefill`

## Evaluation

- Suite: official LiveCodeBench **DEV256**
- Seed **3407**, mode **NoThink**, `max_model_len` **8192**, vLLM **0.28.0**
- Metric: sandbox pass@1 = passed / 256
- This arm: **46/256 (18.0%)**, caps **107**
- Base (`allenai/Olmo-3-1025-7B`, same NoThink protocol): **20/256 (7.8%)**, caps **95**
- McNemar exact p = **6.9e-05**

## Inference notes

- Use **this repository's** tokenizer and `chat_template.jinja`.
- This chat template is the **no-prefill `<think>`** variant (`olmo3-lcb-noprefill`): do not prefill `<think>` at the start of the assistant turn.
- Stop token ids: **100257** (`<|endoftext|>`) and **100265** (`<|im_end|>`).
- Eval sampling used temperature 0.7, top_p 0.8, top_k 20.

## Weight checksum

- `model.safetensors` (14,596,063,960 bytes): `sha256:ce853010b5de765a4f0a393cc77fe84d24305b567486473dd3ef8028fa4c9e1f`

`OFFICIAL_MERGE_RECEIPT.json` is included for merge provenance. LoRA adapter checkpoints are **not** in this repo.