# THINK4B: THINK4B

> Living preprint · as of 2026-10-25 · map node X-111 (experiment) · interim record, not a final result.

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- [X-111] THINK4B · THINK4B · question: Does the thinking twin of the claim 4B (Qwen3-4B-Thinking-2507 Q4_K_M) on the claim build's fast path, at FAST_THINKING_BUDGET 256 (arm Y) or 512 (arm Z), lift V-para answers vs the instruct 4B (C at L1, claim rows K at L2), and at what time cost? · result: +0.026 (−0.013…+0.068), ×3.7 time. · set V-para; v0.1 (smokes), judge Claude Opus, Claude Haiku (L1), n 51 judged V-para ids (58 generated); slices 20, seeds s42 only (s43 requests prepared, not run), CI −0.013…+0.068 · verdict: not-detected (closed: NO (near-lever), stopped after seed 42 (one seed, not the two-seed verdict the criterion specifies); CLOSED R10 relabels it 'not detected at MDE 0.06')

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Read chapter 6, The deep tier: https://r4topunk.github.io/boar-research/research/deep-tier.md

## Facts cited {#facts}

Resolve every [F-…] marker in https://r4topunk.github.io/boar-research/data/facts.json. Each line gives the claim, the number with its metric family, set and status, judge, n, seeds, CI, date and caveat.

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- [F-184] "20 hardest" slices inflated deltas: +0.091 slice vs +0.026 full (THINK4B); +0.089 vs +0.009 (THINK4B-V02). inflation ×3-10 · set dev (dev, development data) · judge Opus/Haiku · n 20 · seeds UNKNOWN · CI n 20 vs 51/110 · date 2026-10-10
- [F-518] R10 Thinking 4B, V-para: Qwen3-4B-Thinking @512. +0.026 (−0.013…+0.068), ×3.7 time · set UNKNOWN (status UNKNOWN) · judge UNKNOWN · n UNKNOWN · seeds UNKNOWN · CI not computed · caveat: why closed: not detected at MDE 0.06
- [F-1214] Thinking 4B (THINK4B, -V02): Qwen3-4B-Thinking at 256/512 → +0.026 / +0.009 (below +0.03; seed noise)

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Cite as: r4to, independent researcher. RatLab — A Boar Research (2026), research record 1.0, as of 2026-10-25. Text and data CC BY 4.0. Fact ids or a link must travel with a quote. How to cite: https://r4topunk.github.io/boar-research/cite/ · https://r4topunk.github.io/boar-research/CITATION.cff.

AI-reviewed, not clinically reviewed. Nothing here is medical advice.