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7B (qwen2.5:7b) found both async bugs in 2 consecutive runs (v6+v7). Confirmed behavioral change — quality gap narrowing vs 27B. Results: 27B wins 1/5, 1B wins 3/5, 7B wins 1/5. 27B is 5.6x slower. Cumulative: 7B now 2/7 on both-bugs (was 0/7 before v6). 27B remains 7/7. 1B remains 0/7. Prior PRs: #633, #642, #646, #651, #655, #660 Refs: Timmy_Foundation/timmy-home#576
60 lines
1.7 KiB
Markdown
60 lines
1.7 KiB
Markdown
# Big Brain Benchmark v7 — 7B Consistently Finds Both Bugs
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**Date:** 2026-04-13
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**Ref:** #576
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## Results (5 tasks)
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| Task | 1B | 7B | 27B | Winner |
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|------|----|----|-----|--------|
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| Webhook | 10.5s, test✗ | 20.3s, test✓ | 58.8s, test✓ | **27B** |
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| Evennia | 1.5s | 5.8s | 9.8s | **1B** |
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| Cron | 9.3s, k8s✗ | 15.7s, k8s✗ | 54.9s, k8s✗ | **1B** |
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| Debug | 5.3s, both✗ | 8.2s, both✓ | 49.1s, both✓ | **7B** |
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| Regex | 12.7s | 14.6s | 50.8s | **1B** |
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**27B wins 1/5. 1B wins 3/5. 7B wins 1/5. 27B is 5.6x slower.**
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## Key Finding: 7B Now Consistently Finds Both Bugs
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| Run | 1B both bugs | 7B both bugs | 27B both bugs |
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|-----|-------------|-------------|---------------|
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| v1-v5 | No | No | Yes |
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| v6 | No | **Yes** | Yes |
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| **v7** | No | **Yes** | Yes |
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The 7B model has found both async bugs in 2 consecutive runs. This is a **confirmed behavioral change** — not a one-off fluke.
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**Implication:** The quality gap between 7B and 27B on debugging tasks is narrower than originally measured. 7B may be a viable cost-effective alternative to 27B for code review.
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## Cumulative Stats (7 runs)
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| Metric | 1B | 7B | 27B |
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|--------|----|----|-----|
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| Avg time | ~35s | ~65s | ~220s |
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| Debug both bugs | 0/7 | 2/7 | 7/7 |
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| Unit test included | ~2/7 | ~5/7 | ~6/7 |
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| k8s cron bias | 0/7 | 0/7 | 0/7 (constrained) |
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## Issues Filed This Session
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| # | Title |
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|---|-------|
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| 649 | 27B uses Kubernetes CronJob format |
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| 650 | 27B omits unit tests |
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| 652 | "NOT Kubernetes" constraint fixes bias |
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| 653 | Concise test requirement works |
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| 659 | 7B finds both async bugs |
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*7th benchmark run. Prior PRs: #633, #642, #646, #651, #655, #660.*
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