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ponytail/benchmarks/results/2026-06-12-caveman-vs-ponytail.md
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Emeriko 3b4626a987 feat: skill v2 — output cap, reflex ladder, benchmarks
v1 lost to caveman on tokens/time despite minimal code: it wrote
essays defending each simplification. v2 caps explanation at three
lines and ships the lazy version instead of stalling on necessity
questions. Benchmark: 136.6k tok vs caveman 138.4k, code 47 vs 117
lines across 5 tasks.
2026-06-12 03:54:06 +02:00

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Caveman vs Ponytail — 2026-06-12

5 coding tasks × fresh subagent per config, same model. Tokens = agent total (includes thinking). Code lines = fenced blocks in the deliverable, approx. n=1 per cell — durations carry noise.

Ponytail v1 (before this benchmark)

Task Baseline Caveman Ponytail v1
email 31,971 tok · 104s · ~34 loc 26,464 · 20s · ~25 27,582 · 32s · 6
debounce 23,966 · 25s · ~38 26,496 · 19s · ~36 27,812 · 33s · 6
csv-sum 22,607 · 11s · 6 26,062 · 13s · 6 26,867 · 20s · 7
react-countdown 44,629 · 208s · ~190 26,656 · 21s · ~30 28,748 · 49s · 13
rate-limit 38,782 · 131s · ~25 32,732 · 63s · ~20 32,579 · 93s · ~21
Total 161,955 · 479s · ~293 138,410 · 136s · ~117 143,588 · 228s · ~53

v1 findings

  1. Code minimalism: ponytail dominated (2.2× fewer lines than caveman, 5.5× fewer than baseline).
  2. Total tokens: caveman won by ~4% — ponytail wrote minimal code, then long "skipped on purpose" essays. Prose ate the code savings.
  3. Speed: caveman 136s vs ponytail 228s — ponytail deliberated about what not to build.
  4. Floor effect: on already-minimal tasks (csv-sum) both skills pay ~3k tokens skill-read tax over baseline.

Ponytail v2 (after fixes)

v2 changes: Output cap (code + ≤3 short lines, "if the explanation is longer than the code, delete the explanation"), ladder-is-a-reflex clause (anti-deliberation), ship-and-question rule (never stall on "do you need X?").

Task Ponytail v2 Δ vs v1 Δ vs caveman
email 26,705 · 21s · 5 loc 877 tok · 11s +241 tok · +1s
debounce 27,185 · 25s · 6 627 · 8s +689 · +6s
csv-sum 26,278 · 15s · 6 589 · 5s +216 · +2s
react-countdown 27,598 · 29s · 13 1,150 · 20s +942 · +8s
rate-limit 28,858 · 48s · 17 3,721 · 45s 3,874 · 15s
Total 136,624 · 158s · 47 6,964 (4.8%) · 70s (31%) 1,786 (1.3%) · +22s

Verdict

Area Winner
Code size Ponytail — 47 vs 117 lines (2.5×)
Deliverable prose Ponytail v2 — capped at 3 lines, under caveman's gotcha lists
Total tokens (cost) Ponytail v2 — 136.6k vs 138.4k
Wall time Caveman by 16% (was 68% in v1) — within n=1 noise
Follow-up prevention Ponytail — every skip names its escalation path

Both skills demolish the no-skill baseline: 16% tokens, 3× time, and the baseline's degenerate cases (190-line countdown dashboard, 208s) simply don't happen.