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What LoopBench measures

You submit a loop specification (LSS YAML). LoopBench:

1. Runs it through LoopGym on fixed task instances
2. Computes Success@k and LES_obs across eight categories
3. Validates your results.json against a published schema
4. Ranks you on the public leaderboard — generalist (grand composite) is the primary rank

loopbench run --suite suite-repair --spec your-loop.yaml --seeds 0,1,2,3,4 -o results.json
loopbench validate results.json
loopbench rank leaderboard/entries.json
loopbench rank leaderboard/entries.json --suite suite-repair

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The measurement stack

flowchart LR
  YOU["Your LSS spec"]
  LB["LoopBench<br/>tasks · scoring · conformance"]
  LG["LoopGym<br/>SimEnv execution"]
  OUT["results.json → leaderboard"]

  YOU --> LB
  LB --> LG
  LG --> LB
  LB --> OUT

Layer	Owns	Repo
Spec	LSS schema, LES formulas	Loop Core Engineering
Data	Trajectories (holdout v0.2)	LoopNet
Runtime	env.run_episode()	LoopGym
Observability	LTF traces, iteration metrics	loop-observability
Measurement	Tasks, LES_obs, anti-gaming	LoopBench

LoopBench defines and scores. LoopGym runs. Never the other way around.

New to the stack? Start with the LoopNet end-to-end tutorial.

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Suites and tasks (v0.2)

19 micro-tasks feed 4 comparison suites. Primary leaderboard rank = generalist (mean of suite scores).

Suite ID	Label	Micro-tasks
suite-repair	Repair & Verify	LB-CR-1, LB-REACT-1, LB-REFLEX-1, LB-OPT-1, LB-SAFE-1
suite-agent	Multi-Agent	LB-MA-1, LB-CREW-1, LB-GRAPH-1, LB-TOT-1, LB-VOTE-1
suite-knowledge	Research & RAG	LB-RS-1, LB-RAG-1, LB-BOOT-1, LB-AUTO-1
suite-rigor	Composition & Safety	LB-COMP-1, LB-NEST-1, LB-SIM-1, LB-HITL-1, LB-MEM-1

loopbench suite list
loopbench run --suite suite-repair --spec your-loop.yaml --seeds 0,1,2,3,4 -o results.json
loopbench run --task LB-CR-1 --spec your-loop.yaml --seeds 0,1,2,3,4 -o results.json

Full catalog in tasks/index.yaml and SUITE-OVERVIEW.md.

Live leaderboard

Live board (updated 2026-06-25) — full rankings

Generalist:

• Loop Engineering maintainer — LES 86.7
• Loop Engineering maintainer (MA-1) — LES 86.5
• Team Thorough — LES 86.4

Submit your loop →

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Validate and reproduce

Post your 60-minute reproduction report on the reproduction challenge after REPRODUCE.md.

Beat maintainer LES (good-first #4)

One command: BEAT_LB-CR-1.md — target LES_obs ≥ 86.7 on LB-CR-1.

Also: BEAT_LB-RS-1.md (81.9) · BEAT_LB-MA-1.md (86.5) · BEAT_LB-COMP-1.md (80.3)

pip install "le-loopforge>=0.2.0" "le-loopctl>=0.1.0" "loopbench>=0.2.0" "loopgym>=0.1.2"
# see BEAT_LB-CR-1.md for full clone + run + submit

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Score in 2 minutes

pip install "le-loopforge>=0.2.0" "le-loopctl>=0.1.0" loopbench loopgym

loopbench suite list

loopbench run \
  --suite suite-repair \
  --spec submissions/examples/spec-fast-loop.yaml \
  --seeds 0,1,2,3,4 \
  -o results.json

loopbench validate results.json
loopbench rank results.json

Submit to the leaderboard: open a PR adding your entry to leaderboard/entries.json.

v0.2 accepts SimEnv submissions (fully reproducible, no API keys). LiveEnv tier is optional.

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Metrics explained

Metric	Meaning
Success@k	Fraction of instances reaching goal threshold
LES_obs	Observed composite ∈ [0, 1] — eight categories
Grand composite	Mean of 4 suite scores — generalist rank
Cost	Estimated USD from LSS cost limits
Robustness	Quality retention across seeds

Display scale 0–100 is optional (les × 100).

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Who this is for

You are…	LoopBench gives you…
Loop designer	A number you can improve release-over-release
Framework author	A neutral arena — not your own benchmark
Researcher	Reproducible tasks + published submission schema
Team lead	Comparable scores across designs and vendors

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Citation

@software{loopbench2026,
  title={LoopBench: Benchmark Suite for Loop Engineering},
  author={Malpani, Kanak},
  year={2026},
  url={https://pypi.org/project/loopbench/}
}