# SlopCodeBench

> Source: <https://www.scbench.ai>
> Published: 2026-07-28 01:06:13+00:00

# SlopCodeBench

A community benchmark measuring code erosion as agents iteratively extend their own solutions across checkpoints.

### top 10 models

[full leaderboard →](/leaderboard)

- 01GPT 5.5/Codex28.1%0.4940.269
- 02GPT 5.3-Codex/Codex26.0%0.6440.336
- 03GPT 5.4/Codex25.5%0.2780.193
- 04GPT 5.2-Codex/Codex21.9%0.7280.398
- 05Opus 4.6/Claude Code20.9%0.7370.318
- 06Opus 4.7/Claude Code20.9%0.7590.357
- 07KIKimi K2.6/Kimi CLI18.9%0.7640.399
- 08Opus 4.5/Claude Code17.3%0.6910.297
- 09Sonnet 4.6/Claude Code16.8%0.7410.316
- 10Composer 2/Cursor CLI16.3%0.7160.353

## Featured Problems

[browse all →](/problems)

## Overview

SlopCodeBench evaluates coding agents the way real software actually gets built: through repeated requirement changes and extensions. Each problem is a sequence of checkpoints — the agent implements an initial version, then extends its own solution as new requirements arrive. Evaluation is black-box: only a CLI or API contract is given, with no prescribed architecture, function signatures, or module boundaries, so early design decisions compound across the run. Beyond correctness, we measure code erosion — verbosity, dead branches, and redundant structure — to surface the agents that stay clean under sustained change instead of patching their way into slop.

Supported by

Special thanks to [Snorkel AI](https://snorkel.ai) for supporting this work through the Open Benchmarks Grant.