---
license: mit
language:
  - code
task_categories:
  - text-generation
size_categories:
  - n<1K
pretty_name: "COIN — COde-understanding through INput-space mapping"
tags:
  - benchmark
  - fuzzing
  - reachability
  - code-understanding
  - oss-fuzz
configs:
  - config_name: default
    data_files:
      - split: gcs_reachable
        path: data/gcs_reachable.jsonl
      - split: codeql_only
        path: data/codeql_only.jsonl
coin_version: "v2026-07"
coin_commit: "e99b764ba8d7a546e425666851b81545bc800f63"
oss_fuzz_commit: "d87225267726cf7ce1a3e17cf103c5ac943c4f05"
coverage_date: "20260504"
---

# COIN v2026-07

**COde-understanding through INput-space mapping** — a benchmark that
measures an agent's ability to translate a natural-language reachability
goal ("reach line X of file Y") into an input that exercises that line at
runtime.

This release pins **70 verified targets** drawn from
7 OSS-Fuzz projects. Every target is paired
with a runtime docker image whose digest is captured below — a snapshot is
content-addressed end-to-end, so reruns six months from now hit the same
binaries.

## Quick start

```python
from datasets import load_dataset

ds = load_dataset(
    "COIN-Bench/coin",
    revision="v2026-07",
    split="codeql_only",
)
print(ds[0]["target_id"], ds[0]["runtime_image"])
```

To run the full evaluation pipeline against this snapshot:

```bash
pip install coin-bench
coin evaluate \
  --dataset COIN-Bench/coin \
  --revision v2026-07 \
  --split codeql_only \
  --output-dir results/
```

## Splits

Splits are first-match-wins over the 6-bit signal cube
``(G, S, N, F, L, C)`` — GCS-covered, seed-reachable, fuzzer-reachable
(libfuzzer-noseed), baseline-reachable (libfuzzer), LLM-baseline-reachable,
CodeQL-statically-reachable.

| Split | Cell | Rows |
|---|---|---|| `gcs_reachable` | `G and not (F or L)` | 35 || `codeql_only` | `C and not (G or F or L)` | 35 |
## Runtime images

One per project. Digest-pinned for reproducibility — the dataset rows
reference these digests directly.

| Project | Image | Digest | Size |
|---|---|---|---|| `cups` | `localhost:5000/cointest/runtime-cups:v2026-07-test1` | `sha256:986901f42872c2d3f3705368e9546e9f792efc957a11541540c4232fb7eaf36d` | 2698.4 MB || `cyclonedds` | `localhost:5000/cointest/runtime-cyclonedds:v2026-07-test1` | `sha256:ebce3ee4f0439dc4137e4102d12d1b0958882af2e519a441e1203be06da72dfd` | 3658.2 MB || `hdf5` | `localhost:5000/cointest/runtime-hdf5:v2026-07-test1` | `sha256:23dac6e302371f1fa5341a1e54d537d41168b125a39a1e902464700daaae91a6` | 5762.2 MB || `karchive` | `localhost:5000/cointest/runtime-karchive:v2026-07-test1` | `sha256:4c7ea95f50529f13a86fe490cdcd779b3d1c7e699916bda4212dc780d1082665` | 14784.0 MB || `liboqs` | `localhost:5000/cointest/runtime-liboqs:v2026-07-test1` | `sha256:b00578ef6bc10a015619ddcf614cb217e8a1ecae49b3da9eba084a3db59e604a` | 4118.4 MB || `libraw` | `localhost:5000/cointest/runtime-libraw:v2026-07-test1` | `sha256:faa3f5de1db16c0f6b9968ee796375be742b5d8b30f6659ad6150a347c076133` | 2164.6 MB || `rdkit` | `localhost:5000/cointest/runtime-rdkit:v2026-07-test1` | `sha256:3361dd349cc9e92dfe48e664b1c0fe61eeadf62cc08834e8f9ae28187f283320` | 12781.0 MB |
## Schema

| Column | Type | Meaning |
|---|---|---|
| `target_id` | str | `<project>:<harness>:<file>:<line_start>[-<line_end>]` |
| `coin_version` | str | snapshot tag (e.g. `v2026-07`) |
| `coin_commit` | str | git SHA of the COIN repo at release time |
| `oss_fuzz_commit` | str | OSS-Fuzz commit pinned for this snapshot |
| `coverage_date` | str | GCS HTML coverage report date |
| `project` | str | OSS-Fuzz project name |
| `harness` | str | primary reaching harness binary |
| `harness_binaries` | str (JSON list) | harness binary basenames in the project |
| `language` | str | `c` / `c++` / `rust` / `python` / `jvm` |
| `file` | str | canonical `/src/<project>/<rel>` path |
| `line_start`, `line_end`, `line_count` | int | target line range |
| `function` | str | enclosing function (empty if not extracted) |
| `source_snippet` | str | ±100 lines around the target |
| `src_commits` | str (JSON list) | `[{path, rev, url}]` for git-cloning |
| `gcs_covered` | bool | `G` signal — line in the GCS coverage report |
| `baseline_reachable` | str (JSON list or "null") | `F` — stage5 libfuzzer baseline (with seed if present) |
| `agent_baseline_reachable` | str (JSON list or "null") | `L` — LLM seed-gen baseline |
| `codeql_reachable` | str (JSON list or "null") | `C` — CodeQL static reachability |
| `cnt` | int | observed coverage count from GCS |
| `coverage_keys` | str (JSON list) | path synonyms for verify-server matching |
| `target_text` | str | one-line human description |
| `prompt_preview` | str | TASK.md preview that stage7 sends to the agent |
| `runtime_image` | str | `<image>@sha256:...` — the image to spin up |
| `runtime_digest` | str | the digest alone, for content addressing |
| `runtime_normal_path` | str | path inside the image: harness binaries (`/out/normal`) |
| `runtime_coverage_path` | str | path inside the image: coverage build (`/out/coverage`) |
| `runtime_source_path` | str | path inside the image: source repos (`/src`) |
| `split` | str | denormalized split name (matches the row's file) |

## What's automated, what's manual

| Step | Type |
|---|---|
| OSS-Fuzz coverage HTML download | manual (operator) |
| Per-project build (normal + coverage) | manual (operator) |
| Baseline fuzzing (stages 5 + 5b) | manual (operator) |
| Target selection (stage 6) | manual (operator) |
| Snapshot release (`coin release`) | manual command, fully reproducible |
| Evaluation against this snapshot | **fully automated** for downstream users |

The selection pipeline is operator-driven; once a snapshot is published,
running it against your agent is one command.

## Provenance

* **COIN repo**: https://github.com/coin-bench/coin @ `e99b764ba8d7a546e425666851b81545bc800f63`
* **Source experiment**: `20260520T165657Z-b45032068f`
* **Created at**: `2026-07-04T18:44:29.380721+00:00`
* **Total runtime image footprint**: 44.9 GB

## License

MIT — see the COIN repository for full terms. Source code referenced from
each row remains under its upstream project's license.

## Citation

```bibtex
@misc{coinv202607,
  title  = {COIN: COde-understanding through INput-space mapping (v2026-07)},
  author = {COIN Authors},
  year   = {2026},
  url    = {https://huggingface.co/datasets/COIN-Bench/coin/tree/v2026-07}
}
```