PR Arena

Built by aavetis · released 26 May 2025

A public tracker that counts pull requests opened on GitHub by coding agents (Copilot, Codex, Cursor, Devin, Codegen, Jules) and how many of them were merged. It uses GitHub search queries on branch prefixes and bot authors and refreshes several times a day.

Frontier

96%

Merge rate of ready PRs

Copilot · agent: GitHub Copilot coding agent

23 Sep 2026 · Source: aavetis (benchmark maintainers)

README "Current Statistics" table: 1,548,258 merged of 1,612,469 ready PRs. Codex was at 89.65% (6,343,777 of 7,075,934), Jules 85.47%, Devin 61.94%, Codegen 61.6%. Cursor showed 101.87%, which is a counting artifact, so it is excluded.

Unrated

No fixed reference point (for example Elo scores or field signals).

See the full leaderboard at aavetis

Dots are recorded results; the line is the best result so far; the red dot is the current frontier. Sources for every point are in the table below.

Embed this card

The image names the institutions behind the numbers and links back to this page.

HTML:

<a href="https://canagentswork.com/benchmarks/pr-arena/"><img src="https://canagentswork.com/og/benchmarks-pr-arena.png" width="600" height="315" alt="PR Arena: the best result is 96% (Copilot, 23 Sep 2026)." loading="lazy"></a>

Markdown:

[![PR Arena: the best result is 96% (Copilot, 23 Sep 2026).](https://canagentswork.com/og/benchmarks-pr-arena.png)](https://canagentswork.com/benchmarks/pr-arena/)

What it measures

The share of an agent's non-draft ("ready") pull requests on public GitHub that were merged. The maintainer uses ready PRs rather than all PRs so that agents that open drafts first (Copilot, Codegen) can be compared with agents that open ready PRs directly (Codex). Counts come from GitHub search, for example is:pr head:copilot/ and is:pr author:devin-ai-integration[bot].

Merge rate of ready PRs: Merged PRs divided by non-draft PRs, from GitHub search counts, across all public repositories. Higher is better.

No fixed reference point, so we do not rate its status. Field signal. Merge rates reflect who uses each agent and where, not a controlled task set.

Facts

Grain: Task level: bounded tasks with a clear spec
Environment: field-data
Grading: field-signal
Reuse: No license file in the repo. Data is derived from public GitHub search counts. (unknown)

Limits to keep in mind

Counts depend on GitHub search heuristics (branch prefixes such as head:copilot/ and bot authors). Agent PRs that do not match these patterns are not counted. Source
The merged count can exceed the ready count. On 2026-09-23 Cursor showed 910,955 merged against 894,225 ready PRs (a 101.87% rate). The maintainer does not explain the cause. We do not show Cursor as the frontier for this reason. Source
Merge rate is a selection signal, not a quality score. Agents that require a human to mark a PR ready (Copilot) get a high ready-PR merge rate because humans filter first. Source

Recorded results

A selection that shows the frontier over time. The full leaderboard is at the source.

System	Merge rate of ready PRs	Date	Source
Copilot · frontier	96%	23 Sep 2026	aavetis · primary
Codex	89.7%	23 Sep 2026	aavetis · primary
Copilot	95.1%	10 Jan 2026	aavetis · primary
Codex	85.8%	26 May 2025	aavetis · primary
Copilot	75.9%	26 May 2025	aavetis · primary

Timeline

26 May 2025 — PR Arena starts tracking agent pull requests on GitHub. Source

Where it sits in the atlas

Software engineering

Shipping pull requests

Go to the source

Website prarena.ai
Full leaderboard prarena.ai
Code github.com
Dataset github.com

Last checked 23 Sep 2026 against 5 primary sources, with a second independent check. See an error? Tell us.

How to cite

Credit the original work first: PR Arena by aavetis.

Then, if you used this page:

Can Agents Work. "PR Arena: frontier results and sources." https://canagentswork.com/benchmarks/pr-arena/ (accessed 2026-09-24). CC BY 4.0.

@misc{caw-pr-arena,
  title        = {{PR Arena: frontier results and sources}},
  author       = {{Can Agents Work}},
  year         = {2026},
  howpublished = {\url{https://canagentswork.com/benchmarks/pr-arena/}},
  note         = {Accessed 2026-09-24. CC BY 4.0}
}