Artificial Analysis launches FrontierCode 1.1 leaderboard for Cognition's coding benchmark
Overview
Artificial Analysis has launched a leaderboard for FrontierCode 1.1, a private coding benchmark built by Cognition with maintainers of 36 open source repositories.
The benchmark scores whether a model's changes would be merged by maintainers, and it penalizes excessive changes, out-of-scope file edits, and unhelpful tests, not only failing tests. Claude Opus 5.5 (max with fallback) leads with a 52% average score and a 58% pass rate, and nine of 100 tasks went unsolved by every model tested.
Artificial Analysis says an attempt that fails any blocking check scores zero, and one that passes them all scores between 70% and 100%. GPT-6.1 Sol (max) scores 49% at $0.81 per task, matching Claude Fable 5.1 (max with fallback) at less than a tenth of the cost. All tasks are kept private to avoid contamination.
Written by AI from the articles below · updated Oct 12, 2:02 PM ET
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Developments
2 developments
- Oct 12, 1:51 PM ET · 1 articleArtificial Analysis publishes FrontierCode results from Cognition's new benchmarkArtificial Analysis: Artificial Analysis highlights FrontierCode, a Cognition coding benchmark
- Oct 12, 12:00 AM ET · 2 articlesArtificial Analysis launches FrontierCode 1.1 leaderboardArtificial Analysis Articles: Artificial Analysis launches FrontierCode benchmark for maintainer-merge coding tasks
Article timeline
The articles in this story. Times are ET.
Artificial Analysis@ArtificialAnlysOfficialArtificial Analysis highlights FrontierCode, a Cognition coding benchmarkAIArtificial Analysis links to full results for FrontierCode, a new evaluation introduced by Cognition. The post includes no scores, models, or methodology details beyond the links to the Artificial Analysis evaluation page and Cognition's blog post.
Artificial Analysis@ArtificialAnlysOfficialArtificial Analysis launches FrontierCode 1.1 leaderboard for maintainer-ready codingAIArtificial Analysis launches a leaderboard for FrontierCode 1.1, a private coding benchmark from Cognition that grades whether changes would be merged by repository maintainers. Claude Opus 5.5 (max with fallback) leads at 52%, and nine of 100 tasks went unsolved by every model tested. GPT-6.1 Sol (max) scores 49% at $0.81 per task, matching Claude Fable 5.1 (max with fallback) at less than a tenth of the cost.

- Artificial Analysis ArticlesOfficialArtificial Analysis launches FrontierCode benchmark for maintainer-merge coding tasks
AIArtificial Analysis launched FrontierCode 1.1, a coding benchmark built by Cognition with maintainers of 36 open source repositories. Claude Opus 5.5 (max with fallback) leads with a 52% average score and a 58% pass rate, and leading models still fail more than 40% of the time. The benchmark also penalizes excessive changes, out-of-scope file edits, and unhelpful tests, not just failing tests.
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