Atlas

Benchmarks

OpenWorldEngineer (Best@8)

Mercor

OpenWorldEngineer mean over its 26 tasks of each task's best rescaled attempt out of 8. It is a task-level extremum, not a confidence bound.

Models
15
Top score
68.3
Leader
Claude Fable 5.2
Updated
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Resolution
—
Saturation
—
Signal
95thpercentile
192 benchmarks from 0.8 to 3.5218 benchmarks from 3.5 to 6.1128 benchmarks from 6.1 to 8.895 benchmarks from 8.8 to 11.567 benchmarks from 11.5 to 14.128 benchmarks from 14.1 to 16.814 benchmarks from 16.8 to 19.49 benchmarks from 19.4 to 22.111 benchmarks from 22.1 to 24.72 benchmarks from 24.7 to 27.46 benchmarks from 27.4 to 30.13 benchmarks from 30.1 to 32.73 benchmarks from 32.7 to 35.45 benchmarks from 35.4 to 38.01 benchmark from 38.0 to 40.71 benchmark from 40.7 to 43.41 benchmark from 43.4 to 46.01 benchmark from 62.0 to 64.6

42nd strongest of 785

Signal-to-noise +19.67 for the OpenWorldEngineer (Mean@8) family

Difficulty
Not estimated

Another benchmark represents this family in the fit.

Organizations
15 dated models · 6 frontier modelsClosed weightsOpen weights
Data: Mercoratlas.village.dev
#ModelSettingScoreSource
1Claude Fable 5.2max · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
68.3
OpenWorldEngineer official leaderboard
2Claude Opus 5.5max · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
58.4
OpenWorldEngineer official leaderboard
3GPT-6 Astramax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
58.3
OpenWorldEngineer official leaderboard
4GPT-6.1 Solmax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
57.1
OpenWorldEngineer official leaderboard
5Claude Sonnet 5.5max · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
52.7
OpenWorldEngineer official leaderboard
6Gemini 4 Carbonhigh · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
51.0
OpenWorldEngineer official leaderboard
7Claude Fable 5.1max · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
45.6
OpenWorldEngineer official leaderboard
8Gemini 4 Argonhigh · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
42.2
OpenWorldEngineer official leaderboard
9Muse Wondermax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
23.6
OpenWorldEngineer official leaderboard
10DeepSeek V4.1 Flashmax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
23.4
OpenWorldEngineer official leaderboard
11GLM-5.3max · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
21.0
OpenWorldEngineer official leaderboard
12Kimi K3.1 Promax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
20.6
OpenWorldEngineer official leaderboard
13Grok 4.7x-high · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
13.8
OpenWorldEngineer official leaderboard
14Beam 1.0 501B A23Bmax · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
8.9
OpenWorldEngineer official leaderboard
15Inklingnot reported · OpenWorld harness (OpenWorldEngineer runner) on Harbor 0.23 with Modal sandboxes; web search over an October 1, 2026 web snapshot as the only network access; task time budgets of 4 to 18 hours
3.8
OpenWorldEngineer official leaderboard
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