Claim · reasoning

GPT-5.2 (2025-12-11)on GPQA Diamond (Epoch's own run)

73.2 to 91.4 the range across every scoreable measurement we hold
18.2 points between the highest and the lowest
87.9 the number the board uses: the lower median, a real row with its own provenance
5 declared configurations, from 1 runner

All 5 scoreable measurements here come from ONE runner, so this is not a reconciliation and is not presented as one. What it shows is how far a single runner's number moves when the model is run differently.

Every measurement

5 rows. Best first. the board takes the LOWER MEDIAN of the scoreable measurements, which is a real row with its own interval and provenance rather than an interpolated average. a vendor self-report is shown beside the independent numbers and is never one of them; it cannot move a rank.

ScoreProvenanceConfigurationWho ran itWhere to check it
91.4 / 100
as published: 91.4%
 INDEPENDENT
counts toward the ranking
 gpt-5.2-2025-12-11
effort xhigh		 Epoch AI
2025-12-13T09:04:00.000Z
CC-BY-4.0
NO_URL2026-08-30
benchmark leaderboard
the leaderboard for this benchmark, not a link to this row
88.2 / 100
as published: 88.2%
 INDEPENDENT
counts toward the ranking
 gpt-5.2-2025-12-11
effort high		 Epoch AI
2025-12-11T20:49:22.808Z
CC-BY-4.0
NO_URL2026-08-30
benchmark leaderboard
the leaderboard for this benchmark, not a link to this row
87.9 / 100
as published: 87.9%
 INDEPENDENT
counts toward the ranking
 gpt-5.2-2025-12-11
effort medium		 Epoch AI
2025-12-11T20:49:17.803Z
CC-BY-4.0
NO_URL2026-08-30
benchmark leaderboard
the leaderboard for this benchmark, not a link to this row
82.7 / 100
as published: 82.7%
 INDEPENDENT
counts toward the ranking
 gpt-5.2-2025-12-11
effort low		 Epoch AI
2025-12-11T20:25:14.724Z
CC-BY-4.0
NO_URL2026-08-30
benchmark leaderboard
the leaderboard for this benchmark, not a link to this row
73.2 / 100
as published: 73.2%
 INDEPENDENT
counts toward the ranking
 gpt-5.2-2025-12-11
effort none		 Epoch AI
2026-07-13T17:28:07.000Z
CC-BY-4.0
NO_URL2026-08-30
benchmark leaderboard
the leaderboard for this benchmark, not a link to this row
← The Forge Rankings

Snapshot 2026-08-30-62e4e85f043b, manifest dc46131315046f1e, as of 2026-08-30. where only one party has measured a model on a benchmark, this page says so rather than presenting a single number as a reconciliation.