Indicators / series
evidence.open_vs_closed_gap.context.pt
Source: Stanford HAI AI Index (report PDF) (Stanford HAI) · Stanford HAI; cited with attribution · CSV
Stanford HAI, AI Index Report 2025
| id | text | grade | as of date | published date | tier | audited vs reported | extraction method | review status | retrieved at | http status | content hash | supersedes id | url | flags |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 59ae1d37e820c8b9 | AI Index 2025: the best closed model's lead over the best open one on Chatbot Arena fell from 8.04% in January 2024 to 1.70% in February 2025. | grade B, evidence tier 6 | 2025-02-28 | 2025-04-07 | 6 | reported | manual | approved | 2026-09-11 13:55 | 200 | eef7a13bf536 | — | source page |
Raw snippets and dispute text
- 59ae1d37e820c8b9 In early January 2024, the leading closed- weight model outperformed the top open-weight model by 8.04% on the Chatbot Arena Leaderboard. By February 2025, this gap had narrowed to 1.70%.