ActivityNet-QA
Gemini 2.5 Pro Jun 2025 66.7% leads since July 2025 Models answer open-ended questions about web videos of human activities, from 58,000 QA pairs on 5,800 videos. Scored by accuracy.
Many recent papers grade answers with a GPT judge, so scores vary by protocol.
- Released
- June 2019
- Kind
- Video understanding
- Level
- Everyday
- Scored
- Graded by a model
- Answers
- Short answer
- Tasks
- All public
- Strongest model tested
- Gemini 2.5 Pro Jun 2025 #96 on the capability index
- Last in a launch post
- May 2024, dropped before it saturated
- Last model added
- July 2025
In the authors’ words
Recent developments in modeling language and vision have been successfully applied to image question answering. It is both crucial and natural to extend this research direction to the video domain for video question answering (VideoQA). Compared to the image domain where large scale and fully annotated benchmark datasets exists, VideoQA datasets are limited to small scale and are automatically generated, etc. These limitations restrict their applicability in practice. Here we introduce ActivityNet-QA, a fully annotated and large scale VideoQA dataset. The dataset consists of 58,000 QA pairs on 5,800 complex web videos derived from the popular ActivityNet dataset. We present a statistical analysis of our ActivityNet-QA dataset and conduct extensive experiments on it by comparing existing VideoQA baselines. Moreover, we explore various video representation strategies to improve VideoQA performance, especially for long videos. The dataset is available at https://github.com/MILVLG/activitynet-qa
Gemini 2.5 Pro leads with 66.7% among models released by June 2025
Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.
The newest model with a score here came out in June 2025, and nobody has reported a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- Claude Fable 5.2
- Gemini 4 Carbon
- GPT-6 Astra
- Claude Opus 5.5
- and 16 more
- 1 Gemini 2.5 Pro Jun 2025 66.7%
- 2 Gemini 2.5 Flash Jun 2025 65.1%
- 3 GPT-4o May 2024 61.9%
- 4 Gemini 1.5 Pro May 2024 57.5%
- 5 Gemini 1.5 Pro Feb 2024 56.7%
- 6 Gemma 3 27B 52.8%
- 7 Gemma 3 12B 50.4%
- 8 Gemma 3 4B 46.3%
Source: Labs’ model cards
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Gemini 2.5 Pro Jun 2025 | 66.7% | Jul 2025 | Lab model card | |
| 2 | Gemini 2.5 Flash Jun 2025 | 65.1% | Jul 2025 | Lab model card | |
| 3 | GPT-4o May 2024 | 61.9% | May 2024 | Lab model card | |
| 4 | Gemini 1.5 Pro May 2024 | 57.5% | May 2024 | Lab model card | |
| 5 | Gemini 1.5 Pro Feb 2024 | 56.7% | Feb 2024 | Lab model card | |
| 6 | Gemma 3 27B | 52.8% | Mar 2025 | Lab model card | |
| 7 | Gemma 3 12B | 50.4% | Mar 2025 | Lab model card | |
| 8 | Gemma 3 4B | 46.3% | Mar 2025 | Lab model card |
3 models have held number one in labs’ own numbers since 2023
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Labs’ model cards
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Labs’ model cards
No launch post has listed it since May 2024
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| May 14, 2024 | Gemini 1.5 Pro | 57.5 | ActivityNet-QA (test), 0-shot |
| May 13, 2024 | GPT-4o | 61.9 | ActivityNet (%) (test) |
| Feb 15, 2024 | Gemini 1.5 Pro | 56.7 | ActivityNet-QA (test), 0-shot |
5 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| Jul 7, 2025 | Gemini 2.5 Pro technical report | 66.7 | ActivityNet-QA, test, 0-shot, visual-only (Table 6) | Capabilities |
| Jul 7, 2025 | Gemini 2.5 Flash technical report | 65.1 | ActivityNet-QA, test, 0-shot, visual-only (Table 6) | Capabilities |
| Mar 25, 2025 | Gemma 3 4B technical report | 46.3 | ActivityNet-QA, IT, 0-shot, 16 frames, GPT evaluation (Table 17) | Capabilities |
| Mar 25, 2025 | Gemma 3 27B technical report | 52.8 | ActivityNet-QA, IT, 0-shot, 16 frames, GPT evaluation (Table 17) | Capabilities |
| Mar 25, 2025 | Gemma 3 12B technical report | 50.4 | ActivityNet-QA, IT, 0-shot, 16 frames, GPT evaluation (Table 17) | Capabilities |
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