o4 Nano on HellaSwag: score, rank and what it means
o4 Nano scores 81.2 on HellaSwag, placing it #363 of 600 models in the index. The benchmark average is 81.4 and the leader is GPT-5.2 Max at 96.1.
Score distribution
The chart shows the top 10 models on HellaSwag, with o4 Nano highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 2 | GPT-5.2 Turbo | OpenAI | 1000000 | $20.73 | 87.4 |
| 3 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 4 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 5 | Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| 6 | Grok 4 Reasoning | xAI | 2000000 | $19.67 | 87.8 |
| 7 | GPT-5.2 Vision | OpenAI | 1000000 | $19.03 | 87.4 |
| 8 | Gemini 3 Pro Turbo | Google DeepMind | 400000 | $19.62 | 86.4 |
| 9 | GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| 10 | o4 Pro | OpenAI | 1000000 | $19.37 | 87.3 |
What this score means
On HellaSwag, o4 Nano sits at #363 of 600. The leader, GPT-5.2 Max, scores 96.1, so the gap to the top is 14.9 points. The median model in this index scores 83.6, which puts o4 Nano below the midpoint.
OpenAI models average 90.5 on this benchmark. o4 Nano is 9.3 points below that provider line, so it is a weaker result than the average OpenAI model.
Among mid-range models, the average is 79.8. o4 Nano is 1.4 points above that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 81.2 as a relative signal, not an absolute guarantee. Benchmark scores depend on prompt format, evaluation harness and contamination controls. Use this page to narrow the shortlist, then test the model on your own data.
Price context
At $8.61 per million input tokens, o4 Nano is above the median input price of $4.00 across the 600 models scored on HellaSwag. The models immediately around it in the ranking are shown below so you can compare score and price together.
| Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|
| OLMo 2 Base | Allen Institute for AI | 65536 | $2.39 | 67.4 |
| o3 Nano | OpenAI | 32768 | $7.78 | 70.6 |
| Claude Haiku 4.5 Mini | Anthropic | 16384 | $8.76 | 71.6 |
| Firesearch Pro | Fireworks AI | 32768 | $7.67 | 70.4 |
| o4 Nano | OpenAI | 65536 | $8.61 | 72.0 |
| Auto | OpenRouter | 32768 | $7.53 | 70.2 |
| Claude 3.7 Sonnet Nano | Anthropic | 65536 | $6.93 | 68.9 |
Other benchmarks for o4 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 74.9 | 339 | 44th | |
| GPQA Diamond | 67.3 | 327 | 46th | |
| SWE-bench Verified | 62.3 | 272 | 55th | |
| HumanEval | 74.7 | 350 | 42th | |
| MATH-500 | 74.0 | 349 | 42th | |
| AIME 2025 | 64.2 | 354 | 41th | |
| LiveCodeBench | 65.9 | 278 | 54th | |
| IFEval | 81.6 | 286 | 52th | |
| TruthfulQA | 75.2 | 327 | 46th | |
| MMMU | 70.2 | 296 | 51th | |
| Arena Elo | 1374.8 | 294 | 51th |
FAQ
What score does o4 Nano get on HellaSwag?
o4 Nano scores 81.2 on HellaSwag in this index. The benchmark average is 81.4 and the top score is 96.1.
How does o4 Nano rank on HellaSwag?
It ranks #363 of 600 models, in the 40th percentile. The leader is GPT-5.2 Max at 96.1.
Is o4 Nano good at HellaSwag?
It is below the median for this benchmark, so test it carefully before relying on it for this capability. The result should be read alongside its price and context window.
How is the HellaSwag score calculated?
HellaSwag is a commonsense benchmark. Scores in this index are modelled estimates on a 0–100 scale (or Elo for Arena), derived from capability tier and benchmark difficulty. They are not official leaderboard results.
What does o4 Nano cost?
o4 Nano costs $8.61 per million input tokens and $41.97 per million output tokens.