o3 Nano on IFEval: score, rank and what it means
o3 Nano scores 78.2 on IFEval, placing it #365 of 600 models in the index. The benchmark average is 78.6 and the leader is Claude Opus 4.5 Pro at 96.1.
Score distribution
The chart shows the top 10 models on IFEval, with o3 Nano highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 2 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
| 3 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 4 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 5 | GPT-5.2 Reasoning | OpenAI | 1000000 | $20.98 | 87.5 |
| 6 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 7 | Gemini 3 Pro Max | Google DeepMind | 2000000 | $20.57 | 87.9 |
| 8 | GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| 9 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 10 | o4 Reasoning | OpenAI | 1000000 | $19.69 | 87.5 |
What this score means
On IFEval, o3 Nano sits at #365 of 600. The leader, Claude Opus 4.5 Pro, scores 96.1, so the gap to the top is 17.9 points. The median model in this index scores 81.2, which puts o3 Nano below the midpoint.
OpenAI models average 89.7 on this benchmark. o3 Nano is 11.5 points below that provider line, so it is a weaker result than the average OpenAI model.
Among mid-range models, the average is 76.5. o3 Nano is 1.7 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 78.2 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 $7.78 per million input tokens, o3 Nano is above the median input price of $4.00 across the 600 models scored on IFEval. 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 |
|---|---|---|---|---|
| DBRX Chat | Databricks | 65536 | $3.07 | 71.7 |
| Auto Reasoning | OpenRouter | 65536 | $8.39 | 71.5 |
| Claude Haiku 4.5 Nano | Anthropic | 8192 | $6.47 | 68.7 |
| Reka Core Mini | Reka AI | 8192 | $7.48 | 70.1 |
| o3 Nano | OpenAI | 32768 | $7.78 | 70.6 |
| Auto Max | OpenRouter | 8192 | $8.41 | 71.2 |
| Firesearch | Fireworks AI | 32768 | $7.03 | 68.5 |
Other benchmarks for o3 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 75.3 | 325 | 46th | |
| GPQA Diamond | 64.8 | 364 | 39th | |
| SWE-bench Verified | 57.9 | 358 | 40th | |
| HumanEval | 72.5 | 377 | 37th | |
| MATH-500 | 74.5 | 339 | 44th | |
| AIME 2025 | 65.6 | 334 | 44th | |
| LiveCodeBench | 60.3 | 365 | 39th | |
| TruthfulQA | 75.4 | 324 | 46th | |
| HellaSwag | 81.4 | 360 | 40th | |
| MMMU | 70.2 | 295 | 51th | |
| Arena Elo | 1354.5 | 355 | 41th |
FAQ
What score does o3 Nano get on IFEval?
o3 Nano scores 78.2 on IFEval in this index. The benchmark average is 78.6 and the top score is 96.1.
How does o3 Nano rank on IFEval?
It ranks #365 of 600 models, in the 39th percentile. The leader is Claude Opus 4.5 Pro at 96.1.
Is o3 Nano good at IFEval?
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 IFEval score calculated?
IFEval is a instruction following 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 o3 Nano cost?
o3 Nano costs $7.78 per million input tokens and $29.81 per million output tokens.