o3 Nano on SWE-bench Verified: score, rank and what it means
o3 Nano scores 57.9 on SWE-bench Verified, placing it #358 of 600 models in the index. The benchmark average is 57.5 and the leader is GPT-5.2 Pro at 81.7.
Score distribution
The chart shows the top 10 models on SWE-bench Verified, with o3 Nano highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 2 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 3 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 4 | Claude Sonnet 4.5 Max | Anthropic | 1000000 | $19.90 | 87.2 |
| 5 | GPT-5.2 | OpenAI | 2000000 | $19.71 | 88.0 |
| 6 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 7 | o4 Max | OpenAI | 2000000 | $19.51 | 86.2 |
| 8 | Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| 9 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 10 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
What this score means
On SWE-bench Verified, o3 Nano sits at #358 of 600. The leader, GPT-5.2 Pro, scores 81.7, so the gap to the top is 23.8 points. The median model in this index scores 61.0, which puts o3 Nano below the midpoint.
OpenAI models average 72.7 on this benchmark. o3 Nano is 14.8 points below that provider line, so it is a weaker result than the average OpenAI model.
Among mid-range models, the average is 54.9. o3 Nano is 3.0 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 57.9 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 SWE-bench Verified. 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 |
|---|---|---|---|---|
| Mixtral Turbo Chat | Together AI | 32768 | $3.02 | 71.7 |
| Auto | OpenRouter | 32768 | $7.53 | 70.2 |
| Mixtral Turbo Base | Together AI | 32768 | $2.53 | 69.7 |
| Molmo | Allen Institute for AI | 32768 | $2.49 | 68.5 |
| o3 Nano | OpenAI | 32768 | $7.78 | 70.6 |
| Mixtral Groq Instruct | Groq | 16384 | $3.25 | 72.5 |
| Mixtral Turbo | Together AI | 65536 | $3.20 | 72.4 |
Other benchmarks for o3 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 75.3 | 325 | 46th | |
| GPQA Diamond | 64.8 | 364 | 39th | |
| HumanEval | 72.5 | 377 | 37th | |
| MATH-500 | 74.5 | 339 | 44th | |
| AIME 2025 | 65.6 | 334 | 44th | |
| LiveCodeBench | 60.3 | 365 | 39th | |
| IFEval | 78.2 | 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 SWE-bench Verified?
o3 Nano scores 57.9 on SWE-bench Verified in this index. The benchmark average is 57.5 and the top score is 81.7.
How does o3 Nano rank on SWE-bench Verified?
It ranks #358 of 600 models, in the 40th percentile. The leader is GPT-5.2 Pro at 81.7.
Is o3 Nano good at SWE-bench Verified?
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 SWE-bench Verified score calculated?
SWE-bench Verified is a coding 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.