GPT-5.1 Nano on SWE-bench Verified: score, rank and what it means
GPT-5.1 Nano scores 63.1 on SWE-bench Verified, placing it #251 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 GPT-5.1 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, GPT-5.1 Nano sits at #251 of 600. The leader, GPT-5.2 Pro, scores 81.7, so the gap to the top is 18.6 points. The median model in this index scores 61.0, which puts GPT-5.1 Nano above the midpoint.
OpenAI models average 72.7 on this benchmark. GPT-5.1 Nano is 9.6 points below that provider line, so it is a weaker result than the average OpenAI model.
Among multimodal models, the average is 66.4. GPT-5.1 Nano is 3.3 points below that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 63.1 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 $9.56 per million input tokens, GPT-5.1 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 |
|---|---|---|---|---|
| o3 Mini | OpenAI | 128000 | $10.68 | 76.2 |
| Reka Flash Turbo | Reka AI | 128000 | $10.19 | 75.1 |
| Seed-OSS Instruct | ByteDance | 128000 | $3.79 | 76.0 |
| Llama 3 Novita Instruct | Novita AI | 32768 | $3.94 | 75.6 |
| GPT-5.1 Nano | OpenAI | 32768 | $9.56 | 74.1 |
| Llama 3 Anyscale | Anyscale | 65536 | $3.94 | 74.7 |
| Sonar Max | Perplexity | 32768 | $11.60 | 77.8 |
Other benchmarks for GPT-5.1 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 77.0 | 278 | 54th | |
| GPQA Diamond | 71.2 | 235 | 61th | |
| HumanEval | 76.1 | 328 | 45th | |
| MATH-500 | 79.5 | 220 | 63th | |
| AIME 2025 | 66.1 | 328 | 45th | |
| LiveCodeBench | 63.9 | 323 | 46th | |
| IFEval | 82.6 | 257 | 57th | |
| TruthfulQA | 78.1 | 253 | 58th | |
| HellaSwag | 85.5 | 227 | 62th | |
| MMMU | 72.0 | 243 | 60th | |
| Arena Elo | 1378.2 | 280 | 53th |
FAQ
What score does GPT-5.1 Nano get on SWE-bench Verified?
GPT-5.1 Nano scores 63.1 on SWE-bench Verified in this index. The benchmark average is 57.5 and the top score is 81.7.
How does GPT-5.1 Nano rank on SWE-bench Verified?
It ranks #251 of 600 models, in the 58th percentile. The leader is GPT-5.2 Pro at 81.7.
Is GPT-5.1 Nano good at SWE-bench Verified?
Yes, relative to the index: it is above the median and inside the top half of scores. 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 GPT-5.1 Nano cost?
GPT-5.1 Nano costs $9.56 per million input tokens and $43.06 per million output tokens.