Compare / GPT-5 Nano vs o3 Mini
GPT-5 Nano vs o3 Mini
Which is cheaper, which is more capable, and which does better at each kind of work, from 12 results on 3 sources that measured both models.
GPT-5 Nano or o3 Mini? The short answer
- GPT-5 Nano is cheaper: $0.14 against $1.93 per million tokens, 14 times less.
- They score about the same on the Artificial Analysis Intelligence Index (13.0 and 12.5).
- On our business benchmarks, GPT-5 Nano ranks higher for sticking to the facts.
- On our business benchmarks, o3 Mini ranks higher for reasoning and knowledge and writing.
At a glance
| GPT-5 Nano | o3 Mini | |
|---|---|---|
| Price per million tokens | $0.050 in · $0.40 out | $1.10 in · $4.40 out |
| Blended (3 in : 1 out) | $0.14 | $1.93 |
| Cheapest host, blended | $0.069 (OpenAI) | – |
| Intelligence Index | 13.0 | 12.5 |
| Spring Prompt overall | – | – |
| Output speed, tokens a second | – | – |
| Context window | 400,000 tokens | 200,000 tokens |
| Weights | Closed | Closed |
| Developer based in | the US | the US |
Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.
Which is better for what
Each model's rank among models available today, for each kind of work, from our own benchmarks and licensed sources. The better rank is in green.
| Use case | GPT-5 Nano | o3 Mini |
|---|---|---|
| Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls | 50 of 161 | not measured |
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 131 of 195 | 129 of 195 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | 150 of 187 | 140 of 187 |
| Sticking to the factsSummarising without inventing things, and factual answers | 127 of 153 | 140 of 153 |
Every shared result
| Benchmark | Metric | GPT-5 Nano | o3 Mini |
|---|---|---|---|
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,339 | 1,328 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,247 | 1,301 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,354 | 1,366 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,327 | 1,344 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,338 | 1,348 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,289 | 1,325 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 13.0 | 12.5 |
| Artificial Analysisreported | GPQA Diamond% of questions | 67.6% | 74.8% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 9.5% | 7.9% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 17.4% | 6.8% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 36.5% | 28.7% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 11.7% | 15.3% |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.
Quick answers
Is GPT-5 Nano better than o3 Mini?
It depends on the task. Among models available today, on our benchmarks and licensed sources, GPT-5 Nano ranks higher for sticking to the facts; o3 Mini ranks higher for reasoning and knowledge and writing.
Which is cheaper, GPT-5 Nano or o3 Mini?
GPT-5 Nano costs $0.14 per million tokens (three input to one output), against $1.93 for o3 Mini.
Run GPT-5 Nano and o3 Mini on your own prompt
Benchmarks aren't your data. Try both side by side in the playground, with the cost of every answer.