GPT-5 Mini vs GPT-5.5
Head to head on 25 shared benchmarks, with price, context window, and release dates.
Benchmark scores
92evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.5 OpenAI | 68.4% | 1844elo | 78.2 | 51.7% | 76.8% | 13.7% | 46.1% | 84.7% | 82.5% | 81.1% | 73.0% | 87.7% | 96.3% | 87.7% | 49.1% | 86.9% | 88.6% | 68.8% | 50.0% | 51.5% | 47.3% | 75.0% | 49.2% | 69.8% | 69.3% | - | - | 86.2% | 54.2% | - | 12.9% | - | - | - | 36.2% | - | - | - | - | 86.0% | 90.0% | 100.0% | - | - | - | - | - | 1315elo | 34.0% | - | 51.8% | - | 5.7% | 44.8% | 24.9% | 1769elo | - | - | 15.1% | - | 51.8% | - | - | 2.1% | - | - | - | - | 92.8% | - | 78.7% | 45.3% | 100.0% | - | - | 4.2 | - | - | 58.6% | 75.7% | 83.4% | - | - | - | - | - | 57.4% | 68.1% | - | - | - | - | 61.9% |
| GPT-5 Mini OpenAI | 60.2% | 1310elo | 56.2 | 27.2% | 68.7% | 5.1% | 45.6% | 69.1% | 68.2% | 55.2% | 65.3% | 75.5% | 82.2% | 68.3% | 43.0% | 80.6% | 77.5% | 66.9% | 9.0% | 43.0% | 36.9% | 75.2% | 14.4% | 14.2% | 31.9% | 0.0% | 46.7% | - | - | 0.0% | - | 1.13 | 0.0% | -0.15 | - | 20.0% | 25.0% | 40.0% | 1.7 | - | - | - | 100.0% | 18.1% | 2.8% | 100.0% | 66.7% | - | - | 0.0% | - | 88.3% | - | - | - | - | 60.0% | 100.0% | - | 90.0% | - | 47.2% | 80.0% | - | 54.5% | 0.0% | 1.54 | 1.54 | - | 80.0% | - | - | - | 16.8% | 4.95 | - | 39.7% | 59.8% | - | - | - | 0.0% | 9.5% | 0.0% | 86.1% | 0.49 | - | - | 39.21 | 272.11 | 86.0% | 86.0% | 47.9% |
2 / 2 models
| Attribute | GPT-5 Mini OpenAI | GPT-5.5 OpenAI |
|---|---|---|
| Description | GPT-5 mini is an AI model from OpenAI. | GPT-5.5 is an AI model from OpenAI. |
| Family | GPT | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 7 Aug 2025 | 23 Apr 2026 |
| Context | 400,000 | 1,050,000 |
| Input $/1M | $0.25 | $5.00 |
| Output $/1M | $2.00 | $30.00 |
| Cache read $/1M | $0.025 | $0.500 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | file, image, text |
| Providers | - | - |
| Publisher | OpenAI | OpenAI |
| Reported scores | GPQA Diamond76.8% (AA) Humanity's Last Exam (HLE)13.7% (AA) IFBench46.1% (AA) SciCode47.3% (AA) τ²-bench (Tau²-bench)69.3% (AA) |
FAQ
- Is GPT-5 Mini or GPT-5.5 better?
- Across the 25 benchmarks both models report on Sophon, GPT-5.5 leads on 24 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-5 Mini and GPT-5.5 compare on GPQA Diamond?
- GPT-5 Mini scores 68.7% and GPT-5.5 scores 76.8% on GPQA Diamond.
- Which is cheaper, GPT-5 Mini or GPT-5.5?
- GPT-5 Mini is cheaper at $2.00 per million output tokens against $30.00 for GPT-5.5 - about 15.0x.
- When were GPT-5 Mini and GPT-5.5 released?
- GPT-5 Mini was released 7 Aug 2025 by OpenAI. GPT-5.5 was released 23 Apr 2026 by OpenAI.
Comparing something else? Build your own side-by-side.