GPT-4o-mini vs GPT-5.5
Head to head on 13 shared benchmarks, with price, context window, and release dates.
Benchmark scores
75evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| GPT-5.5 OpenAI | 68.4% | 1844elo | 76.8% | 13.7% | 46.1% | 84.7% | 82.5% | 73.0% | 87.7% | 88.6% | 68.8% | 47.3% | 75.0% | - | - | - | - | - | 86.2% | 54.2% | 12.9% | 36.2% | - | - | 86.0% | 90.0% | 100.0% | - | 1315elo | 78.2 | 34.0% | 51.8% | 5.7% | 51.7% | 44.8% | 24.9% | 1769elo | 15.1% | - | - | 51.8% | - | 2.1% | - | 81.1% | 96.3% | 87.7% | - | - | 92.8% | 49.1% | - | 86.9% | - | 78.7% | 45.3% | 100.0% | 50.0% | 51.5% | - | 4.2 | 58.6% | - | 75.7% | 83.4% | 49.2% | - | 57.4% | 68.1% | 69.8% | - | - | - | - | 69.3% | 61.9% |
| GPT-4o-mini OpenAI | 45.5% | 871elo | 42.6% | 4.2% | 31.0% | 47.2% | 43.0% | 65.8% | 32.9% | 64.8% | 54.5% | 22.9% | 60.5% | 16.7% | 3.6% | 11.7% | 14.7% | 50.7% | - | - | - | - | 0.29 | 0.0% | - | - | - | 0.0% | - | - | - | - | - | - | - | - | - | - | 0.0% | 1.54 | - | 0.0% | - | 72.0% | - | - | - | 23.4% | 78.9% | - | - | 62.8% | - | 78.0% | - | - | - | - | - | 3.81 | - | - | 100.0% | - | - | - | 0.36 | - | - | - | 0.78 | 83.3% | 54.5% | 22.5% | - | 39.6% |
2 / 2 models
| Attribute | GPT-4o-mini OpenAI | GPT-5.5 OpenAI |
|---|---|---|
| Description | GPT-4o 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 | 18 Jul 2024 | 23 Apr 2026 |
| Context | 128,000 | 1,050,000 |
| Input $/1M | $0.15 | $5.00 |
| Output $/1M | $0.60 | $30.00 |
| Cache read $/1M | $0.075 | $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-4o-mini or GPT-5.5 better?
- Across the 13 benchmarks both models report on Sophon, GPT-5.5 leads on 13 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-4o-mini and GPT-5.5 compare on GPQA Diamond?
- GPT-4o-mini scores 42.6% and GPT-5.5 scores 76.8% on GPQA Diamond.
- Which is cheaper, GPT-4o-mini or GPT-5.5?
- GPT-4o-mini is cheaper at $0.60 per million output tokens against $30.00 for GPT-5.5 - about 50.0x.
- When were GPT-4o-mini and GPT-5.5 released?
- GPT-4o-mini was released 18 Jul 2024 by OpenAI. GPT-5.5 was released 23 Apr 2026 by OpenAI.
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