Gemini 2.5 Pro vs GPT-5.5
Head to head on 22 shared benchmarks, with price, context window, and release dates.
Benchmark scores
63evals · sort by any column, ⤢ to expand fullscreen
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| GPT-5.5 OpenAI | 54.2% | 68.4% | 1844elo | 78.2 | 51.7% | 76.8% | 13.7% | 46.1% | 84.7% | 82.5% | 73.0% | 87.7% | 49.1% | 86.9% | 88.6% | 68.8% | 51.5% | 47.3% | 75.0% | 49.2% | 69.8% | 69.3% | - | - | - | 86.2% | 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% | 81.1% | 96.3% | 87.7% | - | - | 92.8% | - | 78.7% | 45.3% | 100.0% | 50.0% | - | 4.2 | - | 58.6% | 75.7% | 83.4% | 57.4% | 68.1% | - | 61.9% |
| Gemini 2.5 Pro Google (Alphabet Inc.) | 50.4% | 60.8% | 1419elo | 58.8 | 14.1% | 84.4% | 22.5% | 48.7% | 77.9% | 86.7% | 81.0% | 65.9% | 50.6% | 73.6% | 86.2% | 68.9% | 41.9% | 42.8% | 72.9% | 26.5% | 0.4% | 54.1% | 83.1% | 88.7% | 87.7% | - | - | - | - | - | - | 45.2% | 15.9% | - | - | - | - | - | - | - | - | - | - | - | - | - | 80.1% | 96.7% | - | 70.0% | - | - | - | - | 55.6 | - | 53.6% | - | - | - | - | - | 53.3% | 59.5% |
2 / 2 models
| Attribute | Gemini 2.5 Pro Google (Alphabet Inc.) | GPT-5.5 OpenAI |
|---|---|---|
| Description | Gemini 2.5 Pro is an AI model from Google (Alphabet Inc.). | GPT-5.5 is an AI model from OpenAI. |
| Family | Gemini | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 5 Jun 2025 | 23 Apr 2026 |
| Context | 1,048,576 | 1,050,000 |
| Input $/1M | $1.25 | $5.00 |
| Output $/1M | $10.00 | $30.00 |
| Cache read $/1M | $0.125 | $0.500 |
| Cache write $/1M | $0.375 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file, audio, video | file, image, text |
| Providers | - | - |
| Publisher | Google (Alphabet Inc.) | 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 Gemini 2.5 Pro or GPT-5.5 better?
- Across the 22 benchmarks both models report on Sophon, GPT-5.5 leads on 15 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Gemini 2.5 Pro and GPT-5.5 compare on GPQA Diamond?
- Gemini 2.5 Pro scores 84.4% and GPT-5.5 scores 76.8% on GPQA Diamond.
- Which is cheaper, Gemini 2.5 Pro or GPT-5.5?
- Gemini 2.5 Pro is cheaper at $10.00 per million output tokens against $30.00 for GPT-5.5 - about 3.0x.
- When were Gemini 2.5 Pro and GPT-5.5 released?
- Gemini 2.5 Pro was released 5 Jun 2025 by Google (Alphabet Inc.). GPT-5.5 was released 23 Apr 2026 by OpenAI.
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