Gemini 3.5 vs o3
Direct spec comparison of Gemini 3.5 (from Google) and o3 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Gemini 3.5 |  o3OpenAI | |
|---|---|---|
| Vendor | OpenAI | |
| Family | Gemini | o-series |
| Release date | 2026-05-20 | 2025-04-16 |
| Context window | 2,000,000 tokens | 200,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio, video | text, vision |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026. | Reasoning-focused model in the o-series. |
| Links | ||
| Benchmarks | ||
| MMLU-Pro | 88.9% | — |
| GPQA-D | 91.2% | 87.7% |
| AIME-25 | 96.1% | 88.9% |
| MMMU | 86.0% | — |
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