Gemini 2.5 Flash vs o3
Direct spec comparison of Gemini 2.5 Flash (from Google) and o3 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Gemini 2.5 Flash |  o3OpenAI | |
|---|---|---|
| Vendor | OpenAI | |
| Family | Gemini | o-series |
| Release date | 2025-06-17 | 2025-04-16 |
| Context window | 1,000,000 tokens | 200,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio | text, vision |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Google's cost-and-latency-optimized Gemini 2.5 variant. Generally available June 2025 — designed for high-throughput agentic workflows with sub-second first-token latency. | Reasoning-focused model in the o-series. |
| Links | ||
| Benchmarks | ||
| GPQA-D | — | 87.7% |
| AIME-25 | — | 88.9% |
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