Gemini 2.5 Flash vs GPT-5 Pro
Direct spec comparison of Gemini 2.5 Flash (from Google) and GPT-5 Pro (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Gemini 2.5 Flash |  GPT-5 ProOpenAI | |
|---|---|---|
| Vendor | OpenAI | |
| Family | Gemini | GPT |
| Release date | 2025-06-17 | 2025-08-07 |
| Context window | 1,000,000 tokens | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio | text, vision, audio |
| 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. | Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth. |
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