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 GPT-5 ProOpenAI |  Gemini 3.5 Flash | o3 OpenAI | GPT-5 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | OpenAI | |
| Family | GPT | Gemini | o-series | GPT |
| Release date | 2025-08-07 | 2026-05-20 | 2025-04-16 | 2025-08-07 |
| Context window | 400,000 tokens | — | 200,000 tokens | 400,000 tokens |
| Parameters | — | — | — | — |
| Modality | text, vision, audio | text, vision, audio | text, vision | text, vision, audio |
| License | proprietary | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary | proprietary |
| Description | 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. | Fast, low-cost tier of the Gemini 3.5 family announced at Google I/O 2026. June 2026 update added native computer-use capability, moving Flash from generation to agentic task execution. | Reasoning-focused model in the o-series. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | — | 85.1% |
| GPQA-D | — | — | 87.7% | 87.3% |
| HumanEval | — | — | — | 95.2% |
| Aider | — | — | — | 85.4% |
| AIME-25 | — | — | 88.9% | 91.0% |
| LiveCB | — | — | — | 74.5% |
| MMMU | — | — | — | 74.1% |
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Mistral Large 2maxMax 4 models. Remove one to add another.