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 GPT-5 ProOpenAI | o3 OpenAI |  Gemini 3 Pro | Gemini 3.5 Flash | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | ||
| Family | GPT | o-series | Gemini | Gemini |
| Release date | 2025-08-07 | 2025-04-16 | 2026-04-22 | 2026-05-20 |
| Context window | 400,000 tokens | 200,000 tokens | 2,000,000 tokens | — |
| Parameters | — | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision, audio, video | 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. | Reasoning-focused model in the o-series. | Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers. | 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. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | 87.1% | — |
| GPQA-D | — | 87.7% | 88.6% | — |
| HumanEval | — | — | 96.5% | — |
| Aider | — | — | 84.8% | — |
| AIME-25 | — | 88.9% | 92.8% | — |
| LiveCB | — | — | 76.1% | — |
| MMMU | — | — | 84.3% | — |
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Mistral Large 2maxMax 4 models. Remove one to add another.