Gemini 2.5 Flash vs o3
Google Gemini 2.5 Flash | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Apr 17 2025 | Apr 16 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 19% | 26%Best |
| Timeline | ||
| Release gap | o3 shipped 1 days before Gemini 2.5 Flash | |
Which is better: Gemini 2.5 Flash or o3?
o3 leads Gemini 2.5 Flash on 1 of the 1 benchmark they both report (BullshitBench v2). o3 shipped 1 days before Gemini 2.5 Flash, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, o3 leads at 26% vs Gemini 2.5 Flash at 19%.
Frequently asked questions
Gemini 2.5 Flash was released by Google on Apr 17 2025.
o3 was released by OpenAI on Apr 16 2025.
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