Model comparison
Gemini 3 Deep Think vs GPT-5.5 Pro
GPT-5.5 Pro has enough public results to be ranked (#8); Gemini 3 Deep Think does not yet, so treat this comparison as directional.
Last verified . 3 shared benchmarks.
GoogleSummary
- They share 3 benchmarks with published results for both. Gemini 3 Deep Think scores higher in 0 categories and GPT-5.5 Pro in 1 category; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 70.2.
Side by side
| Gemini 3 Deep Think | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 58.3 | 64.3 |
| Released | 2026-02-12 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 3 | 14 |
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Category by category
Reasoning GPT-5.5 Pro leads
Gemini 3 Deep Think: 70.2 (#14), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Gemini 3 Deep Think | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | 84.6% | 84.6% |
| ARC-AGI-1 | 96% | 96.5% |
| CritPt | 25.7% | 30.6% |
| SimpleBench | — | 76.9% |
| Chess Puzzles | — | 64% |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.07 |
Math Not comparable
Gemini 3 Deep Think: —, GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Gemini 3 Deep Think | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge Not comparable
Gemini 3 Deep Think: —, GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Gemini 3 Deep Think | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
Frequently asked questions
Is Gemini 3 Deep Think better than GPT-5.5 Pro?
GPT-5.5 Pro has enough public results to be ranked (#8); Gemini 3 Deep Think does not yet, so treat this comparison as directional.
How many benchmarks do Gemini 3 Deep Think and GPT-5.5 Pro share?
3 benchmarks have published results for both models. Gemini 3 Deep Think has 3 scored results on Noometry and GPT-5.5 Pro has 14.