Model comparison
Gemini 3 Pro vs o3
Head-to-head evidence from 14 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 3 Pro #19 (Supported); o3 #131 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 3 Pro and o3 share 14 comparable benchmark results. 1 of 8 categories are comparable. 13 results are unique to Gemini 3 Pro; 2 to o3.
Updated July 22, 2026- Shared results
- 14
- Gemini 3 Pro only
- 13
- o3 only
- 2
- Comparable categories
- 1 / 8
Pick Gemini 3 Pro if you want the stronger benchmark profile. o3 only becomes the better choice if you want the cheaper token bill or you want the stronger reasoning-first profile.
Confidence note. This is a partial-evidence comparison with 14 shared benchmark results across 7 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Gemini 3 Pro is clearly ahead on the BenchAlign aggregate, 67.73 to 47.89. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Pro's sharpest advantage is in mathematics, where it averages 32.9 against 14.5. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 37.600% to 18.685%.
Gemini 3 Pro is also the more expensive model on tokens at $2.00 input / $12.00 output per 1M tokens, versus $2.00 input / $8.00 output per 1M tokens for o3. o3 is the reasoning model in the pair, while Gemini 3 Pro is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemini 3 Pro gives you the larger context window at 2M, compared with 200K for o3.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Gemini 3 Pro | Δ | o3 |
|---|---|---|---|
| Math | Gemini 3 Pro32.9 | Margin← 18.4 | o314.5 |
| Reasoning | Gemini 3 Pro31.1 | MarginNo overlap | o3Not measured |
| Multimodal | Gemini 3 Pro81.1 | MarginNo overlap | o3Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 37.600%B 18.685%Winner: Gemini 3 ProΔ 18.9FrontierMath v2 (Tiers 1-3): Gemini 3 Pro scored 37.600%; o3 scored 18.685%. Gemini 3 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tier 4)
MathA 18.750%B 2.083%Winner: Gemini 3 ProΔ 16.7FrontierMath v2 (Tier 4): Gemini 3 Pro scored 18.750%; o3 scored 2.083%. Gemini 3 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 3 Pro | o3 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 3 Pro$2 input / $12 output | o3$2 input / $8 output | o3 has the lower combined listed price. |
| Generation speedtokens per second | Gemini 3 Pro109 tok/s | o3118 tok/s | o3 has the higher measured throughput. |
| First-answer latencyseconds to first token | Gemini 3 Pro32.65 s | o35.38 s | o3 reaches the first token sooner. |
| Context windowmaximum listed tokens | Gemini 3 Pro2M | o3200K | Gemini 3 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic3 benchmarks
Coding3 benchmarks
Reasoning3 benchmarks
Knowledge7 benchmarks
| Benchmark | Gemini 3 Pro | o3 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 39.5% | 30.4% | Gemini 3 Pro leads |
| AA-GPQA DiamondSource | 90.8% | 82.7% | Gemini 3 Pro leads |
| AA-HLESource | 37.2% | 20.0% | Gemini 3 Pro leads |
| AA-Omniscience IndexSource | 15.8% | -15.3% | Gemini 3 Pro leads |
| AA-Omniscience AccuracySource | 55.9% | 38.4% | Gemini 3 Pro leads |
| AA-Omniscience Hallucination RateSource | 90.9% | 87.1% | o3 leads |
| AA MMLU-ProSource | 89.8% | — | Not comparable |
MathGemini 3 Pro wins3 benchmarks
Multilingual1 benchmarks
| Benchmark | Gemini 3 Pro | o3 | Result |
|---|---|---|---|
| AA Global-MMLU-LiteSource | 92.2% | — | Not comparable |
Multimodal8 benchmarks
| Benchmark | Gemini 3 Pro | o3 | Result |
|---|---|---|---|
| MMMU-ProSource | 81% | — | Not comparable |
| MathVisionSource | 86.6% | — | Not comparable |
| VideoMMMUSource | 87.6% | — | Not comparable |
| ScreenSpot ProSource | 72.7% | — | Not comparable |
| CharXivSource | 81.4% | — | Not comparable |
| V*Source | 88.0% | — | Not comparable |
| AA-MMMU-ProSource | 80.2% | 70.1% | Gemini 3 Pro leads |
| Design Arena WebsiteSource | — | 1067 | Not comparable |
Inst. Following1 benchmarks
| Benchmark | Gemini 3 Pro | o3 | Result |
|---|---|---|---|
| AA-IFBenchSource | 70.4% | 71.4% | o3 leads |
Frequently Asked Questions (2)
Which is better, Gemini 3 Pro or o3?
Gemini 3 Pro is ahead on BenchLM's BenchAlign leaderboard, 67.73 to 47.89. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 37.600% and 18.685%.
Which is better for math, Gemini 3 Pro or o3?
Gemini 3 Pro has the edge for math in this comparison, averaging 32.9 versus 14.5. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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