Model comparison
Gemini 3 Flash vs GPT-5.4 Pro
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 3 Flash #49 (Supported); GPT-5.4 Pro #44 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 3 Flash and GPT-5.4 Pro share 3 comparable benchmark results. 1 of 8 categories are comparable. 16 results are unique to Gemini 3 Flash; 9 to GPT-5.4 Pro.
Updated July 23, 2026- Shared results
- 3
- Gemini 3 Flash only
- 16
- GPT-5.4 Pro only
- 9
- Comparable categories
- 1 / 8
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Gemini 3 Flash only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 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
GPT-5.4 Pro has the cleaner BenchAlign overall profile here, landing at 60.89 versus 60.49. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GPT-5.4 Pro's sharpest advantage is in mathematics, where it averages 46.9 against 27.8. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 4.167% to 37.500%.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.50 input / $3.00 output per 1M tokens for Gemini 3 Flash. That is roughly 60.0x on output cost alone. GPT-5.4 Pro is the reasoning model in the pair, while Gemini 3 Flash 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. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for Gemini 3 Flash.
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 Flash | Δ | GPT-5.4 Pro |
|---|---|---|---|
| Math | Gemini 3 Flash27.8 | Margin→ 19.1 | GPT-5.4 Pro46.9 |
| Agentic | Gemini 3 FlashNot measured | MarginNo overlap | GPT-5.4 Pro89.3 |
| Reasoning | Gemini 3 FlashNot measured | MarginNo overlap | GPT-5.4 Pro83.3 |
| Knowledge | Gemini 3 FlashNot measured | MarginNo overlap | GPT-5.4 Pro58.7 |
| Multimodal | Gemini 3 FlashNot measured | MarginNo overlap | GPT-5.4 Pro94.0 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tier 4)
MathA 4.167%B 37.500%Winner: GPT-5.4 ProΔ 33.3FrontierMath v2 (Tier 4): Gemini 3 Flash scored 4.167%; GPT-5.4 Pro scored 37.500%. GPT-5.4 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 35.640%B 50.000%Winner: GPT-5.4 ProΔ 14.4FrontierMath v2 (Tiers 1-3): Gemini 3 Flash scored 35.640%; GPT-5.4 Pro scored 50.000%. GPT-5.4 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 3 Flash | GPT-5.4 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 3 Flash$0.5 input / $3 output | GPT-5.4 Pro$30 input / $180 output | Gemini 3 Flash has the lower combined listed price. |
| Generation speedtokens per second | Gemini 3 Flash159 tok/s | GPT-5.4 Pro74 tok/s | Gemini 3 Flash has the higher measured throughput. |
| First-answer latencyseconds to first token | Gemini 3 Flash1.19 s | GPT-5.4 Pro151.79 s | Gemini 3 Flash reaches the first token sooner. |
| Context windowmaximum listed tokens | Gemini 3 Flash1M | GPT-5.4 Pro1.05M | GPT-5.4 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding2 benchmarks
Reasoning3 benchmarks
Knowledge10 benchmarks
| Benchmark | Gemini 3 Flash | GPT-5.4 Pro | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 27.4% | — | Not comparable |
| AA-GPQA DiamondSource | 81.2% | — | Not comparable |
| AA-HLESource | 14.1% | — | Not comparable |
| AA-Omniscience IndexSource | -3.6% | — | Not comparable |
| AA-Omniscience AccuracySource | 45.5% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 90.2% | — | Not comparable |
| HLESource | — | 58.7% | Not comparable |
| FrontierScienceSource | — | 36.7% | Not comparable |
| FrontierScience ResearchSource | — | 36.7% | Not comparable |
| HLE w/o toolsSource | — | 42.7% | Not comparable |
MathGPT-5.4 Pro wins4 benchmarks
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemini 3 Flash | GPT-5.4 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 55.1% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Gemini 3 Flash or GPT-5.4 Pro?
GPT-5.4 Pro is ahead on BenchLM's BenchAlign leaderboard, 60.89 to 60.49. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 4.167% and 37.500%.
Which is better for math, Gemini 3 Flash or GPT-5.4 Pro?
GPT-5.4 Pro has the edge for math in this comparison, averaging 46.9 versus 27.8. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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