Model comparison
Gemini 2.5 Pro vs Gemini 3 Flash
Head-to-head evidence from 17 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 2.5 Pro #70 (Supported); Gemini 3 Flash #49 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 2.5 Pro and Gemini 3 Flash share 17 comparable benchmark results. 1 of 8 categories are comparable. 7 results are unique to Gemini 2.5 Pro; 2 to Gemini 3 Flash.
Updated July 22, 2026- Shared results
- 17
- Gemini 2.5 Pro only
- 7
- Gemini 3 Flash only
- 2
- Comparable categories
- 1 / 8
Pick Gemini 3 Flash if you want the stronger benchmark profile. Gemini 2.5 Pro only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Confidence note. This is a partial-evidence comparison with 17 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 Flash is clearly ahead on the BenchAlign aggregate, 60.49 to 57.25. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Flash's sharpest advantage is in mathematics, where it averages 27.8 against 11.6. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 14.138% to 35.640%.
Gemini 2.5 Pro is also the more expensive model on tokens at $1.25 input / $10.00 output per 1M tokens, versus $0.50 input / $3.00 output per 1M tokens for Gemini 3 Flash. That is roughly 3.3x on output cost alone.
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 2.5 Pro | Δ | Gemini 3 Flash |
|---|---|---|---|
| Math | Gemini 2.5 Pro11.6 | Margin→ 16.2 | Gemini 3 Flash27.8 |
| Coding | Gemini 2.5 Pro63.8 | MarginNo overlap | Gemini 3 FlashNot measured |
| Knowledge | Gemini 2.5 Pro27.4 | MarginNo overlap | Gemini 3 FlashNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 14.138%B 35.640%Winner: Gemini 3 FlashΔ 21.5FrontierMath v2 (Tiers 1-3): Gemini 2.5 Pro scored 14.138%; Gemini 3 Flash scored 35.640%. Gemini 3 Flash wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 2.5 Pro | Gemini 3 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 2.5 Pro$1.25 input / $10 output | Gemini 3 Flash$0.5 input / $3 output | Gemini 3 Flash has the lower combined listed price. |
| Generation speedtokens per second | Gemini 2.5 Pro117 tok/s | Gemini 3 Flash159 tok/s | Gemini 3 Flash has the higher measured throughput. |
| First-answer latencyseconds to first token | Gemini 2.5 Pro21.19 s | Gemini 3 Flash1.19 s | Gemini 3 Flash reaches the first token sooner. |
| Context windowmaximum listed tokens | Gemini 2.5 Pro1M | Gemini 3 Flash1M | Listed context windows are equal. |
Benchmark Deep Dive
Agentic7 benchmarks
| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Result |
|---|---|---|---|
| AA Agentic IndexSource | 7.1% | — | Not comparable |
| τ²-bench resultsSource | 54.1% | 43.3% | Gemini 2.5 Pro leads |
| Gert LabsSource | 42.01% | 56.63% | Gemini 3 Flash leads |
| GDPval-AASource | 8.3% | — | Not comparable |
| GDPval-AASource | 665 | — | Not comparable |
| Claw-EvalSource | — | 49.2% | Not comparable |
| JobBenchSource | — | 11.4% | Not comparable |
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Result |
|---|---|---|---|
| GPQASource | 83% | — | Not comparable |
| HLESource | 18.8% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 25.8% | 27.4% | Gemini 3 Flash leads |
| AA-GPQA DiamondSource | 84.4% | 81.2% | Gemini 2.5 Pro leads |
| AA-HLESource | 21.1% | 14.1% | Gemini 2.5 Pro leads |
| AA-Omniscience IndexSource | -14.3% | -3.6% | Gemini 3 Flash leads |
| AA-Omniscience AccuracySource | 39.0% | 45.5% | Gemini 3 Flash leads |
| AA-Omniscience Hallucination RateSource | 87.4% | 90.2% | Gemini 2.5 Pro leads |
MathGemini 3 Flash wins2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | 48.7% | 55.1% | Gemini 3 Flash leads |
Frequently Asked Questions (2)
Which is better, Gemini 2.5 Pro or Gemini 3 Flash?
Gemini 3 Flash is ahead on BenchLM's BenchAlign leaderboard, 60.49 to 57.25. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 14.138% and 35.640%.
Which is better for math, Gemini 2.5 Pro or Gemini 3 Flash?
Gemini 3 Flash has the edge for math in this comparison, averaging 27.8 versus 11.6. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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