Model comparison
Gemini 2.5 Flash vs Gemini 2.5 Pro
Head-to-head evidence from 15 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 2.5 Flash #130 (Supported); Gemini 2.5 Pro #70 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 2.5 Flash and Gemini 2.5 Pro share 15 comparable benchmark results. 1 of 8 categories are comparable. 0 results are unique to Gemini 2.5 Flash; 9 to Gemini 2.5 Pro.
Updated July 22, 2026- Shared results
- 15
- Gemini 2.5 Flash only
- 0
- Gemini 2.5 Pro only
- 9
- Comparable categories
- 1 / 8
Pick Gemini 2.5 Pro if you want the stronger benchmark profile. Gemini 2.5 Flash only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 15 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 2.5 Pro is clearly ahead on the BenchAlign aggregate, 57.25 to 48.09. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 2.5 Pro's sharpest advantage is in mathematics, where it averages 11.6 against 4.7. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 4.844% to 14.138%.
Gemini 2.5 Pro is also the more expensive model on tokens at $1.25 input / $10.00 output per 1M tokens, versus $0.30 input / $2.50 output per 1M tokens for Gemini 2.5 Flash. That is roughly 4.0x 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 Flash | Δ | Gemini 2.5 Pro |
|---|---|---|---|
| Math | Gemini 2.5 Flash4.7 | Margin→ 6.9 | Gemini 2.5 Pro11.6 |
| Coding | Gemini 2.5 FlashNot measured | MarginNo overlap | Gemini 2.5 Pro63.8 |
| Knowledge | Gemini 2.5 FlashNot measured | MarginNo overlap | Gemini 2.5 Pro27.4 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 4.844%B 14.138%Winner: Gemini 2.5 ProΔ 9.3FrontierMath v2 (Tiers 1-3): Gemini 2.5 Flash scored 4.844%; Gemini 2.5 Pro scored 14.138%. Gemini 2.5 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 2.5 Flash | Gemini 2.5 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 2.5 Flash$0.3 input / $2.5 output | Gemini 2.5 Pro$1.25 input / $10 output | Gemini 2.5 Flash has the lower combined listed price. |
| Generation speedtokens per second | Gemini 2.5 Flash221 tok/s | Gemini 2.5 Pro117 tok/s | Gemini 2.5 Flash has the higher measured throughput. |
| First-answer latencyseconds to first token | Gemini 2.5 Flash0.50 s | Gemini 2.5 Pro21.19 s | Gemini 2.5 Flash reaches the first token sooner. |
| Context windowmaximum listed tokens | Gemini 2.5 Flash1M | Gemini 2.5 Pro1M | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | Gemini 2.5 Flash | Gemini 2.5 Pro | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 14.1% | 25.8% | Gemini 2.5 Pro leads |
| AA-GPQA DiamondSource | 68.3% | 84.4% | Gemini 2.5 Pro leads |
| AA-HLESource | 5.1% | 21.1% | Gemini 2.5 Pro leads |
| AA-Omniscience IndexSource | -42.0% | -14.3% | Gemini 2.5 Pro leads |
| AA-Omniscience AccuracySource | 26.5% | 39.0% | Gemini 2.5 Pro leads |
| AA-Omniscience Hallucination RateSource | 93.3% | 87.4% | Gemini 2.5 Pro leads |
| GPQASource | — | 83% | Not comparable |
| HLESource | — | 18.8% | Not comparable |
MathGemini 2.5 Pro wins2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemini 2.5 Flash | Gemini 2.5 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 39.0% | 48.7% | Gemini 2.5 Pro leads |
Frequently Asked Questions (2)
Which is better, Gemini 2.5 Flash or Gemini 2.5 Pro?
Gemini 2.5 Pro is ahead on BenchLM's BenchAlign leaderboard, 57.25 to 48.09. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 4.844% and 14.138%.
Which is better for math, Gemini 2.5 Flash or Gemini 2.5 Pro?
Gemini 2.5 Pro has the edge for math in this comparison, averaging 11.6 versus 4.7. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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