Data points: 71
The readout for Gemini 1.5 Flash and Gemini 2.5 Pro, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
71 data points
Includes 7 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Tie
The charts below split 14 high-signal samples across speed, scores, and audit health.
Model compare Gemini 1.5 Flash vs Gemini 2.5 Progemini-1-5-flash-vs-gemini-2-5-pro | Model A Gemini 1.5 Flash | Model B Gemini 2.5 Pro |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | Cheapest input price, Average speed, First-token latency | Free providers, Provider coverage, Recent tests |
| Model metadata | No OpenRouter metadata is available yet for this model. | Gemini 2.5 Pro exposes 1.0M tokens; notable signals: Text input, Image input, File input, Audio input. |
| Developer | ||
| Context window | No data | 1.0M tokens |
| Max output | No data | 65.5K tokens |
| Released | No data | Jun 2025 |
| Modalities | No data | Input TextImageFileAudiovideo Output Text |
| Features | None listed | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | No data | Gemini |
| Knowledge cutoff | No data | 2025-01-31 |
| OpenRouter ID | No data | google/gemini-2.5-pro |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Gemini 1.5 Flash | Gemini 2.5 Pro |
|---|---|---|
| AIME | 18.0%#40 | 88.7%#6 |
| MMLU-Pro | 68.0%#70 | 86.2%#12 |
| MATH-500 | 82.7%#40 | 96.7%#16 |
| LiveCodeBench | 27.3%#82 | 80.1%#18 |
| SciCode | 26.7%#97 | 42.8%#32 |
| GPQA | 46.3%#124 | 84.4%#36 |
| HLE | 3.5%#100 | 21.1%#37 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 1.5 Flash | Gemini 2.5 Pro |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini 1.5 Flash | Gemini 2.5 Pro |
|---|---|---|
V-API15 tests | Gemini 1.5 Flash speed / latency 163 tok/s / 1183ms input / output No data | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data |
AIGCBAR0 tests | Gemini 1.5 Flash speed / latency N/A / N/A input / output No data | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data |
AIO通用智能服务平台0 tests | Gemini 1.5 Flash speed / latency N/A / N/A input / output No data | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data |
Aitoke0 tests | Gemini 1.5 Flash speed / latency N/A / N/A input / output No data | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data |
CHB API0 tests | Gemini 1.5 Flash gemini-1.5-flash-latest speed / latency N/A / N/A input / output $0.0033/M / $0.013/M | Gemini 2.5 Pro gemini-2.5-pro speed / latency N/A / N/A input / output $0.034/M / $0.274/M |
Gemini 1.5 Flash gemini-1.5-flash-8b speed / latency No data input / output $0.040/M / $0.160/M | Gemini 2.5 Pro gemini-2.5-pro-preview-06-05-nothinking speed / latency No data input / output $1.25/M / $10.00/M | |
Gemini 1.5 Flash gemini-1.5-flash-8b speed / latency No data input / output $0.075/M / $0.300/M | Gemini 2.5 Pro google/gemini-2.5-pro-preview-05-06 speed / latency No data input / output $75.00/M / $75.00/M |
This report only uses LMSpeed data for Gemini 1.5 Flash and Gemini 2.5 Pro: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 1.5 Flash | Gemini 2.5 Pro |
|---|---|---|
| When to choose each model | Gemini 1.5 Flash Gemini 1.5 Flash is stronger when you prioritize Cheapest input price, Average speed, First-token latency. | Gemini 2.5 Pro Gemini 2.5 Pro is stronger when you prioritize Free providers, Provider coverage, Recent tests. |
TL;DR: Tie leads across 71 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 1.5 Flash vs Gemini 2.5 Pro into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
