Data points: 145
Model compare
The readout for Gemini 3.1 Pro and Gemini 3.5 Flash, before the detailed comparison sheet.
Weighted outcome: Gemini 3.1 Pro. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Gemini 3.1 Pro
Gemini 3.1 Pro has the higher weighted result; Model A / B score 70.5 to 29.5.
Evidence depth
145 data points
Includes 41 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with Gemini 3.1 Pro
The charts below split 49 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for Gemini 3.1 Pro and Gemini 3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 3.1 Pro | Gemini 3.5 Flash |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 70.5 pts | 29.5 pts |
| Benchmark category leads | 5 categories | 2 categories |
| Operational advantages | Free providers, Provider coverage | Cheapest input price |
| Context window | 1.0M tokens | 1.0M tokens |
| Max output | 65.5K tokens | 65.5K tokens |
| Modalities | Input AudioFileImageTextvideo Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | Gemini 3.1 Pro | Gemini 3.5 Flash |
|---|---|---|
| Developer | ||
| Released | Feb 2026 | May 2026 |
| Parameters | No data | No data |
| Tokenizer | Gemini | Gemini |
| Knowledge cutoff | No data | 2025-01-01 |
| OpenRouter ID | google/gemini-3.1-pro-preview | google/gemini-3.5-flash |
| References | No data | No data |
This report only uses LMSpeed data for Gemini 3.1 Pro and Gemini 3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 3.1 Pro
Gemini 3.1 Pro is stronger in benchmark categories (Coding, Reasoning, Knowledge, Math, Instruction following) and operational dimensions (Free providers, Provider coverage).
Gemini 3.5 Flash
Gemini 3.5 Flash is stronger in benchmark categories (Agents, Multimodal) and operational dimensions (Cheapest input price).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
Gemini 3.1 Pro
56
Avg. score
Gemini 3.5 Flash
56.3
Gemini 3.5 Flash leads by 11.6
Gemini 3.1 Pro leads by 1.3
Gemini 3.1 Pro leads by 5.2
Gemini 3.1 Pro leads by 1.7
Gemini 3.1 Pro leads by 0.2
Gemini 3.1 Pro
Gemini 3.5 Flash leads by 2.5
Gemini 3.1 Pro leads by 0.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Gemini 3.1 Pro
winner74.0
Rank #9/83 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
71.0
Rank #16/83 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner77.1
Rank #3/9 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
72.1
Rank #5/9 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner87.6
Rank #4/19 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
76.0
Rank #14/19 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner17.7
Rank #11/73 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
13.1
Rank #16/73 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner72.7
Rank #12/89 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
69.3
Rank #22/89 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner58.9
Rank #2/96 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
53.1
Rank #15/96 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner53.8
Rank #6/15 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
40.9
Rank #13/15 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
73.8
Rank #12/15 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner78.7
Rank #9/15 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
32.0
Rank #13/33 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner48.7
Rank #9/33 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
68.8
Rank #12/58 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner70.1
Rank #11/58 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner66.4
Rank #12/64 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
58.5
Rank #28/64 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
36.9
Rank #15/47 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner39.0
Rank #12/47 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner16.7
Rank #13/35 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
14.6
Rank #14/35 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
55.2
Rank #28/56 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner56.0
Rank #27/56 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner94.1
Rank #1/96 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
92.2
Rank #9/96 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner32.9
Rank #2/29 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
22.7
Rank #6/29 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner94.3
Rank #2/23 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
92.7
Rank #8/23 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner44.7
Rank #4/96 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
41.0
Rank #8/96 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner55.3
Rank #5/90 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
51.9
Rank #7/90 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
46.5
Rank #13/99 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner50.2
Rank #12/99 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner72.8
Rank #24/54 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
66.2
Rank #32/54 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
49.9
Rank #68/90 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner60.7
Rank #62/90 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
82.4
Rank #3/57 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner84.3
Rank #1/57 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner83.9
Rank #2/26 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
83.6
Rank #3/26 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
80.9
Rank #5/34 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner84.0
Rank #4/34 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
80.2
Rank #13/21 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner84.2
Rank #5/21 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
1284.0
Rank #20/65 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner1287.0
Rank #18/65 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner77.1
Rank #10/86 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
76.3
Rank #13/86 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner85.8
Rank #12/26 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
82.7
Rank #18/26 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
32.0
Rank #6/21 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner47.1
Rank #1/21 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
42.2
Rank #8/15 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner50.1
Rank #2/15 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
37.5
Rank #10/12 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner42.6
Rank #6/12 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
30.3
Rank #13/14 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner40.3
Rank #7/14 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
13.3
Rank #18/19 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner18.0
Rank #8/19 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
56.9
Rank #14/50 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner61.9
Rank #10/50 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
16.5
Rank #14/15 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner25.4
Rank #11/15 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
21.4
Rank #35/54 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner37.5
Rank #12/54 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
66.5
Rank #18/52 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner77.7
Rank #12/52 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
23.2
Rank #37/50 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner42.4
Rank #13/50 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
965.0
Rank #37/54 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
winner1349.0
Rank #13/54 · confidence 4 · eval date 2026-05-19
Gemini 3.1 Pro
winner95.6
Rank #15/84 · confidence 3 · eval date 2026-02-19
Gemini 3.5 Flash
95.3
Rank #17/84 · confidence 4 · eval date 2026-05-19
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 3.1 Pro | Gemini 3.5 Flash |
|---|---|---|
| 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 3.1 Pro | Gemini 3.5 Flash |
|---|---|---|
5 tests | Gemini 3.1 Pro speed / latency 83 tok/s / 20273ms input / output No data | Gemini 3.5 Flash speed / latency N/A / N/A input / output No data |
5 tests | Gemini 3.1 Pro speed / latency 98 tok/s / 12325ms input / output No data | Gemini 3.5 Flash speed / latency N/A / N/A input / output No data |
5 tests | Gemini 3.1 Pro speed / latency 70 tok/s / 18615ms input / output No data | Gemini 3.5 Flash speed / latency N/A / N/A input / output No data |
0 tests | Gemini 3.1 Pro speed / latency N/A / N/A input / output No data | Gemini 3.5 Flash speed / latency N/A / N/A input / output No data |
0 tests | Gemini 3.1 Pro speed / latency N/A / N/A input / output No data | Gemini 3.5 Flash speed / latency N/A / N/A input / output No data |
Gemini 3.1 Pro gemini-3.1-pro-preview speed / latency No data input / output $0.192/M/$1.15/M | Gemini 3.5 Flash gemini-3.5-flash speed / latency No data input / output $0/M | |
Gemini 3.1 Pro gemini-3.1-pro-preview speed / latency No data input / output $0/M/$0/M | Gemini 3.5 Flash gemini-3.5-flash speed / latency No data input / output $75.00/M | |
Gemini 3.1 Pro gemini-3.1-pro-preview speed / latency No data input / output $0/request | Gemini 3.5 Flash gemini-3.5-flash speed / latency No data input / output $0/request |
Weighted outcome: Gemini 3.1 Pro. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input TextImagevideoFileAudio Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
