Data points: 116
Model compare
The readout for Gemini 3 Flash and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 27.3 to 72.7.
Evidence depth
116 data points
Includes 26 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 32 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 Flash and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 3 Flash | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 27.3 pts | 72.7 pts |
| Benchmark category leads | 1 categories | 5 categories |
| Operational advantages | Average speed, Free providers, Provider coverage | First-token latency |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 65.5K tokens | 128K tokens |
| Modalities | Input TextImageFileAudiovideo |
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 Flash | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | |
| Released | Dec 2025 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | google/gemini-3-flash-preview | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for Gemini 3 Flash and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 3 Flash
Gemini 3 Flash is stronger in benchmark categories (Coding) and operational dimensions (Average speed, Free providers, Provider coverage).
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Agents, Reasoning, Knowledge, Math, Instruction following) and operational dimensions (First-token latency).
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 Flash
50.1
Avg. score
GPT-5.1
52
GPT-5.1 leads by 5.1
Gemini 3 Flash leads by 4.8
GPT-5.1 leads by 0.3
GPT-5.1 leads by 2.4
GPT-5.1 leads by 2.1
No data
No data
GPT-5.1 leads by 5.9
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Gemini 3 Flash
winner57.0
Rank #38/84 · confidence 1 · eval date 2025-12-01
GPT-5.1
56.0
Rank #41/84 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner$0.500/M
Rank #69/162 · confidence 4
GPT-5.1
$1.25/M
Rank #107/162 · confidence 4
Gemini 3 Flash
winner$1.13/M
Rank #81/162 · confidence 4
GPT-5.1
$3.44/M
Rank #117/162 · confidence 4
Gemini 3 Flash
winner$3.00/M
Rank #85/162 · confidence 4
GPT-5.1
$10.00/M
Rank #120/162 · confidence 4
Gemini 3 Flash
48.0
Rank #68/89 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner88.2%
Rank #7/125 · confidence 4
GPT-5.1
87.0%
Rank #12/125 · confidence 4
Gemini 3 Flash
81.2%
Rank #72/188 · confidence 4
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
Gemini 3 Flash
1.4
Rank #50/73 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
14.1%
Rank #76/187 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
Gemini 3 Flash
79.7%
Rank #19/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
Gemini 3 Flash
winner49.9%
Rank #18/185 · confidence 4
GPT-5.1
43.3%
Rank #42/185 · confidence 4
Gemini 3 Flash
20.2
Rank #21/33 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner49.9
Rank #23/96 · confidence 1 · eval date 2025-12-01
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
4.2
Rank #23/35 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner35.6
Rank #16/47 · confidence 1 · eval date 2025-12-01
GPT-5.1
31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner50.5
Rank #29/56 · confidence 1 · eval date 2025-12-01
GPT-5.1
49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner90.2
Rank #11/90 · confidence 1 · eval date 2025-12-01
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner45.5
Rank #14/90 · confidence 1 · eval date 2025-12-01
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
81.2
Rank #59/96 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
14.1
Rank #62/96 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
27.4
Rank #62/99 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner78.6
Rank #12/57 · confidence 1 · eval date 2025-12-01
GPT-5.1
75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner1221.0
Rank #34/66 · confidence 1 · eval date 2025-12-01
GPT-5.1
1212.0
Rank #38/66 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
55.1
Rank #56/86 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
winner56.6
Rank #16/50 · confidence 1 · eval date 2025-12-01
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
Gemini 3 Flash
43.3
Rank #70/84 · confidence 1 · eval date 2025-12-01
GPT-5.1
winner81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 3 Flash | GPT-5.1 |
|---|---|---|
| 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 Flash | GPT-5.1 |
|---|---|---|
30 tests | Gemini 3 Flash speed / latency 129 tok/s / 10293ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
25 tests | Gemini 3 Flash speed / latency 157 tok/s / 7994ms input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
10 tests | Gemini 3 Flash speed / latency 118 tok/s / 9594ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | Gemini 3 Flash speed / latency 160 tok/s / 6933ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | Gemini 3 Flash speed / latency 155 tok/s / 6071ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
Gemini 3 Flash gemini-3-flash-preview-all speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-all speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
Input ImageTextFile Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
