Data points: 115
Model compare
Gemini 3 Flash vs GPT-5
The readout for Gemini 3 Flash and GPT-5, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: Gemini 3 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Gemini 3 Flash
Gemini 3 Flash has the higher weighted result; Model A / B score 61.7 to 38.3.
Evidence depth
115 data points
Includes 25 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with Gemini 3 Flash
The charts below split 35 high-signal samples across speed, scores, and audit health.
Change comparison
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.
Comparison sheet
This report only uses LMSpeed data for Gemini 3 Flash and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 3 Flash | GPT-5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 61.7 pts | 38.3 pts |
| Benchmark category leads | 4 categories | 3 categories |
| Operational advantages | Cheapest input price, 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 Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
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 metadata
Model metadata
| Model compare | Gemini 3 Flash | GPT-5 |
|---|---|---|
| Developer | OpenAI | |
| Released | Dec 2025 | Aug 2025 |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | No data | 2024-09-30 |
| OpenRouter ID | google/gemini-3-flash-preview | openai/gpt-5 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for Gemini 3 Flash and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 3 Flash
Gemini 3 Flash is stronger in benchmark categories (Coding, Reasoning, Knowledge, Multimodal) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).
GPT-5
GPT-5 is stronger in benchmark categories (Agents, Math, Instruction following) and operational dimensions (First-token latency).
Benchmark score comparison
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Category performance
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
- Model A coverage
- 8 / 8
- Model B coverage
- 7 / 8
- Shared
- 7 shared categories
Avg. score
Gemini 3 Flash
51.3
Avg. score
GPT-5
50.9
Agents
GPT-5 leads by 2.7
Coding
Gemini 3 Flash leads by 4.1
Reasoning
Gemini 3 Flash leads by 1.3
Knowledge
Gemini 3 Flash leads by 4.5
Math
GPT-5 leads by 9.9
Multilingual
Gemini 3 Flash
Multimodal
Gemini 3 Flash leads by 3.0
Instruction following
GPT-5 leads by 4.9
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Gemini 3 Flash
65.0
Rank #38/112 · confidence 3 · eval date 2025-12-01
GPT-5
winner67.0
Rank #27/112 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner$0.500/M
Rank #85/186 · confidence 4
GPT-5
$1.25/M
Rank #123/186 · confidence 4
Gemini 3 Flash
winner$1.13/M
Rank #97/186 · confidence 4
GPT-5
$3.44/M
Rank #139/186 · confidence 4
Gemini 3 Flash
winner$3.00/M
Rank #99/186 · confidence 4
GPT-5
$10.00/M
Rank #142/186 · confidence 4
Gemini 3 Flash
winner88.2%
Rank #7/129 · confidence 4
GPT-5
87.1%
Rank #12/129 · confidence 4
Gemini 3 Flash
59.0
Rank #50/67 · confidence 3 · eval date 2025-12-01
GPT-5
winner73.2
Rank #31/67 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
55.3
Rank #83/106 · confidence 3 · eval date 2025-12-01
GPT-5
winner76.0
Rank #46/106 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner81.2%
Rank #95/218 · confidence 4
GPT-5
67.3%
Rank #148/218 · confidence 4
Gemini 3 Flash
winner15.0%
Rank #102/216 · confidence 4
GPT-5
6.0%
Rank #158/216 · confidence 4
Gemini 3 Flash
winner79.7%
Rank #19/115 · confidence 4
GPT-5
55.8%
Rank #49/115 · confidence 4
Gemini 3 Flash
winner20.2
Rank #21/33 · confidence 3 · eval date 2025-12-01
GPT-5
20.1
Rank #22/33 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner49.9
Rank #36/113 · confidence 1 · eval date 2025-12-01
GPT-5
41.1
Rank #66/113 · confidence 2 · eval date 2025-08-07
Gemini 3 Flash
winner92.4
Rank #11/106 · confidence 3 · eval date 2025-12-01
GPT-5
83.2
Rank #32/106 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner45.8
Rank #23/106 · confidence 3 · eval date 2025-12-01
GPT-5
39.5
Rank #38/106 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner76.6
Rank #25/83 · confidence 3 · eval date 2025-12-01
GPT-5
65.4
Rank #51/83 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
15.0
Rank #79/114 · confidence 3 · eval date 2025-12-01
GPT-5
winner25.4
Rank #60/114 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
81.2
Rank #75/113 · confidence 3 · eval date 2025-12-01
GPT-5
winner84.2
Rank #64/113 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
17.9
Rank #92/117 · confidence 3 · eval date 2025-12-01
GPT-5
winner22.9
Rank #76/117 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner78.6
Rank #19/68 · confidence 3 · eval date 2025-12-01
GPT-5
74.3
Rank #38/68 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner75.8
Rank #19/56 · confidence 3 · eval date 2025-12-01
GPT-5
69.4
Rank #27/56 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner1210.0
Rank #46/78 · confidence 3 · eval date 2025-12-01
GPT-5
1197.0
Rank #52/78 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
66.2
Rank #46/52 · confidence 3 · eval date 2025-12-01
GPT-5
winner86.3
Rank #27/52 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
55.1
Rank #53/84 · confidence 3 · eval date 2025-12-01
GPT-5
winner70.6
Rank #32/84 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
winner11.4
Rank #21/24 · confidence 3 · eval date 2025-12-01
GPT-5
8.5
Rank #24/24 · confidence 1 · eval date 2025-08-07
Gemini 3 Flash
43.3
Rank #69/82 · confidence 3 · eval date 2025-12-01
GPT-5
winner86.5
Rank #39/82 · confidence 1 · eval date 2025-08-07
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 3 Flash | GPT-5 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini 3 Flash | GPT-5 |
|---|---|---|
CatClaw API35 tests | Gemini 3 Flash speed / latency 129 tok/s / 10293ms input / output No data | GPT-5 speed / latency 45 tok/s / 3704ms input / output No data |
N1N25 tests | Gemini 3 Flash speed / latency 157 tok/s / 7994ms input / output No data | GPT-5 speed / latency 102 tok/s / 948ms input / output No data |
V-API20 tests | Gemini 3 Flash speed / latency N/A / N/A input / output No data | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data |
Hi API10 tests | Gemini 3 Flash speed / latency 118 tok/s / 9594ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
Rnglg2 API10 tests | Gemini 3 Flash speed / latency 160 tok/s / 6933ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
Gemini 3 Flash gemini-3-flash-preview speed / latency No data input / output $0/M/$0/M | GPT-5 gpt-5 speed / latency No data input / output $0/M/$0/M | |
Gemini 3 Flash gemini-3-flash-preview-nothinking speed / latency No data input / output $0/request | GPT-5 gpt-5 speed / latency No data input / output $0/request | |
Gemini 3 Flash gemini-3-flash-preview speed / latency No data input / output $0.100/request | GPT-5 gpt-5 speed / latency No data input / output $0/M/$0/M | |
Gemini 3 Flash gemini-3-flash speed / latency No data input / output $0.034/M/$0.205/M | GPT-5 gpt-5 speed / latency No data input / output $0.0014/request | |
Gemini 3 Flash gemini-3-flash-preview-c speed / latency No data input / output $0.0027/request | GPT-5 gpt-5 speed / latency No data input / output $0.137/M/$1.10/M |
FAQ
Weighted outcome: Gemini 3 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
- Why is this comparison indexable?
- It has 6 verifiable comparison points, and both models have pricing or benchmark data.
- Are missing metrics invented?
- No. Metrics without LMSpeed data are omitted from this report.