Data points: 108
Model compare
Gemini 2.5 Flash vs GPT-5
The readout for Gemini 2.5 Flash and GPT-5, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5
GPT-5 has the higher weighted result; Model A / B score 12 to 88.
Evidence depth
108 data points
Includes 21 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5
The charts below split 31 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 2.5 Flash and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 2.5 Flash | GPT-5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 12.0 pts | 88.0 pts |
| Benchmark category leads | 0 categories | 6 categories |
| Operational advantages | Cheapest input price, Average speed, Provider coverage | First-token latency, Free providers |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 65.5K tokens | 128K tokens |
| Modalities | Input FileImageTextAudiovideo 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 2.5 Flash | GPT-5 |
|---|---|---|
| Developer | OpenAI | |
| Released | Jun 2025 | Aug 2025 |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | 2025-01-31 | 2024-09-30 |
| OpenRouter ID | google/gemini-2.5-flash | openai/gpt-5 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for Gemini 2.5 Flash and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 2.5 Flash
Gemini 2.5 Flash has these operational advantages: Cheapest input price, Average speed, Provider coverage.
GPT-5
GPT-5 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Free providers).
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
- 6 / 8
- Model B coverage
- 7 / 8
- Shared
- 6 shared categories
Avg. score
Gemini 2.5 Flash
43.8
Avg. score
GPT-5
50.9
Agents
GPT-5 leads by 9.9
Coding
GPT-5 leads by 5.0
Reasoning
GPT-5 leads by 2.1
Knowledge
GPT-5 leads by 8.5
Math
GPT-5 leads by 10.8
Multilingual
No data
Multimodal
GPT-5
Instruction following
GPT-5 leads by 9.6
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 2.5 Flash
45.0
Rank #95/112 · confidence 1 · eval date 2025-06-17
GPT-5
winner67.0
Rank #27/112 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
winner$0.300/M
Rank #55/186 · confidence 4
GPT-5
$1.25/M
Rank #123/186 · confidence 4
Gemini 2.5 Flash
winner$0.850/M
Rank #82/186 · confidence 4
GPT-5
$3.44/M
Rank #139/186 · confidence 4
Gemini 2.5 Flash
winner$2.50/M
Rank #89/186 · confidence 4
GPT-5
$10.00/M
Rank #142/186 · confidence 4
Gemini 2.5 Flash
83.2%
Rank #42/129 · confidence 4
GPT-5
winner87.1%
Rank #12/129 · confidence 4
Gemini 2.5 Flash
48.0
Rank #89/106 · confidence 1 · eval date 2025-06-17
GPT-5
winner76.0
Rank #46/106 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
winner79.0%
Rank #100/218 · confidence 4
GPT-5
67.3%
Rank #148/218 · confidence 4
Gemini 2.5 Flash
winner12.1%
Rank #113/216 · confidence 4
GPT-5
6.0%
Rank #158/216 · confidence 4
Gemini 2.5 Flash
winner69.5%
Rank #30/115 · confidence 4
GPT-5
55.8%
Rank #49/115 · confidence 4
Gemini 2.5 Flash
29.1
Rank #104/113 · confidence 1 · eval date 2025-06-17
GPT-5
winner41.1
Rank #66/113 · confidence 2 · eval date 2025-08-07
Gemini 2.5 Flash
winner98.1%
Rank #7/73 · confidence 4
GPT-5
86.1%
Rank #42/73 · confidence 4
Gemini 2.5 Flash
winner82.3%
Rank #11/68 · confidence 4
GPT-5
36.7%
Rank #35/68 · confidence 4
Gemini 2.5 Flash
winner93.0
Rank #6/106 · confidence 1 · eval date 2025-06-17
GPT-5
83.2
Rank #32/106 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
26.1
Rank #67/106 · confidence 1 · eval date 2025-06-17
GPT-5
winner39.5
Rank #38/106 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
4.7
Rank #98/114 · confidence 1 · eval date 2025-06-17
GPT-5
winner25.4
Rank #60/114 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
68.3
Rank #92/113 · confidence 1 · eval date 2025-06-17
GPT-5
winner84.2
Rank #64/113 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
14.2
Rank #102/117 · confidence 1 · eval date 2025-06-17
GPT-5
winner22.9
Rank #76/117 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
65.5
Rank #52/68 · confidence 1 · eval date 2025-06-17
GPT-5
winner74.3
Rank #38/68 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
1127.0
Rank #67/78 · confidence 1 · eval date 2025-06-17
GPT-5
winner1197.0
Rank #52/78 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
39.0
Rank #72/84 · confidence 1 · eval date 2025-06-17
GPT-5
winner70.6
Rank #32/84 · confidence 1 · eval date 2025-08-07
Gemini 2.5 Flash
14.9
Rank #82/82 · confidence 1 · eval date 2025-06-17
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 2.5 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 2.5 Flash | GPT-5 |
|---|---|---|
SWT-API25 tests | Gemini 2.5 Flash speed / latency 139 tok/s / 4002ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
V-API20 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data |
CatClaw API15 tests | Gemini 2.5 Flash speed / latency 54 tok/s / 10365ms input / output No data | GPT-5 speed / latency 45 tok/s / 3704ms input / output No data |
N1N10 tests | Gemini 2.5 Flash speed / latency 200 tok/s / 8207ms input / output No data | GPT-5 speed / latency 102 tok/s / 948ms input / output No data |
OpenRouter10 tests | Gemini 2.5 Flash speed / latency 141 tok/s / 2052ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
Gemini 2.5 Flash gemini-2.5-flash 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 2.5 Flash gemini-2.5-flash-preview-05-20 speed / latency No data input / output $0/request | GPT-5 gpt-5 speed / latency No data input / output $0/request | |
Gemini 2.5 Flash gemini-2.5-flash speed / latency No data input / output $0.100/request | GPT-5 gpt-5 speed / latency No data input / output $0/M/$0/M | |
Gemini 2.5 Flash gemini-2.5-flash-nothinking speed / latency No data input / output $0.021/M/$0.171/M | GPT-5 gpt-5 speed / latency No data input / output $0.0014/request | |
Gemini 2.5 Flash gemini-2.5-flash-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: GPT-5. 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.