Data points: 110
Model compare
GPT-5 vs O3
The readout for GPT-5 and O3, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: O3. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
O3
O3 has the higher weighted result; Model A / B score 38.7 to 61.3.
Evidence depth
110 data points
Includes 22 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with O3
The charts below split 32 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 GPT-5 and O3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5 | O3 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 38.7 pts | 61.3 pts |
| Benchmark category leads | 2 categories | 4 categories |
| Operational advantages | Cheapest input price, Free providers, Provider coverage | Average speed, First-token latency |
| Context window | 400K tokens | 200K tokens |
| Max output | 128K tokens | 100K tokens |
| Modalities | Input TextImageFile Output Text | Input ImageTextFile Output Text |
| Features | Text inputImage inputFile 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 | GPT-5 | O3 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Aug 2025 | Apr 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2024-09-30 | 2024-06-30 |
| OpenRouter ID | openai/gpt-5 | openai/o3 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5 and O3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5
GPT-5 is stronger in benchmark categories (Knowledge, Math) and operational dimensions (Cheapest input price, Free providers, Provider coverage).
O3
O3 is stronger in benchmark categories (Agents, Coding, Reasoning, Instruction following) and operational dimensions (Average speed, 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
- 7 / 8
- Model B coverage
- 6 / 8
- Shared
- 6 shared categories
Avg. score
GPT-5
50.9
Avg. score
O3
52.6
Agents
O3 leads by 3.4
Coding
O3 leads by 4.5
Reasoning
O3 leads by 2.9
Knowledge
GPT-5 leads by 1.6
Math
GPT-5 leads by 2.7
Multilingual
No data
Multimodal
GPT-5
Instruction following
O3 leads by 0.3
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.
GPT-5
winner67.0
Rank #27/111 · confidence 1 · eval date 2025-08-07
O3
50.0
Rank #82/111 · confidence 1 · eval date 2025-04-16
GPT-5
winner$1.25/M
Rank #123/186 · confidence 4
O3
$2.00/M
Rank #143/186 · confidence 4
GPT-5
$10.00/M
Rank #142/186 · confidence 4
O3
winner$8.00/M
Rank #138/186 · confidence 4
GPT-5
winner$3.44/M
Rank #139/186 · confidence 4
O3
$3.50/M
Rank #145/186 · confidence 4
GPT-5
winner87.1%
Rank #12/129 · confidence 4
O3
85.3%
Rank #27/129 · confidence 4
GPT-5
winner76.0
Rank #46/106 · confidence 1 · eval date 2025-08-07
O3
73.3
Rank #55/106 · confidence 1 · eval date 2025-04-16
GPT-5
67.3%
Rank #148/218 · confidence 4
O3
winner82.7%
Rank #83/218 · confidence 4
GPT-5
6.0%
Rank #158/216 · confidence 4
O3
winner20.1%
Rank #86/216 · confidence 4
GPT-5
55.8%
Rank #49/115 · confidence 4
O3
winner80.8%
Rank #16/115 · confidence 4
GPT-5
winner41.1
Rank #66/113 · confidence 2 · eval date 2025-08-07
O3
41.0
Rank #67/113 · confidence 1 · eval date 2025-04-16
GPT-5
99.1
Rank #2/2 · confidence 1 · eval date 2025-08-07
O3
winner99.2
Rank #1/2 · confidence 1 · eval date 2025-04-16
GPT-5
86.1%
Rank #42/73 · confidence 4
O3
winner99.2%
Rank #1/73 · confidence 4
GPT-5
36.7%
Rank #35/68 · confidence 4
O3
winner90.3%
Rank #3/68 · confidence 4
GPT-5
83.2
Rank #32/106 · confidence 1 · eval date 2025-08-07
O3
winner88.1
Rank #24/106 · confidence 1 · eval date 2025-04-16
GPT-5
winner39.5
Rank #38/106 · confidence 1 · eval date 2025-08-07
O3
38.6
Rank #40/106 · confidence 1 · eval date 2025-04-16
GPT-5
22.9
Rank #76/117 · confidence 1 · eval date 2025-08-07
O3
winner31.1
Rank #45/117 · confidence 1 · eval date 2025-04-16
GPT-5
winner25.4
Rank #60/114 · confidence 1 · eval date 2025-08-07
O3
20.1
Rank #71/114 · confidence 1 · eval date 2025-04-16
GPT-5
winner84.2
Rank #64/113 · confidence 1 · eval date 2025-08-07
O3
82.7
Rank #71/113 · confidence 1 · eval date 2025-04-16
GPT-5
winner74.3
Rank #38/68 · confidence 1 · eval date 2025-08-07
O3
70.1
Rank #50/68 · confidence 1 · eval date 2025-04-16
GPT-5
winner1199.0
Rank #52/78 · confidence 1 · eval date 2025-08-07
O3
1047.0
Rank #71/78 · confidence 1 · eval date 2025-04-16
GPT-5
70.6
Rank #32/84 · confidence 1 · eval date 2025-08-07
O3
winner71.4
Rank #30/84 · confidence 1 · eval date 2025-04-16
GPT-5
winner86.5
Rank #39/82 · confidence 1 · eval date 2025-08-07
O3
80.7
Rank #54/82 · confidence 1 · eval date 2025-04-16
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 | GPT-5 | O3 |
|---|---|---|
| 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 | GPT-5 | O3 |
|---|---|---|
V-API20 tests | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
EasyMore5 tests | GPT-5 speed / latency 46 tok/s / 6577ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
N1N5 tests | GPT-5 speed / latency 102 tok/s / 948ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
Undy API5 tests | GPT-5 speed / latency 131 tok/s / 743ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
简易-API中转站5 tests | GPT-5 speed / latency 58 tok/s / 17419ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
GPT-5 gpt-5 speed / latency No data input / output $0/request | O3 o3-2025-04-16 speed / latency No data input / output $0/request | |
GPT-5 gpt-5 speed / latency No data input / output $0.0068/request | O3 o3 speed / latency No data input / output $0.034/request | |
GPT-5 gpt-5-all speed / latency No data input / output $0.0068/request | O3 o3-all speed / latency No data input / output $0.055/request | |
GPT-5 gpt-5-all speed / latency No data input / output $0.0068/request | O3 o3-all speed / latency No data input / output $0.055/request | |
GPT-5 gpt-5-all-c speed / latency No data input / output $0.0074/request | O3 o3-all speed / latency No data input / output $0.062/request |
FAQ
Weighted outcome: O3. 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.