Data points: 118
Model compare
The readout for GPT-5 and O3, before the detailed comparison sheet.
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
118 data points
Includes 26 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with O3
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 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 |
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 | 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 |
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).
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
GPT-5
52
Avg. score
O3
53.7
O3 leads by 4.0
O3 leads by 6.6
O3 leads by 3.1
GPT-5 leads by 1.3
GPT-5 leads by 2.6
No data
No data
O3 leads by 0.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5
winner0.77 s
Rank #27/136 · confidence 4
O3
5.95 s
Rank #65/136 · confidence 4
GPT-5
winner0.77 s
Rank #38/136 · confidence 4
O3
5.95 s
Rank #111/136 · confidence 4
GPT-5
81.2 tok/s
Rank #82/136 · confidence 4
O3
winner153.2 tok/s
Rank #39/136 · confidence 4
GPT-5
winner$1.25/M
Rank #108/162 · confidence 4
O3
$2.00/M
Rank #124/162 · confidence 4
GPT-5
$10.00/M
Rank #121/162 · confidence 4
O3
winner$8.00/M
Rank #115/162 · confidence 4
GPT-5
winner$3.44/M
Rank #118/162 · confidence 4
O3
$3.50/M
Rank #124/162 · confidence 4
GPT-5
winner75.6
Rank #2/89 · confidence 1 · eval date 2025-08-07
O3
69.3
Rank #22/89 · confidence 1 · eval date 2025-04-16
GPT-5
80.6%
Rank #57/125 · confidence 4
O3
winner85.3%
Rank #24/125 · confidence 4
GPT-5
winner5.7
Rank #30/73 · confidence 1 · eval date 2025-08-07
O3
1.1
Rank #54/73 · confidence 1 · eval date 2025-04-16
GPT-5
5.4%
Rank #131/186 · confidence 4
O3
winner20.0%
Rank #55/186 · confidence 4
GPT-5
67.3%
Rank #120/187 · confidence 4
O3
winner82.7%
Rank #59/187 · confidence 4
GPT-5
55.8%
Rank #49/115 · confidence 4
O3
winner80.8%
Rank #16/115 · confidence 4
GPT-5
winner42.9
Rank #46/96 · confidence 1 · eval date 2025-08-07
O3
41.0
Rank #52/96 · confidence 1 · eval date 2025-04-16
GPT-5
38.8%
Rank #82/184 · confidence 4
O3
winner41.0%
Rank #57/184 · confidence 4
GPT-5
winner99.4
Rank #1/2 · confidence 1 · eval date 2025-08-07
O3
99.2
Rank #2/2 · confidence 1 · eval date 2025-04-16
GPT-5
86.1%
Rank #42/72 · confidence 4
O3
winner99.2%
Rank #1/72 · confidence 4
GPT-5
36.7%
Rank #35/68 · confidence 4
O3
winner90.3%
Rank #3/68 · confidence 4
GPT-5
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-08-07
O3
38.4
Rank #27/90 · confidence 1 · eval date 2025-04-16
GPT-5
82.1
Rank #32/90 · confidence 1 · eval date 2025-08-07
O3
winner87.1
Rank #22/90 · confidence 1 · eval date 2025-04-16
GPT-5
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-08-07
O3
20.0
Rank #52/96 · confidence 1 · eval date 2025-04-16
GPT-5
winner85.4
Rank #45/96 · confidence 1 · eval date 2025-08-07
O3
82.7
Rank #54/96 · confidence 1 · eval date 2025-04-16
GPT-5
winner34.7
Rank #48/99 · confidence 1 · eval date 2025-08-07
O3
30.4
Rank #57/99 · confidence 1 · eval date 2025-04-16
GPT-5
winner74.2
Rank #32/57 · confidence 1 · eval date 2025-08-07
O3
70.1
Rank #41/57 · confidence 1 · eval date 2025-04-16
GPT-5
winner1217.0
Rank #39/65 · confidence 1 · eval date 2025-08-07
O3
1069.0
Rank #58/65 · confidence 1 · eval date 2025-04-16
GPT-5
winner73.1
Rank #29/86 · confidence 1 · eval date 2025-08-07
O3
71.4
Rank #34/86 · confidence 1 · eval date 2025-04-16
GPT-5
winner84.8
Rank #44/84 · confidence 1 · eval date 2025-08-07
O3
80.7
Rank #53/84 · confidence 1 · eval date 2025-04-16
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. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5 | O3 |
|---|---|---|
20 tests | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5 speed / latency 46 tok/s / 6577ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5 speed / latency 102 tok/s / 948ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5 speed / latency 131 tok/s / 743ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
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 speed / latency No data input / output $5.88/request |
Weighted outcome: O3. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
