Data points: 119
Model compare
The readout for GPT-5.1 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 46.7 to 53.3.
Evidence depth
119 data points
Includes 27 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with O3
The charts below split 33 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-5.1 and O3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | O3 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 46.7 pts | 53.3 pts |
| Benchmark category leads | 2 categories | 4 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 200K tokens |
| Max output | 128K tokens | 100K tokens |
| Modalities | Input ImageTextFile 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-5.1 | O3 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Apr 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2024-06-30 |
| OpenRouter ID | openai/gpt-5.1 | openai/o3 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and O3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Knowledge, Instruction following) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
O3
O3 leads these benchmark categories: Agents, Coding, Reasoning, Math.
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-5.1
52.1
Avg. score
O3
53.7
O3 leads by 1.7
O3 leads by 6.5
O3 leads by 2.2
GPT-5.1 leads by 5.4
O3 leads by 4.9
No data
No data
GPT-5.1 leads by 0.5
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
winner56.0
Rank #44/83 · confidence 1 · eval date 2025-11-13
O3
50.0
Rank #59/83 · confidence 1 · eval date 2025-04-16
GPT-5.1
111.6 tok/s
Rank #60/136 · confidence 4
O3
winner153.2 tok/s
Rank #39/136 · confidence 4
GPT-5.1
35.90 s
Rank #113/136 · confidence 4
O3
winner5.95 s
Rank #65/136 · confidence 4
GPT-5.1
35.90 s
Rank #128/136 · confidence 4
O3
winner5.95 s
Rank #111/136 · confidence 4
GPT-5.1
winner$1.25/M
Rank #108/162 · confidence 4
O3
$2.00/M
Rank #124/162 · confidence 4
GPT-5.1
$10.00/M
Rank #121/162 · confidence 4
O3
winner$8.00/M
Rank #115/162 · confidence 4
GPT-5.1
winner$3.44/M
Rank #118/162 · confidence 4
O3
$3.50/M
Rank #124/162 · confidence 4
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
O3
69.3
Rank #22/89 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
O3
85.3%
Rank #24/125 · confidence 4
GPT-5.1
winner87.3%
Rank #32/187 · confidence 4
O3
82.7%
Rank #59/187 · confidence 4
GPT-5.1
winner4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
O3
1.1
Rank #54/73 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner26.5%
Rank #39/186 · confidence 4
O3
20.0%
Rank #55/186 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
O3
80.8%
Rank #16/115 · confidence 4
GPT-5.1
winner43.3%
Rank #41/184 · confidence 4
O3
41.0%
Rank #57/184 · confidence 4
GPT-5.1
winner43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
O3
41.0
Rank #52/96 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
O3
2.1
Rank #32/35 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
O3
18.7
Rank #30/47 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
O3
38.0
Rank #39/56 · confidence 1 · eval date 2025-04-16
GPT-5.1
51.3
Rank #66/90 · confidence 1 · eval date 2025-11-13
O3
winner87.1
Rank #22/90 · confidence 1 · eval date 2025-04-16
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
O3
winner38.4
Rank #27/90 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
O3
82.7
Rank #54/96 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
O3
20.0
Rank #52/96 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
O3
30.4
Rank #57/99 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
O3
70.1
Rank #41/57 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner1220.0
Rank #37/65 · confidence 1 · eval date 2025-11-13
O3
1069.0
Rank #58/65 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
O3
71.4
Rank #34/86 · confidence 1 · eval date 2025-04-16
GPT-5.1
winner81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
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-5.1 | 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-5.1 | O3 |
|---|---|---|
10 tests | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | O3 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | O3 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | O3 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | O3 speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5.1-chat-latest 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 |
|---|
