Data points: 127
Model compare
The readout for GPT-4o and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 4 to 96.
Evidence depth
127 data points
Includes 31 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 37 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-4o and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4o | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 4.0 pts | 96.0 pts |
| Benchmark category leads | 0 categories | 8 categories |
| Operational advantages | Free providers | Cheapest input price, Average speed, First-token latency, Provider coverage |
| Context window | 128K tokens | 400K tokens |
| Max output | 16.4K tokens | 128K 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-4o | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2024 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2023-10-31 | No data |
| OpenRouter ID | openai/gpt-4o | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-4o and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4o
GPT-4o has these operational advantages: Free providers.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, Average speed, First-token latency, Provider coverage).
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-4o
44
Avg. score
GPT-5.1
55.5
GPT-5.1 leads by 9.0
GPT-5.1 leads by 11.4
GPT-5.1 leads by 12.2
GPT-5.1 leads by 12.8
GPT-5.1 leads by 11.9
GPT-5.1 leads by 9.1
GPT-5.1 leads by 13.4
GPT-5.1 leads by 12.6
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-4o
41.0
Rank #86/127 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner72.0
Rank #27/127 · confidence 1 · eval date 2025-11-13
GPT-4o
winner0.49 s
Rank #8/139 · confidence 4
GPT-5.1
30.09 s
Rank #103/139 · confidence 4
GPT-4o
winner0.49 s
Rank #12/139 · confidence 4
GPT-5.1
30.09 s
Rank #127/139 · confidence 4
GPT-4o
winner194.4 tok/s
Rank #21/139 · confidence 4
GPT-5.1
109.7 tok/s
Rank #55/139 · confidence 4
GPT-4o
$2.50/M
Rank #133/163 · confidence 4
GPT-5.1
winner$1.25/M
Rank #109/163 · confidence 4
GPT-4o
$4.38/M
Rank #129/163 · confidence 4
GPT-5.1
winner$3.44/M
Rank #119/163 · confidence 4
GPT-4o
$10.00/M
Rank #122/163 · confidence 4
GPT-5.1
$10.00/M
Rank #122/163 · confidence 4
GPT-4o
74.8%
Rank #90/125 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
GPT-4o
44.4
Rank #46/70 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner65.4
Rank #23/70 · confidence 1 · eval date 2025-11-13
GPT-4o
54.3%
Rank #155/187 · confidence 4
GPT-5.1
winner87.3%
Rank #32/187 · confidence 4
GPT-4o
3.3%
Rank #179/186 · confidence 4
GPT-5.1
winner26.5%
Rank #39/186 · confidence 4
GPT-4o
30.9%
Rank #88/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GPT-4o
8.3
Rank #75/85 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner45.5
Rank #19/85 · confidence 1 · eval date 2025-11-13
GPT-4o
33.3%
Rank #119/184 · confidence 4
GPT-5.1
winner43.3%
Rank #41/184 · confidence 4
GPT-4o
33.3
Rank #80/96 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-4o
35.0
Rank #80/100 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner64.9
Rank #52/100 · confidence 1 · eval date 2025-11-13
GPT-4o
0.3
Rank #47/47 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GPT-4o
25.8
Rank #56/59 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner47.5
Rank #35/59 · confidence 1 · eval date 2025-11-13
GPT-4o
33.2
Rank #80/92 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner76.9
Rank #22/92 · confidence 1 · eval date 2025-11-13
GPT-4o
19.7
Rank #75/90 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GPT-4o
54.3
Rank #91/96 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GPT-4o
3.3
Rank #94/96 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-4o
11.2
Rank #90/99 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GPT-4o
37.9
Rank #75/90 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner51.3
Rank #66/90 · confidence 1 · eval date 2025-11-13
GPT-4o
42.0
Rank #41/62 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner84.0
Rank #8/62 · confidence 1 · eval date 2025-11-13
GPT-4o
62.1
Rank #45/81 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner91.9
Rank #1/81 · confidence 1 · eval date 2025-11-13
GPT-4o
866.0
Rank #64/65 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner1222.0
Rank #37/65 · confidence 1 · eval date 2025-11-13
GPT-4o
34.3
Rank #82/86 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GPT-4o
59.9
Rank #53/75 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner72.5
Rank #35/75 · confidence 1 · eval date 2025-11-13
GPT-4o
36.9
Rank #70/95 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner70.5
Rank #29/95 · confidence 1 · eval date 2025-11-13
GPT-4o
25.1
Rank #75/84 · confidence 1 · eval date 2024-05-13
GPT-5.1
winner81.9
Rank #54/84 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-4o | GPT-5.1 |
|---|---|---|
| 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-4o | GPT-5.1 |
|---|---|---|
20 tests | GPT-4o speed / latency 88 tok/s / 1593ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | GPT-4o speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data |
10 tests | GPT-4o speed / latency 57 tok/s / 3381ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | GPT-4o speed / latency 48 tok/s / 13138ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | GPT-4o speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
GPT-4o gpt-4o-2024-11-20 speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeWeb search | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
