Data points: 127
Model compare
The readout for GPT-5.1 and GPT-5.4, before the detailed comparison sheet.
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 12 to 88.
Evidence depth
127 data points
Includes 29 benchmark rows, 1 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 36 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 GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 12.0 pts | 88.0 pts |
| Benchmark category leads | 0 categories | 6 categories |
| Operational advantages | Average speed, First-token latency | Provider coverage |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K 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 | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 has these operational advantages: Average speed, First-token latency.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (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-5.1
52
Avg. score
GPT-5.4
57.4
GPT-5.4 leads by 8.4
GPT-5.4 leads by 13.8
GPT-5.4 leads by 4.0
GPT-5.4 leads by 6.0
GPT-5.4 leads by 3.6
No data
GPT-5.4
GPT-5.4 leads by 0.4
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
56.0
Rank #41/84 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner67.0
Rank #19/84 · confidence 3 · eval date 2026-03-05
GPT-5.1
winner$1.25/M
Rank #107/162 · confidence 4
GPT-5.4
$2.50/M
Rank #131/162 · confidence 4
GPT-5.1
winner$3.44/M
Rank #117/162 · confidence 4
GPT-5.4
$5.63/M
Rank #135/162 · confidence 4
GPT-5.1
winner$10.00/M
Rank #120/162 · confidence 4
GPT-5.4
$15.00/M
Rank #136/162 · confidence 4
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GPT-5.4
74.0
Rank #6/89 · confidence 3 · eval date 2026-03-05
GPT-5.1
4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner23.4
Rank #7/73 · confidence 3 · eval date 2026-03-05
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
GPT-5.4
74.8%
Rank #96/188 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
GPT-5.4
10.6%
Rank #91/187 · confidence 4
GPT-5.1
24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner67.4
Rank #3/33 · confidence 3 · eval date 2026-03-05
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner56.6
Rank #4/96 · confidence 3 · eval date 2026-03-05
GPT-5.1
49.4
Rank #32/59 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner71.0
Rank #11/59 · confidence 3 · eval date 2026-03-05
GPT-5.1
43.3%
Rank #42/185 · confidence 4
GPT-5.4
winner47.1%
Rank #24/185 · confidence 4
GPT-5.1
31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner47.6
Rank #7/47 · confidence 3 · eval date 2026-03-05
GPT-5.1
12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner27.1
Rank #8/35 · confidence 3 · eval date 2026-03-05
GPT-5.1
49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner65.9
Rank #17/56 · confidence 3 · eval date 2026-03-05
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner41.6
Rank #8/96 · confidence 3 · eval date 2026-03-05
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner50.0
Rank #9/90 · confidence 3 · eval date 2026-03-05
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner51.4
Rank #10/99 · confidence 3 · eval date 2026-03-05
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner92.0
Rank #11/96 · confidence 3 · eval date 2026-03-05
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner88.6
Rank #18/90 · confidence 3 · eval date 2026-03-05
GPT-5.1
5.6
Rank #19/29 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner5.7
Rank #18/29 · confidence 3 · eval date 2026-03-05
GPT-5.1
75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner78.4
Rank #16/57 · confidence 3 · eval date 2026-03-05
GPT-5.1
1212.0
Rank #38/66 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner1245.0
Rank #32/66 · confidence 3 · eval date 2026-03-05
GPT-5.1
72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner73.9
Rank #24/86 · confidence 3 · eval date 2026-03-05
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner64.9
Rank #4/50 · confidence 3 · eval date 2026-03-05
GPT-5.1
21.0
Rank #36/55 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner41.1
Rank #12/55 · confidence 3 · eval date 2026-03-05
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner44.6
Rank #12/50 · confidence 3 · eval date 2026-03-05
GPT-5.1
988.0
Rank #35/55 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner1392.0
Rank #12/55 · confidence 3 · eval date 2026-03-05
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
GPT-5.4
winner87.1
Rank #37/84 · confidence 3 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | GPT-5.1 gpt-5.1-2025-11-13 No audit yet | GPT-5.4 gpt-5.4 Audit score 93 1008486100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.1 | GPT-5.4 |
|---|---|---|
100 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
50 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
41 tests | GPT-5.1 speed / latency 139 tok/s / 1654ms input / output No data | GPT-5.4 speed / latency 43 tok/s / 12778ms input / output No data |
20 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 4032ms input / output No data |
20 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
GPT-5.1 gpt-5.1-all speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.4. 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 |
|---|
