Data points: 133
Model compare
The readout for GPT-5.1 and GPT-5.4 Mini, before the detailed comparison sheet.
Weighted outcome: GPT-5.4 Mini. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4 Mini
GPT-5.4 Mini has the higher weighted result; Model A / B score 38.7 to 61.3.
Evidence depth
133 data points
Includes 29 benchmark rows, 2 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.4 Mini
The charts below split 38 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 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | GPT-5.4 Mini |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 38.7 pts | 61.3 pts |
| Benchmark category leads | 2 categories | 4 categories |
| Operational advantages | Average speed, First-token latency, Free providers | Cheapest input price, Provider coverage |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input ImageTextFile Output Text | Input |
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 Mini |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2025-08-31 |
| OpenRouter ID | openai/gpt-5.1 | openai/gpt-5.4-mini |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Knowledge, Math) and operational dimensions (Average speed, First-token latency, Free providers).
GPT-5.4 Mini
GPT-5.4 Mini is stronger in benchmark categories (Agents, Coding, Reasoning, Instruction following) and operational dimensions (Cheapest input price, 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
52.1
Avg. score
GPT-5.4 Mini
52
GPT-5.4 Mini leads by 3.3
GPT-5.4 Mini leads by 8.4
GPT-5.4 Mini leads by 3.8
GPT-5.1 leads by 6.1
GPT-5.1 leads by 4.3
No data
GPT-5.4 Mini
GPT-5.4 Mini leads by 0.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
56.0
Rank #44/83 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner59.0
Rank #35/83 · confidence 3 · eval date 2026-03-17
GPT-5.1
111.6 tok/s
Rank #60/136 · confidence 4
GPT-5.4 Mini
winner203.4 tok/s
Rank #23/136 · confidence 4
GPT-5.1
35.90 s
Rank #113/136 · confidence 4
GPT-5.4 Mini
winner9.70 s
Rank #71/136 · confidence 4
GPT-5.1
35.90 s
Rank #128/136 · confidence 4
GPT-5.4 Mini
winner9.70 s
Rank #113/136 · confidence 4
GPT-5.1
$1.25/M
Rank #108/162 · confidence 4
GPT-5.4 Mini
winner$0.750/M
Rank #95/162 · confidence 4
GPT-5.1
$3.44/M
Rank #118/162 · confidence 4
GPT-5.4 Mini
winner$1.69/M
Rank #96/162 · confidence 4
GPT-5.1
$10.00/M
Rank #121/162 · confidence 4
GPT-5.4 Mini
winner$4.50/M
Rank #103/162 · confidence 4
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
69.3
Rank #22/89 · confidence 3 · eval date 2026-03-17
GPT-5.1
4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner10.0
Rank #20/73 · confidence 3 · eval date 2026-03-17
GPT-5.1
winner87.3%
Rank #32/187 · confidence 4
GPT-5.4 Mini
82.3%
Rank #63/187 · confidence 4
GPT-5.1
winner26.5%
Rank #39/186 · confidence 4
GPT-5.4 Mini
17.1%
Rank #64/186 · confidence 4
GPT-5.1
24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner48.0
Rank #10/33 · confidence 3 · eval date 2026-03-17
GPT-5.1
49.4
Rank #32/58 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner56.1
Rank #23/58 · confidence 3 · eval date 2026-03-17
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner49.9
Rank #23/96 · confidence 3 · eval date 2026-03-17
GPT-5.1
43.3%
Rank #41/184 · confidence 4
GPT-5.4 Mini
winner44.2%
Rank #37/184 · confidence 4
GPT-5.1
winner12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
2.1
Rank #35/35 · confidence 3 · eval date 2026-03-17
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
28.3
Rank #20/47 · confidence 3 · eval date 2026-03-17
GPT-5.1
winner49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
44.7
Rank #32/56 · confidence 3 · eval date 2026-03-17
GPT-5.1
51.3
Rank #66/90 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner89.8
Rank #14/90 · confidence 3 · eval date 2026-03-17
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner40.0
Rank #30/99 · confidence 3 · eval date 2026-03-17
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
37.5
Rank #32/90 · confidence 3 · eval date 2026-03-17
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner87.5
Rank #34/96 · confidence 3 · eval date 2026-03-17
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner26.6
Rank #38/96 · confidence 3 · eval date 2026-03-17
GPT-5.1
winner75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
73.3
Rank #33/57 · confidence 3 · eval date 2026-03-17
GPT-5.1
72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner73.3
Rank #26/86 · confidence 3 · eval date 2026-03-17
GPT-5.1
21.0
Rank #36/54 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner30.2
Rank #20/54 · confidence 3 · eval date 2026-03-17
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner33.5
Rank #24/50 · confidence 3 · eval date 2026-03-17
GPT-5.1
987.0
Rank #35/54 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner1171.0
Rank #24/54 · confidence 3 · eval date 2026-03-17
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
GPT-5.4 Mini
winner83.3
Rank #49/84 · confidence 3 · eval date 2026-03-17
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | GPT-5.4 Mini |
|---|---|---|
Winner: GPT-5.4 Mini | GPT-5.1 gpt-5.1-chat-latest No audit yet | GPT-5.4 Mini gpt-5.4-mini Audit score 97 10010086100 |
Winner: GPT-5.4 Mini | GPT-5.1 gpt-5.1-chat-latest No audit yet | GPT-5.4 Mini gpt-5.4-mini 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 Mini |
|---|---|---|
30 tests | GPT-5.1 speed / latency 152 tok/s / 936ms input / output No data | GPT-5.4 Mini speed / latency 139 tok/s / 2844ms input / output No data |
15 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 Mini speed / latency 108 tok/s / 1950ms input / output No data |
10 tests | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data | GPT-5.4 Mini speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 Mini speed / latency 123 tok/s / 8529ms input / output No data |
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.4 Mini speed / latency 93 tok/s / 4063ms input / output No data |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0/request | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0.135/M | |
GPT-5.1 gpt-5.1-chat speed / latency No data input / output $0/request | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.4 Mini. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
