Data points: 87
Model compare
The readout for GPT-5.1 and O4 Mini, before the detailed comparison sheet.
Weighted outcome: O4 Mini. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
O4 Mini
O4 Mini has the higher weighted result; Model A / B score 20 to 80.
Evidence depth
87 data points
Includes 11 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with O4 Mini
The charts below split 17 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 O4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | O4 Mini |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 20.0 pts | 80.0 pts |
| Benchmark category leads | 0 categories | 3 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 | O4 Mini |
|---|---|---|
| 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/o4-mini |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and O4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 has these operational advantages: Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage.
O4 Mini
O4 Mini leads these benchmark categories: 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
O4 Mini
59.1
GPT-5.1
O4 Mini leads by 10.2
O4 Mini leads by 0.9
GPT-5.1
O4 Mini leads by 10.0
No data
No data
GPT-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
111.6 tok/s
Rank #60/136 · confidence 4
O4 Mini
winner184.2 tok/s
Rank #27/136 · confidence 4
GPT-5.1
35.90 s
Rank #113/136 · confidence 4
O4 Mini
winner21.45 s
Rank #93/136 · confidence 4
GPT-5.1
35.90 s
Rank #128/136 · confidence 4
O4 Mini
winner21.45 s
Rank #123/136 · confidence 4
GPT-5.1
$10.00/M
Rank #121/162 · confidence 4
O4 Mini
winner$4.40/M
Rank #98/162 · confidence 4
GPT-5.1
$3.44/M
Rank #118/162 · confidence 4
O4 Mini
winner$1.93/M
Rank #99/162 · confidence 4
GPT-5.1
$1.25/M
Rank #108/162 · confidence 4
O4 Mini
winner$1.10/M
Rank #103/162 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
O4 Mini
83.2%
Rank #40/125 · confidence 4
GPT-5.1
winner87.3%
Rank #32/187 · confidence 4
O4 Mini
78.4%
Rank #80/187 · confidence 4
GPT-5.1
winner26.5%
Rank #39/186 · confidence 4
O4 Mini
17.5%
Rank #63/186 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
O4 Mini
85.9%
Rank #6/115 · confidence 4
GPT-5.1
43.3%
Rank #41/184 · confidence 4
O4 Mini
winner46.5%
Rank #29/184 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | O4 Mini |
|---|---|---|
| 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 | O4 Mini |
|---|---|---|
30 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | O4 Mini speed / latency 93 tok/s / 7030ms input / output No data |
10 tests | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data | O4 Mini 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 | O4 Mini 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 | O4 Mini 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 | O4 Mini 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 | O4 Mini o4-mini speed / latency No data input / output $0/request |
Weighted outcome: O4 Mini. 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 |
|---|
