Data points: 115
Model compare
The readout for GPT-4.1 Nano 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 8 to 92.
Evidence depth
115 data points
Includes 25 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 32 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-4.1 Nano and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4.1 Nano | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 6 categories |
| Operational advantages | Cheapest input price, First-token latency | Average speed, Free providers, Provider coverage |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 32.8K 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-4.1 Nano | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Apr 2025 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2024-06-30 | No data |
| OpenRouter ID | openai/gpt-4.1-nano | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-4.1 Nano and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4.1 Nano
GPT-4.1 Nano has these operational advantages: Cheapest input price, First-token latency.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Average speed, Free providers, 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-4.1 Nano
37.9
Avg. score
GPT-5.1
52
GPT-5.1 leads by 15.0
GPT-5.1 leads by 8.5
GPT-5.1 leads by 14.7
GPT-5.1 leads by 20.2
GPT-5.1 leads by 8.8
No data
No data
GPT-5.1 leads by 16.9
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-4.1 Nano
48.0
Rank #63/84 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner56.0
Rank #41/84 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
winner$0.100/M
Rank #7/162 · confidence 4
GPT-5.1
$1.25/M
Rank #107/162 · confidence 4
GPT-4.1 Nano
winner$0.175/M
Rank #11/162 · confidence 4
GPT-5.1
$3.44/M
Rank #117/162 · confidence 4
GPT-4.1 Nano
winner$0.400/M
Rank #12/162 · confidence 4
GPT-5.1
$10.00/M
Rank #120/162 · confidence 4
GPT-4.1 Nano
17.0
Rank #88/89 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
65.7%
Rank #111/125 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
GPT-4.1 Nano
51.2%
Rank #164/188 · confidence 4
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
GPT-4.1 Nano
3.9%
Rank #165/187 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
GPT-4.1 Nano
32.6%
Rank #84/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GPT-4.1 Nano
11.1
Rank #58/59 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner49.4
Rank #32/59 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
25.9%
Rank #156/185 · confidence 4
GPT-5.1
winner43.3%
Rank #42/185 · confidence 4
GPT-4.1 Nano
25.9
Rank #91/96 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
1.0
Rank #45/47 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
25.7
Rank #53/56 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
13.3
Rank #88/90 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
51.2
Rank #93/96 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
winner80.4
Rank #36/90 · confidence 1 · eval date 2025-04-14
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
3.9
Rank #91/96 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
9.6
Rank #94/99 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
40.1
Rank #56/57 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
1003.0
Rank #61/66 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner1217.0
Rank #39/66 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
32.0
Rank #83/86 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
63.0
Rank #54/55 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner988.0
Rank #35/55 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
1.2
Rank #53/55 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner21.0
Rank #36/55 · confidence 1 · eval date 2025-11-13
GPT-4.1 Nano
17.3
Rank #82/84 · confidence 1 · eval date 2025-04-14
GPT-5.1
winner81.9
Rank #52/84 · 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-4.1 Nano | 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-4.1 Nano | GPT-5.1 |
|---|---|---|
75 tests | GPT-4.1 Nano speed / latency 127 tok/s / 2007ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
25 tests | GPT-4.1 Nano speed / latency 162 tok/s / 1284ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
10 tests | GPT-4.1 Nano speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data |
5 tests | GPT-4.1 Nano speed / latency 222 tok/s / 800ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
5 tests | GPT-4.1 Nano speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
GPT-4.1 Nano gpt-4.1-nano speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request | |
GPT-4.1 Nano gpt-4.1-nano-2025-04-14 speed / latency No data input / output $0.0024/M/$0.0096/M | GPT-5.1 gpt-5.1-chat speed / latency No data input / output $0.856/M |
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 mode | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
