Data points: 69
Model compare
The readout for GPT-5.1 and Qwen3.5 Flash, 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 100 to 0.
Evidence depth
69 data points
Includes 3 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 11 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 Qwen3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | Qwen3.5 Flash |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 100.0 pts | 0.0 pts |
| Benchmark category leads | 1 categories | 0 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 1M tokens |
| Max output | 128K tokens | 65.5K 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 | Qwen3.5 Flash |
|---|---|---|
| Developer | OpenAI | No data |
| Released | Nov 2025 | Feb 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | Qwen3 |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | qwen/qwen3.5-flash-02-23 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and Qwen3.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Math) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
Qwen3.5 Flash
Qwen3.5 Flash does not clearly lead in the benchmark or operational dimensions shared by both models.
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
Qwen3.5 Flash
42.7
GPT-5.1
GPT-5.1
GPT-5.1
GPT-5.1
GPT-5.1 leads by 11.3
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
winner56.0
Rank #41/84 · confidence 1 · eval date 2025-11-13
Qwen3.5 Flash
45.0
Rank #68/84 · confidence 1 · eval date 2026-03-04
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
Qwen3.5 Flash
6.2
Rank #35/47 · confidence 1 · eval date 2026-03-04
GPT-5.1
winner49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
Qwen3.5 Flash
28.7
Rank #45/56 · confidence 1 · eval date 2026-03-04
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | Qwen3.5 Flash |
|---|---|---|
| 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 | Qwen3.5 Flash |
|---|---|---|
5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | Qwen3.5 Flash 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 | Qwen3.5 Flash 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 | Qwen3.5 Flash 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 | Qwen3.5 Flash 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 | Qwen3.5 Flash speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5-1 speed / latency No data input / output $0/request | Qwen3.5 Flash qwen3.5-flash speed / latency No data input / output $0.100/request | |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0041/request | Qwen3.5 Flash qwen3.5-flash speed / latency No data input / output $0.205/M | |
GPT-5.1 gpt-5.1-high speed / latency No data input / output $0.0068/request | Qwen3.5 Flash qwen3.5-flash speed / latency No data input / output $10.27/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 modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
