GPT-4.1 vs Qwen3.5 Plus 2026-04-20
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-4.1 and Qwen3.5 Plus 2026-04-20.
GPT-4.1
GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning. It supports a 1 million token context window and outperforms GPT-4o and...
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus (April 2026) is a large-scale multimodal language model from Alibaba. It accepts text, image, and video input and produces text output, with a 1M token context window. This...
Technical Specifications
| Specification | GPT-4.1 | Qwen3.5 Plus 2026-04-20 |
|---|---|---|
| Provider | OpenAI | Alibaba |
| Context Window | 1,047,576 tokens | 1,000,000 tokens |
| Agent Suitability | 91/100 | N/A |
| Time to First Token (TTFT) | 250 ms | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2025-04-14 | 2026-04-27 |
API Pricing Comparison
Input Price per Million Tokens
GPT-4.1
$2.00
Qwen3.5 Plus 2026-04-20
$0.30
Output Price per Million Tokens
GPT-4.1
$8.00
Qwen3.5 Plus 2026-04-20
$1.80
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-4.1 Quirks & Gotchas
- ▸Strong tool-calling reliability — good migration path from GPT-4o
- ▸Migrate to GPT-5 for larger context window and improved reasoning
Qwen3.5 Plus 2026-04-20 Quirks & Gotchas
No developer gotchas reported.