Model Comparison
GPT-5.6 Sol vs Qwen3.5-4BWhich is better in 2026?
GPT-5.6 Sol significantly outperforms across most benchmarks.
Verdict: GPT-5.6 Sol vs Qwen3.5-4B — which is better?
GPT-5.6 Sol (by OpenAI) and Qwen3.5-4B (by Alibaba Cloud / Qwen Team) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
GPT-5.6 Sol outperforms in 1 benchmarks (GPQA), while Qwen3.5-4B is better at 0 benchmarks. GPT-5.6 Sol significantly outperforms across most benchmarks.
Choose GPT-5.6 Sol if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you want the most recent training data — it shipped Jul 2026
Choose Qwen3.5-4B if…
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.6 Sol outperforms in 1 benchmarks (GPQA), while Qwen3.5-4B is better at 0 benchmarks.
GPT-5.6 Sol significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only GPT-5.6 Sol specifies input context (1,050,000 tokens). Only GPT-5.6 Sol specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
Both GPT-5.6 Sol and Qwen3.5-4B support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.6 Sol
Qwen3.5-4B
License
Usage and distribution terms
GPT-5.6 Sol is licensed under a proprietary license, while Qwen3.5-4B uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
GPT-5.6 Sol was released on 2026-07-09, while Qwen3.5-4B was released on 2026-03-02.
GPT-5.6 Sol is 4 months newer than Qwen3.5-4B.
Jul 9, 2026
2 weeks ago
4mo newerMar 2, 2026
4 months ago
Knowledge Cutoff
When training data ends
GPT-5.6 Sol has a documented knowledge cutoff of 2026-02-16, while Qwen3.5-4B's cutoff date is not specified.
We can confirm GPT-5.6 Sol's training data extends to 2026-02-16, but cannot make a direct comparison without Qwen3.5-4B's cutoff date.
Feb 2026
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Outputs Comparison
Key Takeaways
GPT-5.6 Sol
View detailsOpenAI
Qwen3.5-4B
View detailsAlibaba Cloud / Qwen Team
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.6 Sol and Qwen3.5-4B side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.6 Sol vs Qwen3.5-4B.