Qwen3.5 Plus 2026-02-15 vs Seed 1.6
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 Qwen3.5 Plus 2026-02-15 and Seed 1.6.
Qwen3.5 Plus 2026-02-15
The Qwen3.5 native vision-language series Plus models are built on a hybrid architecture that integrates linear attention mechanisms with sparse mixture-of-experts models, achieving higher inference efficiency. In a variety of...
Seed 1.6
Seed 1.6 is a general-purpose model released by the ByteDance Seed team. It incorporates multimodal capabilities and adaptive deep thinking with a 256K context window.
Technical Specifications
| Specification | Qwen3.5 Plus 2026-02-15 | Seed 1.6 |
|---|---|---|
| Provider | Alibaba | ByteDance |
| Context Window | 1,000,000 tokens | 262,144 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | self hostable | managed api |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-02-16 | 2025-12-23 |
API Pricing Comparison
Input Price per Million Tokens
Qwen3.5 Plus 2026-02-15
$0.26
Seed 1.6
$0.25
Output Price per Million Tokens
Qwen3.5 Plus 2026-02-15
$1.56
Seed 1.6
$2.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Qwen3.5 Plus 2026-02-15 Quirks & Gotchas
No developer gotchas reported.
Seed 1.6 Quirks & Gotchas
No developer gotchas reported.