Doubao Seed 2.0 Pro vs Qwen 3.5
Comprehensive comparison between ByteDance's Doubao Seed 2.0 Pro and Alibaba (Qwen)'s Qwen 3.5. Compare pricing, performance, features, and user reviews.
Doubao Seed 2.0 Pro
ByteDanceByteDance's flagship foundation model, powering Doubao (China's #1 AI chatbot with 155M weekly users). Achieves frontier-level performance on math (AIME 98.3), coding (Codeforces 3020), and video understanding (VideoMME 89.5). Ranks 6th on LMSYS Text Arena and 3rd on Vision Arena. ~3.7x cheaper than GPT-5.2 on input, ~10x cheaper than Claude Opus 4.5.
Qwen 3.5
Alibaba (Qwen)Alibaba's flagship open-source MoE model with 397B total parameters (17B active per pass). Apache 2.0 licensed for commercial use. Supports 201 languages with native vision capabilities. Best open-weight model for local deployment.
Specs Comparison
| Specification | Doubao Seed 2.0 Pro | Qwen 3.5 |
|---|---|---|
| Context Window | 256K | 262K |
| Max Output | 128K | 32K |
| Input (per 1M tokens) | $0.47 | $0.39 |
| Output (per 1M tokens) | $2.37 | $1.56 |
| Reasoning | ||
| Open Source |
Scenario Score Comparison
Doubao Seed 2.0 Pro
Pros
- + Frontier math reasoning (AIME 98.3, IMO gold)
- + Industry-leading video understanding (VideoMME 89.5)
- + ~3.7x cheaper than GPT-5.2, ~10x cheaper than Claude
- + Strong agentic capabilities (BrowseComp 77.3)
- + 256K context with multimodal input
- + Massive user base and production-hardened
Cons
- − Code generation trails Claude Opus 4.5 (SWE-Bench 76.5 vs 80.9)
- − Hallucination control weaker than Western models
- − English optimization secondary to Chinese
- − Limited availability outside China (needs Volcengine account)
- − Near-zero brand recognition internationally
Qwen 3.5
Pros
- + Open source (Apache 2.0)
- + Self-hostable with vLLM
- + 201 language support
- + MoE efficiency (17B active)
- + Cheapest API among frontier-class
- + Strong vision/multimodal performance
Cons
- − Weaker on hard coding tasks vs Opus/GPT
- − Requires significant VRAM for local hosting
- − Quantization affects complex reasoning
- − Smaller context than GPT-5.4/Opus 4.6
Recommendation
Choose Doubao Seed 2.0 Pro if you:
- • Need frontier math reasoning (aime 98.3, imo gold)
- • Need industry-leading video understanding (videomme 89.5)
- • Need ~3.7x cheaper than gpt-5.2, ~10x cheaper than claude
Choose Qwen 3.5 if you:
- • Need open source (apache 2.0)
- • Need self-hostable with vllm
- • Need 201 language support
Based on scores across 2 scenarios, Qwen 3.5 performs better overall.
Get Started with Doubao Seed 2.0 Pro
Get Started with Qwen 3.5
Want to compare other models?
Custom Comparison