Qwen3.5-Flash vs Doubao Seed 2.0 Mini — LLM API Cost Comparison
Compare Qwen3.5-Flash (Qwen (Alibaba)) vs Doubao Seed 2.0 Mini (Doubao (ByteDance)) on cost per million tokens, context window, and monthly spend.
Prices verified 2026-05-20 · Pricing may change — use the calculator for current estimates
- Input
- $0.028/1M tokens
- Output
- $0.28/1M tokens
- Context
- 131K tokens
- Released
- 2026-03
Ultra-cheap high-volume tier; one of the lowest prices among capable models
- Input
- $0.03/1M tokens
- Output
- $0.29/1M tokens
- Context
- 32K tokens
- Released
- 2026-04
Ultra-low cost ByteDance model; ideal for chat and classification at scale
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | Qwen3.5-Flash | Doubao Seed 2.0 Mini | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $0.104 | $0.108 | Qwen3.5-Flash (4%) |
| Moderate (10M tokens) | $1.04 | $1.08 | Qwen3.5-Flash (4%) |
| Heavy (100M tokens) | $10.36 | $10.80 | Qwen3.5-Flash (4%) |
| Very Heavy (1B tokens) | $104 | $108 | Qwen3.5-Flash (4%) |
Frequently Asked Questions
Which is cheaper — Qwen3.5-Flash or Doubao Seed 2.0 Mini?
For input tokens, Qwen3.5-Flash is cheaper at $0.028/1M tokens — 1.1× less than $0.03/1M. For output tokens, Qwen3.5-Flash wins at $0.28/1M vs $0.29/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between Qwen3.5-Flash and Doubao Seed 2.0 Mini?
Qwen3.5-Flash supports 131,072 tokens per request; Doubao Seed 2.0 Mini supports 32,000 tokens. Qwen3.5-Flash wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose Qwen3.5-Flash over Doubao Seed 2.0 Mini?
Choose Qwen3.5-Flash (Qwen (Alibaba)) if you prefer Qwen (Alibaba)'s ecosystem, tooling, or reliability track record. Ultra-cheap high-volume tier; one of the lowest prices among capable models. Choose Doubao Seed 2.0 Mini (Doubao (ByteDance)) if Ultra-low cost ByteDance model; ideal for chat and classification at scale. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on Qwen3.5-Flash vs Doubao Seed 2.0 Mini?
At 700M input + 300M output tokens (1B total): Qwen3.5-Flash costs $104; Doubao Seed 2.0 Mini costs $108. The difference is $4/billion tokens at this 70/30 input/output ratio.