Name: DeepSeek V4 Pro
Author: DeepSeek

Question 1

What does this DeepSeek V4 Pro vs Qwen/Qwen3.5-9B comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: DeepSeek V4 Pro or Qwen/Qwen3.5-9B?

Accepted Answer

DeepSeek V4 Pro lists $0.435 input and $0.87 output per 1M tokens. Qwen/Qwen3.5-9B lists $0.04 input and $0.15 output. The cheaper workload depends on the mix of input and output. Long-context tiers, caching, batch processing and retries can change the bill.

Question 3

Which has the larger context window: DeepSeek V4 Pro or Qwen/Qwen3.5-9B?

Accepted Answer

DeepSeek V4 Pro lists 1M tokens and Qwen/Qwen3.5-9B lists 262.14K. DeepSeek V4 Pro therefore has the larger recorded context window, but capacity alone is not a quality score.

Question 4

Which is faster: DeepSeek V4 Pro or Qwen/Qwen3.5-9B?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do DeepSeek V4 Pro and Qwen/Qwen3.5-9B support?

Accepted Answer

DeepSeek V4 Pro records text input and text output. Qwen/Qwen3.5-9B records image, text input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose DeepSeek V4 Pro or Qwen/Qwen3.5-9B?

Accepted Answer

Consider DeepSeek V4 Pro if you need larger context or larger maximum output. Consider Qwen/Qwen3.5-9B if you need a lower listed input rate or a lower listed output rate. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	DeepSeek V4 Pro	Qwen/Qwen3.5-9B
Provider	DeepSeek	Qwen
Listed pricing route	DeepSeek	Qwen
Model family	deepseek-thinking	—
Accepted inputs	text	image, text
Produced outputs	text	text
Context window	1MHigher	262.14K
Max output	384KHigher	262.14K
Input price / 1M	$0.435	$0.04Lower
Output price / 1M	$0.87	$0.15Lower
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Not documented	Documented
Audio input	Not documented	Not documented
Structured output	Documented	Not documented
License	Open weights	Not documented

DeepSeek V4 Pro vs Qwen/Qwen3.5-9B

DeepSeek V4 Pro

Qwen/Qwen3.5-9B

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

Compare a different pair