DeepSeek V4.1 Flash vs Qwen3.5 397B A17B

Price, context window & benchmark comparison

DeepSeek V4.1 Flash

DeepSeek

$0.14 / $0.42

Input / Output · per 1M tokens

Qwen3.5 397B A17B

Qwen (Alibaba)

$0.55 / $3.50

Input / Output · per 1M tokens

Compare different models

Verdict: DeepSeek V4.1 Flash is 6.1× cheaper than Qwen3.5 397B A17B on a typical 3:1 input/output mix. DeepSeek V4.1 Flash scores higher on the Artificial Analysis Intelligence Index (39.5 vs 18.4). DeepSeek V4.1 Flash has the larger context window (1M vs 262K).

	DeepSeek V4.1 Flash	Qwen3.5 397B A17B
Input price / 1M	$0.14	$0.55
Output price / 1M	$0.42	$3.50
Blended price (3:1)	$0.21	$1.29
Cached input / 1M	$0.0042	$0.23
Context window	1M	262K
Max output	131K	236K
Intelligence index	39.5	18.4
Coding index	—	48.2
Providers	26	—
Best provider uptime (30m)	100.0%	—
Vision input	Yes	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-09-10	2026-02-16
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, DeepSeek V4.1 Flash or Qwen3.5 397B A17B?

DeepSeek V4.1 Flash is 6.1× cheaper than Qwen3.5 397B A17B on a typical 3:1 input/output mix.

DeepSeek V4.1 Flash vs Qwen3.5 397B A17B: which has a bigger context window?

DeepSeek V4.1 Flash: 1,048,576 tokens. Qwen3.5 397B A17B: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: DeepSeek V4.1 Flash ≈ $490.00, Qwen3.5 397B A17B ≈ $2,850.

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