DeepSeek V4 Flash 0731 vs Step 3.5 Flash

Price, context window & benchmark comparison

DeepSeek V4 Flash 0731

DeepSeek

$0.03 / $0.32

Input / Output · per 1M tokens

Step 3.5 Flash

StepFun

$0.10 / $0.30

Input / Output · per 1M tokens

Compare different models

Verdict: DeepSeek V4 Flash 0731 is 32% cheaper than Step 3.5 Flash on a typical 3:1 input/output mix. DeepSeek V4 Flash 0731 has the larger context window (1.3M vs 262K).

	DeepSeek V4 Flash 0731	Step 3.5 Flash
Input price / 1M	$0.03	$0.10
Output price / 1M	$0.32	$0.30
Blended price (3:1)	$0.10	$0.15
Cached input / 1M	$0.016	—
Context window	1.3M	262K
Max output	944K	66K
Intelligence index	34.3	—
Coding index	69.1	—
Providers	30	—
Best provider uptime (30m)	100.0%	—
Vision input	No	No
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-07-31	2026-01-29
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, DeepSeek V4 Flash 0731 or Step 3.5 Flash?

DeepSeek V4 Flash 0731 is 32% cheaper than Step 3.5 Flash on a typical 3:1 input/output mix.

DeepSeek V4 Flash 0731 vs Step 3.5 Flash: which has a bigger context window?

DeepSeek V4 Flash 0731: 1,310,720 tokens. Step 3.5 Flash: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: DeepSeek V4 Flash 0731 ≈ $220.00, Step 3.5 Flash ≈ $350.00.

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