DeepSeek V4 Flash 0731 vs GPT-5.6 Luna Pro

Price, context window & benchmark comparison

DeepSeek V4 Flash 0731

DeepSeek

$0.03 / $0.32

Input / Output · per 1M tokens

GPT-5.6 Luna Pro

OpenAI

$0.20 / $1.20

Input / Output · per 1M tokens

Compare different models

Verdict: DeepSeek V4 Flash 0731 is 4.4× cheaper than GPT-5.6 Luna Pro on a typical 3:1 input/output mix. DeepSeek V4 Flash 0731 has the larger context window (1.3M vs 1.1M).

	DeepSeek V4 Flash 0731	GPT-5.6 Luna Pro
Input price / 1M	$0.03	$0.20
Output price / 1M	$0.32	$1.20
Blended price (3:1)	$0.10	$0.45
Cached input / 1M	$0.016	$0.02
Context window	1.3M	1.1M
Max output	944K	128K
Intelligence index	34.3	—
Coding index	69.1	—
Providers	30	5
Best provider uptime (30m)	100.0%	100.0%
Vision input	No	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-07-31	2026-07-09
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, DeepSeek V4 Flash 0731 or GPT-5.6 Luna Pro?

DeepSeek V4 Flash 0731 is 4.4× cheaper than GPT-5.6 Luna Pro on a typical 3:1 input/output mix.

DeepSeek V4 Flash 0731 vs GPT-5.6 Luna Pro: which has a bigger context window?

DeepSeek V4 Flash 0731: 1,310,720 tokens. GPT-5.6 Luna Pro: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: DeepSeek V4 Flash 0731 ≈ $220.00, GPT-5.6 Luna Pro ≈ $1,000.

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