DeepSeek V4 Flash 0731 vs GPT-5.6 Luna

Price, context window & benchmark comparison

DeepSeek V4 Flash 0731

DeepSeek

$0.04 / $0.32

Input / Output · per 1M tokens

GPT-5.6 Luna

OpenAI

$0.20 / $1.20

Input / Output · per 1M tokens

Compare different models

Verdict: DeepSeek V4 Flash 0731 is 4.1× cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix. GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 34.3). DeepSeek V4 Flash 0731 has the larger context window (1.3M vs 1.1M).

	DeepSeek V4 Flash 0731	GPT-5.6 Luna
Input price / 1M	$0.04	$0.20
Output price / 1M	$0.32	$1.20
Blended price (3:1)	$0.11	$0.45
Cached input / 1M	$0.016	$0.02
Context window	1.3M	1.1M
Max output	944K	128K
Intelligence index	34.3	37.3
Coding index	69.1	71.4
Providers	30	7
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?

DeepSeek V4 Flash 0731 is 4.1× cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix.

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

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

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: DeepSeek V4 Flash 0731 ≈ $240.00, GPT-5.6 Luna ≈ $1,000.

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