DeepSeek V3.1 Terminus vs GPT-6 Luna

Price, context window & benchmark comparison

DeepSeek V3.1 Terminus

DeepSeek

$0.27 / $1.00

Input / Output · per 1M tokens

GPT-6 Luna

OpenAI

$0.10 / $0.50

Input / Output · per 1M tokens

Compare different models

Verdict: GPT-6 Luna is 2.3× cheaper than DeepSeek V3.1 Terminus on a typical 3:1 input/output mix. GPT-6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 14.8). GPT-6 Luna has the larger context window (1.1M vs 164K).

	DeepSeek V3.1 Terminus	GPT-6 Luna
Input price / 1M	$0.27	$0.10
Output price / 1M	$1.00	$0.50
Blended price (3:1)	$0.45	$0.20
Cached input / 1M	$0.14	$0.01
Context window	164K	1.1M
Max output	33K	128K
Intelligence index	14.8	37.3
Coding index	43.5	—
Providers	—	7
Best provider uptime (30m)	—	100.0%
Vision input	No	Yes
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2025-09-22	2026-09-22
Retirement	2026-09-28	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, DeepSeek V3.1 Terminus or GPT-6 Luna?

GPT-6 Luna is 2.3× cheaper than DeepSeek V3.1 Terminus on a typical 3:1 input/output mix.

DeepSeek V3.1 Terminus vs GPT-6 Luna: which has a bigger context window?

DeepSeek V3.1 Terminus: 163,840 tokens. GPT-6 Luna: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: DeepSeek V3.1 Terminus ≈ $1,040, GPT-6 Luna ≈ $450.00.

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