Which is cheaper, DeepSeek V3.1 Terminus or GPT-5.6 Luna?

DeepSeek V3.1 Terminus, at $1.45 per million tokens against $1.80 for GPT-5.6 Luna, three parts input to one part output, read on 16 Sept 2026.

Where is each one cheapest?

DeepSeek V3.1 Terminus: $1.45 at NanoGPT. GPT-5.6 Luna: nobody goes below the maker's own price with a reason we can point at, so $1.80 is the number to beat.

Can I buy both from one provider?

Yes. 9 providers sell both: NanoGPT, Kilo Gateway, Nous Portal, OpenRouter, Vercel AI Gateway, Atlas Cloud, and more. The cheapest of them for the two together is NanoGPT.

Which holds more context?

GPT-5.6 Luna, at 1.1M tokens against 164k.

DeepSeek V3.1 Terminus vs GPT-5.6 Luna.

model vs model · prices as of 16 Sept 2026

GPT-5.6 Luna takes 3 of 5 rounds against DeepSeek V3.1 Terminus. DeepSeek V3.1 Terminus counters on price: $1.45 per million tokens against $1.80, for 164k context instead of 1.1M.

DeepSeek

DeepSeek V3.1 Terminus

$1.45/M tokens

cheapest we can explain, at NanoGPT · $0.192 per 1,000 pages

164k context · tool calling · open weights

NanoGPT ↗

OpenAIwins 3 rounds

GPT-5.6 Luna

$1.80/M tokens

OpenAI list price, nothing below it is accounted for · $0.192 per 1,000 pages

1.1M context · tool calling · reads images

List price in (lower wins)

$0.27/M

$0.20/M

List price out (lower wins)

$1/M

$1.20/M

Cheapest we can explain (lower wins)

$1.45/M at NanoGPT

none below list

Standard price (lower wins)

$1.81/M

$1.80/M

Cost per 1,000 pages (lower wins)

$0.192

Context

164k tokens

1.1M tokens

Open weights

yes

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

22 Sept 2025

9 Jul 2026

Providers selling it

Price we measure against

OpenRouter

the maker's own

Trains on your prompts (no is better)

not stated

no provider to check

Providers selling both · 9

NanoGPT$1.45 / $1.80
Kilo Gateway$1.81 / $1.80
Nous Portal$1.81 / $1.80
OpenRouter$1.81 / $1.80
Vercel AI Gateway$1.81 / $1.80
Atlas Cloud$1.85 / $1.80
Eden AI$1.76 / $1.98
TrustedRouter$1.86 / $1.90

DeepSeek V3.1 Terminus then GPT-5.6 Luna, per million tokens · showing the 8 cheapest of 9

Go further

open in the compare tool →every price for DeepSeek V3.1 Terminus every price for GPT-5.6 Luna

Add a third or fourth model, or switch the weighting, in the tool.

What moved in the last seven days

DeepSeek V3.1 TerminusNous Portal$0.22 / $0.80 $0.27 / $125% dearer · 16 Sept 2026
GPT-5.6 LunaNous Portal$0.16 / $0.96 $0.20 / $1.2025% dearer · 16 Sept 2026
GPT-5.6 LunaRequesty$0.20 / $1.20 $0.22 / $1.3210% dearer · 16 Sept 2026

Frequently asked

Which is cheaper, DeepSeek V3.1 Terminus or GPT-5.6 Luna?: DeepSeek V3.1 Terminus, at $1.45 per million tokens against $1.80 for GPT-5.6 Luna, three parts input to one part output, read on 16 Sept 2026.
Where is each one cheapest?: DeepSeek V3.1 Terminus: $1.45 at NanoGPT. GPT-5.6 Luna: nobody goes below the maker's own price with a reason we can point at, so $1.80 is the number to beat.
Can I buy both from one provider?: Yes. 9 providers sell both: NanoGPT, Kilo Gateway, Nous Portal, OpenRouter, Vercel AI Gateway, Atlas Cloud, and more. The cheapest of them for the two together is NanoGPT.
Which holds more context?: GPT-5.6 Luna, at 1.1M tokens against 164k.

Prices exclude tax and are per million tokens, read 16 Sept 2026 from each provider's own catalog. The standard price blends three parts input to one part output; a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.