Which is cheaper, GPT-5.1-Codex-Mini or Seed 1.6?

GPT-5.1-Codex-Mini, at $2.46 per million tokens against $2.75 for Seed 1.6, three parts input to one part output, read on 16 Sept 2026.

Where is each one cheapest?

GPT-5.1-Codex-Mini: $2.46 at Poe. Seed 1.6: nobody goes below OpenRouter's own price with a reason we can point at, so $2.75 is the number to beat.

Can I buy both from one provider?

Yes. 6 providers sell both: Eden AI, Kilo Gateway, LLM Gateway, Nous Portal, OpenRouter, Vercel AI Gateway. The cheapest of them for the two together is Eden AI.

Which holds more context?

GPT-5.1-Codex-Mini, at 400k tokens against 262k.

GPT-5.1-Codex-Mini vs Seed 1.6.

model vs model · prices as of 16 Sept 2026

GPT-5.1-Codex-Mini takes 2 of 5 rounds against Seed 1.6. It is also the cheaper of the two to run, at $2.46 per million tokens against $2.75.

OpenAIwins 2 rounds

GPT-5.1-Codex-Mini

$2.46/M tokens

cheapest we can explain, at Poe · $0.24 per 1,000 pages

400k context · tool calling · reads images

Poe ↗

ByteDance

Seed 1.6

$2.75/M tokens

OpenRouter list price, nothing below it is accounted for · $0.27 per 1,000 pages

262k context · tool calling · reads images

List price in (lower wins)

$0.25/M

List price out (lower wins)

$2/M

Cheapest we can explain (lower wins)

$2.46/M at Poe

none below list

Standard price (lower wins)

$2.75/M

Cost per 1,000 pages (lower wins)

$0.24

$0.27

Context

400k tokens

262k tokens

Open weights

not stated

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

13 Nov 2025

23 Dec 2025

Providers selling it

Price we measure against

OpenRouter

Trains on your prompts (no is better)

not stated

no provider to check

Providers selling both · 6

Eden AI$2.75 / $2.75
Kilo Gateway$2.75 / $2.75
LLM Gateway$2.75 / $2.75
Nous Portal$2.75 / $2.75
OpenRouter$2.75 / $2.75
Vercel AI Gateway$2.75 / $2.75

GPT-5.1-Codex-Mini then Seed 1.6, per million tokens

Go further

open in the compare tool →every price for GPT-5.1-Codex-Mini every price for Seed 1.6

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

What moved in the last seven days

GPT-5.1-Codex-MiniNous Portal$0.20 / $1.60 $0.25 / $225% dearer · 16 Sept 2026
Seed 1.6Nous Portal$0.20 / $1.60 $0.25 / $225% dearer · 16 Sept 2026

Frequently asked

Which is cheaper, GPT-5.1-Codex-Mini or Seed 1.6?: GPT-5.1-Codex-Mini, at $2.46 per million tokens against $2.75 for Seed 1.6, three parts input to one part output, read on 16 Sept 2026.
Where is each one cheapest?: GPT-5.1-Codex-Mini: $2.46 at Poe. Seed 1.6: nobody goes below OpenRouter's own price with a reason we can point at, so $2.75 is the number to beat.
Can I buy both from one provider?: Yes. 6 providers sell both: Eden AI, Kilo Gateway, LLM Gateway, Nous Portal, OpenRouter, Vercel AI Gateway. The cheapest of them for the two together is Eden AI.
Which holds more context?: GPT-5.1-Codex-Mini, at 400k tokens against 262k.

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.