Which is cheaper, Claude Opus 5.5 or GPT-4o?

GPT-4o, at $16.63 per million tokens against $32 for Claude Opus 5.5, three parts input to one part output, read on 23 Sept 2026.

Where is each one cheapest?

Claude Opus 5.5: nobody goes below the maker's own price with a reason we can point at, so $32 is the number to beat. GPT-4o: $16.63 at Jiekou.

Can I buy both from one provider?

Yes. 3 providers sell both: Jiekou, Nous Portal, Merge Gateway. The cheapest of them for the two together is Jiekou.

Which holds more context?

Claude Opus 5.5, at 1M tokens against 128k.

Claude Opus 5.5 vs GPT-4o.

model vs model · prices as of 23 Sept 2026

GPT-4o takes 3 of 5 rounds against Claude Opus 5.5. It is also the cheaper of the two to run, at $16.63 per million tokens against $32.

Anthropic

Claude Opus 5.5

$32/M tokens

Anthropic list price, nothing below it is accounted for · $3.60 per 1,000 pages

1M context · tool calling · reads images

OpenAIwins 3 rounds

GPT-4o

$16.63/M tokens

cheapest we can explain, at Jiekou · $2.00 per 1,000 pages

128k context · tool calling · reads images

Jiekou ↗

List price in (lower wins)

$4/M

$5/M

List price out (lower wins)

$20/M

$15/M

Cheapest we can explain (lower wins)

none below list

$16.63/M at Jiekou

Standard price (lower wins)

$32/M

$30/M

Cost per 1,000 pages (lower wins)

$3.60

$2.00

Context

1M tokens

128k tokens

Open weights

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

22 Sept 2026

13 May 2024

Providers selling it

Price we measure against

the maker's own

Trains on your prompts (no is better)

no provider to check

not stated

Providers selling both · 3

Jiekou$32 / $16.63
Nous Portal$32 / $17.50
Merge Gateway$32 / $30

Claude Opus 5.5 then GPT-4o, per million tokens

Go further

open in the compare tool →every price for Claude Opus 5.5 every price for GPT-4o

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

What moved in the last seven days

GPT-4oNous Portal$2 / $8 $2.50 / $1025% dearer · 16 Sept 2026

Frequently asked

Which is cheaper, Claude Opus 5.5 or GPT-4o?: GPT-4o, at $16.63 per million tokens against $32 for Claude Opus 5.5, three parts input to one part output, read on 23 Sept 2026.
Where is each one cheapest?: Claude Opus 5.5: nobody goes below the maker's own price with a reason we can point at, so $32 is the number to beat. GPT-4o: $16.63 at Jiekou.
Can I buy both from one provider?: Yes. 3 providers sell both: Jiekou, Nous Portal, Merge Gateway. The cheapest of them for the two together is Jiekou.
Which holds more context?: Claude Opus 5.5, at 1M tokens against 128k.

Prices exclude tax and are per million tokens, read 23 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.