Which is cheaper, GPT-5.5 Pro or o1-pro?

GPT-5.5 Pro, at $245.50 per million tokens against $954.50 for o1-pro, three parts input to one part output, read on 16 Sept 2026.

Where is each one cheapest?

GPT-5.5 Pro: $245.50 at Poe. o1-pro: $954.50 at Poe.

Can I buy both from one provider?

Yes. 6 providers sell both: Poe, Eden AI, Kilo Gateway, OpenAI, OpenRouter, TrustedRouter. The cheapest of them for the two together is Poe.

Which holds more context?

GPT-5.5 Pro, at 1.1M tokens against 200k.

GPT-5.5 Pro vs o1-pro.

model vs model · prices as of 16 Sept 2026

GPT-5.5 Pro takes 5 of 5 rounds against o1-pro. It is also the cheaper of the two to run, at $245.50 per million tokens against $954.50.

OpenAIwins 5 rounds

GPT-5.5 Pro

$245.50/M tokens

cheapest we can explain, at Poe · $26.18 per 1,000 pages

1.1M context · tool calling · reads images

Poe ↗

OpenAI

o1-pro

$954.50/M tokens

cheapest we can explain, at Poe · $114.55 per 1,000 pages

200k context · tool calling · reads images

Poe ↗

List price in (lower wins)

$30/M

$150/M

List price out (lower wins)

$180/M

$600/M

Cheapest we can explain (lower wins)

$245.50/M at Poe

$954.50/M at Poe

Standard price (lower wins)

$270/M

$1,050/M

Cost per 1,000 pages (lower wins)

$26.18

$114.55

Context

1.1M tokens

200k tokens

Open weights

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

23 Apr 2026

19 Mar 2025

Providers selling it

Price we measure against

the maker's own

Trains on your prompts (no is better)

not stated

Providers selling both · 6

Poe$245.50 / $954.50
Eden AI$270 / $1,050
Kilo Gateway$270 / $1,050
OpenAI$270 / $1,050
OpenRouter$270 / $1,050
TrustedRouter$284.90 / $1,108

GPT-5.5 Pro then o1-pro, per million tokens

Go further

open in the compare tool →every price for GPT-5.5 Pro every price for o1-pro

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

What moved in the last seven days

GPT-5.5 ProNous Portal$24 / $144 $30 / $18025% dearer · 16 Sept 2026

Frequently asked

Which is cheaper, GPT-5.5 Pro or o1-pro?: GPT-5.5 Pro, at $245.50 per million tokens against $954.50 for o1-pro, three parts input to one part output, read on 16 Sept 2026.
Where is each one cheapest?: GPT-5.5 Pro: $245.50 at Poe. o1-pro: $954.50 at Poe.
Can I buy both from one provider?: Yes. 6 providers sell both: Poe, Eden AI, Kilo Gateway, OpenAI, OpenRouter, TrustedRouter. The cheapest of them for the two together is Poe.
Which holds more context?: GPT-5.5 Pro, at 1.1M tokens against 200k.

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.