Which is cheaper, Claude Sonnet 4.5 or GPT-5.4?

GPT-5.4, at $20.45 per million tokens against $20.61 for Claude Sonnet 4.5, three parts input to one part output, read on 16 Sept 2026.

Where is each one cheapest?

Claude Sonnet 4.5: $20.61 at Poe. GPT-5.4: $20.45 at Poe.

Can I buy both from one provider?

Yes. 31 providers sell both: Poe, Jiekou, 302.AI, Abacus, Atlas Cloud, Azure AI Foundry, and more. The cheapest of them for the two together is Poe.

Which holds more context?

GPT-5.4, at 1.1M tokens against 1M.

Claude Sonnet 4.5 vs GPT-5.4.

model vs model · prices as of 16 Sept 2026

GPT-5.4 takes 4 of 5 rounds against Claude Sonnet 4.5. It is also the cheaper of the two to run, at $20.45 per million tokens against $20.61.

Anthropic

Claude Sonnet 4.5

$20.61/M tokens

cheapest we can explain, at Poe · $2.32 per 1,000 pages

1M context · tool calling · reads images

Poe ↗

OpenAIwins 4 rounds

GPT-5.4

$20.45/M tokens

cheapest we can explain, at Poe · $2.18 per 1,000 pages

1.1M context · tool calling · reads images

Poe ↗

List price in (lower wins)

$3/M

$2.50/M

List price out (lower wins)

$15/M

Cheapest we can explain (lower wins)

$20.61/M at Poe

$20.45/M at Poe

Standard price (lower wins)

$24/M

$22.50/M

Cost per 1,000 pages (lower wins)

$2.32

$2.18

Context

1M tokens

1.1M tokens

Open weights

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

29 Sept 2025

5 Mar 2026

Providers selling it

Price we measure against

the maker's own

Trains on your prompts (no is better)

not stated

Providers selling both · 31

Poe$20.61 / $20.45
Jiekou$22.80 / $21.38
302.AI$24 / $22.50
Abacus$24 / $22.50
Atlas Cloud$24 / $22.50
Azure AI Foundry$24 / $22.50
Azure Cognitive Services$24 / $22.50
Cloudflare AI Gateway$24 / $22.50

Claude Sonnet 4.5 then GPT-5.4, per million tokens · showing the 8 cheapest of 31

Go further

open in the compare tool →every price for Claude Sonnet 4.5 every price for GPT-5.4

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

What moved in the last seven days

Claude Sonnet 4.5Nous Portal$2.40 / $12 $3 / $1525% dearer · 16 Sept 2026
GPT-5.4Nous Portal$2 / $12 $2.50 / $1525% dearer · 16 Sept 2026
Claude Sonnet 4.5Requesty$3.30 / $16.50 $3 / $159% cheaper · 11 Sept 2026

Frequently asked

Which is cheaper, Claude Sonnet 4.5 or GPT-5.4?: GPT-5.4, at $20.45 per million tokens against $20.61 for Claude Sonnet 4.5, three parts input to one part output, read on 16 Sept 2026.
Where is each one cheapest?: Claude Sonnet 4.5: $20.61 at Poe. GPT-5.4: $20.45 at Poe.
Can I buy both from one provider?: Yes. 31 providers sell both: Poe, Jiekou, 302.AI, Abacus, Atlas Cloud, Azure AI Foundry, and more. The cheapest of them for the two together is Poe.
Which holds more context?: GPT-5.4, at 1.1M tokens against 1M.

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.