Which is cheaper, Claude Sonnet 5.5 or GPT-6 Sol?

Neither: both run at $16 per million tokens, blended 3 in : 1 out, read on 29 Sept 2026.

Where is each one cheapest?

Claude Sonnet 5.5: nobody sells it below the maker's own price with a stated reason, so $16 is the number to beat. GPT-6 Sol: nobody sells it below the maker's own price with a stated reason, so $16 is the number to beat.

Can I buy both from one provider?

Yes. 20 providers sell both: NanoGPT, Azure AI Foundry, Azure Cognitive Services, FastRouter, GitHub Copilot, Jiekou, and more. The cheapest of them for the two together is NanoGPT.

Which holds more context?

GPT-6 Sol, at 1.1M tokens against 1M.

Claude Sonnet 5.5 vs GPT-6 Sol

Prices checked 29 Sept

GPT-6 Sol takes 1 of 5 rounds against Claude Sonnet 5.5. Both cost $16 per million tokens to run.

Anthropic

Claude Sonnet 5.5

1M context · tool calling · reads images

$16/M tokens

Anthropic's own price · $1.80 per 1,000 pages

OpenAIWins 1 round

GPT-6 Sol

1.1M context · tool calling · reads images

$16/M tokens

OpenAI's own price · $1.80 per 1,000 pages

Maker's price in (lower wins)

$2/M

Maker's price out (lower wins)

$10/M

Cheapest price (lower wins)

none below the maker

Maker's price, blended (lower wins)

$16/M

Cost per 1,000 pages (lower wins)

$1.80

Context

1M tokens

1.1M tokens

Open weights

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

28 Sept 2026

22 Sept 2026

Providers selling it

Price we measure against

the maker's own

Trains on your prompts (no is better)

no provider to check

Providers selling both · 20

NanoGPT$16 / $6.20
Azure AI Foundry$16 / $16
Azure Cognitive Services$16 / $16
FastRouter$16 / $16
GitHub Copilot$16 / $16
Jiekou$16 / $16
Kilo Gateway$16 / $16
LLM Gateway$16 / $16

Claude Sonnet 5.5, then GPT-6 Sol, per million tokens; the 8 cheapest of 20.

Go further

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

Open in the compare tool →Every price for Claude Sonnet 5.5 Every price for GPT-6 Sol

What moved this week

GPT-6 Sol
Requesty · 17% cheaper · 29 Sept
$2 / $10 $2.40 / $12
GPT-6 Sol
Eden AI · 20% dearer · 24 Sept
$2.40 / $12 $2 / $10

Frequently asked

Which is cheaper, Claude Sonnet 5.5 or GPT-6 Sol?: Neither: both run at $16 per million tokens, blended 3 in : 1 out, read on 29 Sept 2026.
Where is each one cheapest?: Claude Sonnet 5.5: nobody sells it below the maker's own price with a stated reason, so $16 is the number to beat. GPT-6 Sol: nobody sells it below the maker's own price with a stated reason, so $16 is the number to beat.
Can I buy both from one provider?: Yes. 20 providers sell both: NanoGPT, Azure AI Foundry, Azure Cognitive Services, FastRouter, GitHub Copilot, Jiekou, and more. The cheapest of them for the two together is NanoGPT.
Which holds more context?: GPT-6 Sol, at 1.1M tokens against 1M.

Prices exclude tax, read 29 Sept 2026 from each provider's own catalog. They are per M tokens, blended 3 in : 1 out, and a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.

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Claude Sonnet 5 vs Claude Sonnet 5.5 Claude Sonnet 5 vs GPT-6 Sol

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