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Claude Sonnet 5.5 vs GPT-5.5: API price compared

On Kontinent AI, Claude Sonnet 5.5 costs $0.50 input and $2.50 output per million tokens, and GPT-5.5 costs $1.00 input and $6.00 output per million tokens. Claude Sonnet 5.5 is cheaper on both.

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Price per million tokens

Claude Sonnet 5.5 GPT-5.5
Input Official price $2.00 , Kontinent AI $0.50 Official price $5.00 , Kontinent AI $1.00
Output Official price $10.00 , Kontinent AI $2.50 Official price $30.00 , Kontinent AI $6.00
Cached input Official price $0.20 , Kontinent AI $0.05 Official price $0.50 , Kontinent AI $0.10
Multiple 4x less 5x less

USD per million tokens. The struck-through figure is the maker's official price (Anthropic, OpenAI). The figure beside it is ours.

What jobs cost on each

Job Claude Sonnet 5.5 GPT-5.5
1,000 support-bot replies Official price $8.00 , Kontinent AI $2.00 Official price $22.50 , Kontinent AI $4.50
One coding-agent session Official price $0.60 , Kontinent AI $0.15 Official price $1.60 , Kontinent AI $0.32
1,000 document summaries Official price $11.00 , Kontinent AI $2.75 Official price $29.00 , Kontinent AI $5.80

Official price struck through, ours below it. Each job is priced the way the API bills it.

Try Claude Sonnet 5.5 and GPT-5.5 with one key

Switch between them by changing the model name. Both cost a fraction of the official price, and every response shows what it cost.

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Side by side

Maker Anthropic OpenAI
Context window 200k tokens 1M tokens
Beyond plain chat Tool calling, Image input Tool calling, Structured output, Image input
Thinks before answering When asked Yes, billed as output
Speed, measured by us not measured yet not measured yet
Formats chat messages chat responses

Questions

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

On Kontinent AI, Claude Sonnet 5.5 costs $0.50 input and $2.50 output per million tokens, and GPT-5.5 costs $1.00 input and $6.00 output per million tokens. Claude Sonnet 5.5 is cheaper on both.

What does a coding-agent session cost on each?

A session of 200,000 input tokens and 20,000 output tokens, uncached, costs $0.15 with Claude Sonnet 5.5 and $0.32 with GPT-5.5 on Kontinent AI. At the official prices it costs $0.60 and $1.60.

Can I use both with one API key?

Yes. One Kontinent AI key calls every model in the catalogue. Change the model name in the request to switch.

Which one gives better answers?

This page compares price, context and formats. It does not rank answer quality, which depends on your task. Try both on your own prompts: one key calls both.

Pay a fraction of the official price

One API key for Claude, GPT, Gemini and open models. A prepaid balance, no subscription.

Get an API key Try Claude Haiku 4.5 first No top-up needed
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  • Pay only for requests that get an answer
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All comparisons