GPT-5 through the API

GPT-5 is the flagship of OpenAI: the best reasoning and coding model in the offering, with a 400k token context window. Alongside the full model there are mini and nano variants for those who need less and consume a lot. Here are the rates and the practical side of using it from the EU.

Rates per million tokens

GPT-5 costs $1.25 per million input tokens and $10 per million output tokens. The mini variant costs $0.25 / $2, and the nano variant $0.05 / $0.40. Context window is 400k tokens for all three. For many production tasks the mini variant is the sweet spot: same family, a fifth of the price.

When GPT-5, when mini or nano

GPT-5 (full) for complex reasoning, agentic tasks and hard code. GPT-5 mini for routine generation, summarisation and classification with high demands. GPT-5 nano for bulk tasks: tags, extraction, simple routing. Teams that set this up well often pay 5-10x less per task package than teams that run everything on the big model.

Using GPT-5 from the EU

Directly with OpenAI: contract under US law, dollar invoicing, and an EU story you justify yourself. Through an EU intermediary like Gatewaybird (from launch): the same model, but with a Dutch contract, euro invoice and an EU processor in your records. The API call stays identical — OpenAI-compatible schema.

Alternatives at the same level

At the frontier level, Claude Opus/Sonnet (strong in code and writing), Gemini 2.5 Pro (long context window, multimodal) and Grok 4 compete. The price comparison puts them side by side on input and output price, so you can choose per use case.

Prijsvergelijker →OpenAI API vanuit de EU →

Frequently asked questions

What does GPT-5 cost per million tokens?

$1.25 per million input tokens and $10 per million output tokens (standard rate). The mini variant costs $0.25/$2 and the nano variant $0.05/$0.40 per million.

How large is the context window of GPT-5?

400,000 tokens for full GPT-5, as well as mini and nano. That is roughly a 300,000-word book.

Can I get GPT-5 invoiced in euros?

Directly, OpenAI invoices in dollars. Through an EU intermediary like Gatewaybird you get a euro invoice with Dutch VAT — after launch, for waitlist members.

Can GPT-5 be used through the OpenAI-compatible schema of Gatewaybird?

Yes: the Gatewaybird endpoint speaks the same schema, so your existing OpenAI client works with a different base URL and key.

Compare GPT-5 with other models

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