GPT-5 Nano

OpenAI · Released August 2025 · Knowledge cutoff May 2024

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...

It is part of OpenAI's GPT family, where Sol, Luna and Terra mark the current generation's capability tiers and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

400K tokens

Input price

0.55 credits / 1M tokens ($0.050 raw)

Output price

4.4 credits / 1M tokens ($0.40 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

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What GPT-5 Nano is best for

• High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
• Long documents: the 400K-token window holds lengthy reports, contracts or papers whole
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a fast and light model like GPT-5 Nano:

• Summarize this article in five bullet points
• Rewrite this email to be shorter and friendlier
• Give me ten name ideas for a hiking newsletter
• Translate this paragraph to Spanish and keep the tone

OpenAI family

All 90 OpenAI models

Frequently asked questions

What is GPT-5 Nano?

GPT-5 Nano is an AI model by OpenAI. GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...

How much does GPT-5 Nano cost on Zeplik?

Input tokens cost 0.55 credits per million and output tokens 4.4 credits per million (1 credit = $0.10; the raw provider rates are $0.050 and $0.40 per million). New accounts start with free credits.

How long can a conversation with GPT-5 Nano be?

GPT-5 Nano has a 400K-token context window (400,000 tokens), which covers the conversation plus any documents you attach.

Does GPT-5 Nano support images and tools?

GPT-5 Nano accepts image input and supports tool calling.

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