GPT-4o vs GPT-4o mini: what's the price difference?

GPT-4o costs $2.50 per 1M input tokens and $10.00 per 1M output tokens. GPT-4o mini is dramatically cheaper at $0.15/$0.60 per 1M tokens — about 16x less. For most chat or summarization tasks, GPT-4o mini delivers solid results at a fraction of the cost.

How many words is 1,000 tokens in English vs Polish?

In English, 1,000 tokens is roughly 750 words. In Polish and other Slavic languages, tokenization is less efficient — 1,000 tokens may be closer to 500–600 words due to more complex morphology. Non-Latin scripts (Chinese, Arabic) can be even denser per token.

Does context window size affect API cost?

Yes. Every token in your context window — including the full conversation history and system prompt — is counted as input tokens for each API call. A 100,000-token context window costs the full input price for every message you send while it's populated.

What is a typical API cost per user for an AI chatbot?

With GPT-4o mini, a typical back-and-forth conversation of ~2,000 tokens per exchange costs about $0.00045. At 10 exchanges per session, that's $0.0045 per user session — roughly $4.50 per 1,000 sessions. GPT-4o costs about 15x more, so plan accordingly based on your volume.

OpenAI API Cost Calculator

Calculate your OpenAI API costs across GPT-4o, GPT-4o mini, GPT-3.5-turbo, and DALL-E 3 based on token usage or image count.

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Frequently asked questions

OpenAI API Cost Calculator — GPT-4o, GPT-4o Mini & DALL-E 3 Pricing

OpenAI charges per token for text models and per image for DALL-E 3. Costs vary significantly between models: GPT-4o mini is roughly 16x cheaper than GPT-4o, making model selection critical for production apps. This calculator estimates your monthly API spend based on token volume or image count so you can budget accurately before scaling.

All major models

Supports GPT-4o, GPT-4o mini, GPT-3.5-turbo, and DALL-E 3 pricing in one tool.

Input/output split

Automatically splits tokens into a 1:2 input-to-output ratio to reflect real usage patterns.

Instant cost estimate

Enter your token volume in thousands and see the total API cost immediately — no spreadsheet required.

When building production AI features, always benchmark token usage on realistic user sessions before setting pricing. Even small per-token costs compound rapidly at scale.