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AI, API, and developer tools

Data Storage Converter

Convert between bits, bytes, and every decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) unit — with the KiB-vs-KB distinction done right.

Token Calculator

Calculate the cost of using AI language models. Estimate tokens from text and compare pricing across models like GPT-5, Claude, and Gemini.

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Technology Calculators

Navigate the real costs of AI development with our free technology calculators. The LLM token calculator lets you estimate API costs for OpenAI GPT, Anthropic Claude, Google Gemini, and other major models before you run a single request — so you can budget accurately and avoid billing surprises.

Whether you're a developer prototyping an AI-powered product, a team lead forecasting monthly API spend, or a researcher analyzing language model economics, these tools translate raw token counts into concrete dollar figures instantly.

LLM API Cost Estimation

The token calculator bridges the gap between model documentation and real-world spending. Enter your expected input and output token volumes, select a model like GPT-4o or Claude Sonnet, and get an immediate cost estimate for 1,000, 100,000, or 1 million requests.

Input tokens and output tokens are priced separately by every major provider — output is typically 2 to 5 times more expensive. Understanding that split is critical when designing prompts or choosing between models for production workloads.

Understanding AI Tokens

A token is the smallest unit of text a language model processes. In English, one token equals roughly 0.75 words, or about 4 characters. Non-Latin scripts — including Japanese kanji, Arabic, Hindi Devanagari, and Korean Hangul — typically consume more tokens per word, which directly raises API costs for multilingual applications.

Knowing your token budget before building saves you from discovering mid-sprint that a feature costs ten times your estimate. Use the calculator to set realistic limits on prompt length and response size.

Comparing Models and Providers

As of 2025, the LLM pricing landscape spans from ultra-cheap open-weight models to premium frontier models. DeepSeek and Llama-based APIs can cost under $0.10 per million tokens, while GPT-4o sits around $5 per million input tokens and Claude Opus charges $15 per million. The right model depends on your accuracy requirements, latency tolerance, and budget.

Use the token calculator to run side-by-side cost comparisons across providers. A 10x difference in token price can easily translate to thousands of dollars per month at scale, making model selection one of the highest-leverage decisions in any AI product roadmap.

Frequently Asked Questions

What is a token in the context of AI and LLMs?
A token is a chunk of text — usually a word, part of a word, or punctuation mark — that a large language model processes as a single unit. OpenAI's GPT models use a tokenizer called tiktoken, where 1,000 tokens equals roughly 750 English words. Pricing for every major LLM API (OpenAI, Anthropic, Google) is calculated per token, with separate rates for input (what you send) and output (what the model generates).

How do I calculate the cost of using the ChatGPT API?
Multiply your input token count by the model's input price per million tokens, then add the output token count multiplied by the output price. For example, GPT-4o charges approximately $5.00 per million input tokens and $15.00 per million output tokens as of early 2025. Our token calculator automates this math so you can estimate costs for any prompt length and response size without doing the arithmetic manually.

Why are output tokens more expensive than input tokens?
Generating output tokens requires the model to perform a full forward pass for each token it produces, which is computationally intensive. Reading input tokens is a single parallel pass over the context. This asymmetry is reflected in pricing across virtually all providers — output tokens typically cost 2 to 5 times more than input tokens for the same model.

How many tokens does a typical ChatGPT conversation use?
A short conversational exchange (two or three turns) uses roughly 200–500 tokens. A detailed question with a thorough answer might use 1,000–3,000 tokens. Long-form document summarization or RAG (retrieval-augmented generation) pipelines can consume tens of thousands of tokens per request. The token calculator lets you set your own token counts to estimate costs at any scale.

Which LLM API is cheapest in 2025?
As of 2025, open-weight model APIs (DeepSeek, Groq-hosted Llama, Mistral) offer the lowest per-token prices — often below $0.10 per million input tokens. Among frontier proprietary models, GPT-4o Mini and Claude Haiku occupy the budget tier. The cheapest option depends on your specific task: a model that requires fewer tokens to complete a task may be more economical even at a higher per-token rate.

Does the language I write in affect my token count?
Yes, significantly. English is the most token-efficient language in most LLM tokenizers. Languages using non-Latin scripts — Arabic, Hindi, Japanese, Korean, Thai — often use 2 to 4 times as many tokens per word. Chinese is somewhat more efficient than other CJK languages but still pricier per character than English. This means multilingual applications should budget for higher token consumption than equivalent English-only workloads.