Background:

llm-cost

A CLI tool to estimate LLM prompt costs using real tokenization and model pricing.

Tools

• Node.js (CLI tool)
• TypeScript
• JSON-based pricing config
• Tokenization via tokenizer library
• Cost modeling and math

Features

• Model-aware token counting (via tokenizer)
• Input + output token cost estimation
• CLI usage with output token override
• Pricing defined via JSON

Output:

Displays token counts and estimated USD cost.

Usage

npm install
npm run build
node dist/index.js gpt-4o-mini "Write a haiku about developers learning to adopt ai faster."
node dist/index.js gpt-4o-mini "Write a haiku about developers learning to adopt ai faster." --out 50