codemass

⚖️ Weigh your code in tokens - calculate AI API costs for your codebase before feeding it to LLMs.

Features

• 🔢 Universal token counting - Counts tokens in ALL text files
• 💰 Multi-model cost estimation - Support for 10+ LLM models with current pricing
• 🚫 Smart exclusions - Respects .gitignore and skips binary files
• 📊 Detailed breakdown - See token distribution by file type
• 🎯 Flexible filtering - Exclude specific file types or patterns

Installation

npx codemass

Or install globally:

npm install -g codemass

Usage

# Analyze current directory
npx codemass

# Analyze specific directory
npx codemass ./src

# Choose pricing model (default: sonnet-4)
npx codemass --model gpt-5

# Exclude file types
npx codemass --no-json --no-yaml
npx codemass --exclude .test.js,.spec.ts

# List available models
npx codemass --list-models

Options

• --model <id> - Choose LLM model for pricing (default: sonnet-4)
• --list-models - Show all available models with pricing
• --exclude <exts> - Exclude specific extensions (comma-separated)
• --no-json - Exclude JSON files
• --no-markdown - Exclude Markdown files
• --no-yaml - Exclude YAML files

Supported Models

Model	Input $/1M	Output $/1M
Claude Opus 4	$15.00	$75.00
Claude Sonnet 4 (default)	$3.00	$15.00
Gemini 2.5 Pro	$1.25	$10.00
GPT-5	$1.25	$10.00
Gemini 2.5 Flash	$0.30	$2.50
GPT-5 mini	$0.25	$2.00
Gemini 2.5 Flash-Lite	$0.10	$0.40
GPT-5 nano	$0.05	$0.40

How It Works

1. Scans all text files in your project (respecting .gitignore)
2. Counts tokens using OpenAI's o200k_base tokenizer
3. Calculates costs based on selected model pricing
4. Shows breakdown by file type and largest files

Example Output

⚖️  Weighing: /path/to/project

================================================================================
CODEMASS ANALYSIS
================================================================================
Total Files: 142
Total Tokens: 285,431 (o200k_base tokenizer)
Total Size: 1.23 MB
Average Tokens/File: 2,010

BY FILE TYPE:
----------------------------------------
.ts        156,234 tokens (54.7%) - 89 files
.tsx        98,456 tokens (34.5%) - 42 files
.css        30,741 tokens (10.8%) - 11 files

TOP 20 FILES BY TOKEN COUNT:
--------------------------------------------------------------------------------
    Tokens        Size    Path
--------------------------------------------------------------------------------
     5,234      23.4 KB    src/components/Dashboard.tsx
     4,892      21.2 KB    src/utils/parser.ts
     ...

================================================================================
COST ESTIMATION (Claude Sonnet 4):
Input:  ~$0.86 ($3/1M tokens)
Output: ~$4.28 ($15/1M tokens)
Total:  ~$5.14 (if output = input size)
================================================================================

Notes

• Token counts use OpenAI's o200k_base tokenizer
• For non-OpenAI models, token counts are estimates and may vary slightly
• Binary files are automatically detected and skipped
• Always respects .gitignore patterns

License

MIT