sumcap

Summarize YouTube videos via AI — watches them so you don't have to.

Supports DeepSeek, OpenAI (ChatGPT), Google Gemini, and Anthropic Claude.

Install

go install github.com/xy3/sumcap@latest

Requires Go 1.25+.

Usage

Set at least one API key and run:

# DeepSeek
export DEEPSEEK_API_KEY="sk-..."
sumcap "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

# OpenAI
export OPENAI_API_KEY="sk-..."
sumcap "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

# Gemini
export GEMINI_API_KEY="..."
sumcap "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

# Claude
export ANTHROPIC_API_KEY="sk-ant-..."
sumcap "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

If multiple API keys are set, the first one found is used (DeepSeek → OpenAI → Gemini → Claude). Use -p to pick explicitly:

sumcap -p claude "https://www.youtube.com/watch?v=dQw4w9WgXcQ"

Flags:

Flag	Description
-f, --force	Ignore cache, re-summarize
-l N, --length N	Cap summary at ~N words
-p, --provider	Pick provider: deepseek, openai, gemini, or claude

Cached to ~/.cache/sumcap/ (provider-specific when not DeepSeek).

Providers

Provider	Env var	Model
DeepSeek	DEEPSEEK_API_KEY	deepseek-chat
OpenAI	OPENAI_API_KEY	gpt-4o
Gemini	GEMINI_API_KEY	gemini-2.5-flash
Claude	ANTHROPIC_API_KEY	claude-sonnet-4-20250514