opencode vs OpenSpec
opencode and OpenSpec share 3 technologies: Tailwind CSS, Zod, and yaml. Both are written in TypeScript.
LinkedInWhat they share and what sets them apart
anomalyco
opencode
The open source coding agent.
TypeScript224.5kRead on November 4, 2026, at commit ffe6fedWhat is opencode built with?Only in opencode
In common
Fission-AI
OpenSpec
Spec-driven development (SDD) for AI coding assistants.
TypeScript74kRead on November 5, 2026, at commit 3e4d5f0What is OpenSpec built with?Only in OpenSpec
- Inquirer
- ora
Side by side
opencodeOpenSpec
SizeLines written by people and agents, without generated ones; code files, without tests.
opencode1,028,811 lines written3,839 code files
OpenSpec144,693 lines written218 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
opencode0.3% of its commits signed by AIWith Claude Code, GitHub Copilot, Cursor, and Jules
OpenSpec28.9% of its commits signed by AIWith Claude Code, Codex, CodeRabbit, Cursor, Mistral Vibe, GitHub Copilot, Qwen Code, and Crush
ActivityFrom GitHub and its history, on the day SeeRepo read it.
opencodeLast push November 4, 202621,835 commits224,454 stars
OpenSpecLast push November 4, 2026967 commits73,952 stars
TestsThe files that test the code, and the share of code files a test imports.
opencode1,608 test files35.1% of its code files have a test that imports them
OpenSpec245 test files74.3% of its code files have a test that imports them
Frequently asked questions
Which is bigger, opencode or OpenSpec?
opencode, with 1,028,811 lines written; OpenSpec has 144,693.
The proof: anomalyco/opencode's code at commit ffe6fed
Which has more GitHub stars, opencode or OpenSpec?
opencode, with 224,454 stars; OpenSpec has 73,952.
The proof: anomalyco/opencode on GitHub
Which has more tests, opencode or OpenSpec?
opencode, with 1,608 test files; OpenSpec has 245.
The proof: anomalyco/opencode's code at commit ffe6fed
Which was updated more recently, opencode or OpenSpec?
Both got their last push on November 4, 2026.
The proof: Fission-AI/OpenSpec's commits on GitHub
Which has more commits signed by AI, opencode or OpenSpec?
OpenSpec: an AI signed 28.9% of its commits, with Claude Code, Codex, CodeRabbit, Cursor, Mistral Vibe, GitHub Copilot, Qwen Code, and Crush; in opencode, 0.3%.
The proof: the commits each tool signed in Fission-AI/OpenSpec
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