OpenSpec

OpenSpec

Fission AI
OpenCode

OpenCode

Anomaly Innovations
+
+

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About

OpenSpec is an open-source spec-driven development framework designed to bring structure and clarity to AI-assisted coding workflows. It introduces a lightweight specification layer that helps teams define requirements before writing code. The platform organizes each change into structured artifacts such as proposals, specifications, designs, and task lists. It integrates with over 20 AI coding tools, allowing developers to use their preferred assistants while maintaining consistency. OpenSpec emphasizes an iterative and flexible approach rather than rigid development phases. Its command-based workflow enables users to propose, implement, and archive features efficiently. Overall, OpenSpec helps developers align with AI systems, reduce ambiguity, and produce more predictable and reliable outcomes.

About

OpenCode is the AI coding agent purpose-built for the terminal. It delivers a responsive, themeable terminal UI that feels native while streamlining your workflow. With LSP auto-loading, it ensures the right language servers are always available for accurate, context-aware coding support. Developers can spin up multiple AI agents in parallel sessions on the same project, maximizing productivity. Shareable links make it easy to reference, debug, or collaborate across sessions. Supporting Claude Pro and 75+ LLM providers via Models.dev, OpenCode gives you full freedom to choose your coding companion.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers, product teams, and organizations using AI coding assistants who want a structured, spec-driven approach to improve clarity, collaboration, and development outcomes

Audience

OpenCode is built for developers who want an AI coding agent that’s fast, collaborative, and native to the terminal

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 4.5 / 5
support 4.5 / 5

Pros & Cons from Real Users

Pros

  • OpenCode feels like a strong fit for developers who want an AI coding agent without getting locked into one model or one editor. I like that it works in the terminal, desktop, and IDE, so it can fit into different workflows instead of forcing one setup. The model flexibility is a big win. Being able to use 75+ providers, local models, GitHub Copilot, or ChatGPT Plus/Pro makes OpenCode feel more open and customizable than a lot of coding assistants. I also like the LSP support and multi-session workflow. For real coding work, it helps when the agent understands the project better and can run multiple threads of work in parallel.
  • Easy to install Easy to use Free models available with nearly no limits New models commonly get added for free

Cons

  • OpenCode is still something I would supervise closely. Any coding agent that can modify files, reason through projects, and run workflows needs clear review, tests, and good developer judgment.
  • CLI only

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Fission AI
openspec.dev/

Company Information

Anomaly Innovations
Founded: 2008
United States
opencode.ai/

Alternatives

Claude Code

Claude Code

Anthropic

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Kiro

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Hermes Agent

Hermes Agent

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Zenflow

Zenflow

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Intent

Intent

Augment Code
Claude Code

Claude Code

Anthropic

Categories

Agentic AI Supported
AI Coding Agents Supported

Categories

Integrations

Claude Code Supported
Cursor Supported
Devin Desktop Supported
GitHub Copilot Supported
ADE Not Supported
AUTOMATER.ai Not Supported
Claude Pro Not Supported
GPT-5.1 Thinking Not Supported
GPT-5.6 Sol Ultrafast Not Supported
Gemma 3 Not Supported
Google Antigravity Supported
Kilo Code Supported
Kimi K2.6 Not Supported
OpenViking Not Supported
Preloop Not Supported
Spawn Not Supported
SuperBased Not Supported
Tencent Hy Not Supported
Visual Studio Code Not Supported

Integrations

Claude Code Supported
Cursor Supported
Devin Desktop Supported
GitHub Copilot Supported
ADE Supported
AUTOMATER.ai Supported
Claude Pro Supported
GPT-5.1 Thinking Supported
GPT-5.6 Sol Ultrafast Supported
Gemma 3 Supported
Google Antigravity Not Supported
Kilo Code Not Supported
Kimi K2.6 Supported
OpenViking Supported
Preloop Supported
Spawn Supported
SuperBased Supported
Tencent Hy Supported
Visual Studio Code Supported
Claim OpenSpec and update features and information
Claim OpenSpec and update features and information
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Claim OpenCode and update features and information