open source autonomous coding agents Opencode Cline OpenClaude OpenCodex

 so anyone already made something like antigravity that can be used with any models or open source models..???

Yes, absolutely. You do not need to wait for Google or Anthropic. The developer community has built incredibly powerful, 100% open-source, model-agnostic coding agents that do the exact same thing as Google Antigravity and Claude Code.

These open-source tools allow you to bring your own API keys (Gemini, OpenAI, Anthropic, DeepSeek) or run completely free local open-source models (like Llama 3 or DeepSeek-Coder via Ollama). [1, 2, 3]

The most popular open-source, terminal-first, and editor-integrated coding agents include:

1. OpenCode (The Most Popular Pick)

OpenCode is currently one of the leading open-source alternatives. It provides a full developer agent loop that can read files, write code, run terminal commands, and debug errors automatically. [1, 2, 3]

• Model Flexibility: It supports over 75+ LLM providers. You can plug in Gemini, ChatGPT, or your own local models via Ollama.
• Interface: It functions as a terminal CLI tool, a desktop app, or an extension for major IDEs like JetBrains.
• Cost: It is entirely free to use; you only pay the baseline cost of the raw API tokens you consume. [1, 2]

2. Cline (The Swiss Army Knife)

Originally built as a highly autonomous VS Code extension, Cline has grown into a massive open-source agent runtime that supports multi-file edits, terminal execution, and a dedicated CLI. [1, 2]

• How it handles loops: Cline will create a software plan, read your repository files, execute a bash script, look at the error log, and self-correct—asking for your permission only when it runs a terminal command.
• Model Flexibility: It natively supports custom API endpoints, OpenRouter, DeepSeek, Google Vertex AI, and local offline models. [1]

3. OpenClaude & OpenCodex (Direct Framework Clones)

If you like the specific terminal layout and slash-command workflow of the big tech agents but want to swap the models:

• OpenClaude: An open-source project that takes the visual style and terminal interface of Claude Code but breaks it out of the Anthropic ecosystem. It lets you run the same workflows using OpenAI, Gemini, or a local model with a simple /provider command. [1]
• OpenCodex / OpenAI Codex CLI: OpenAI’s open-source terminal agent that provides a sandboxed environment for your code loops. Using proxies like OpenCodex, you can point this official framework toward any model you want. [1]

4. Pi (Minimal & Token-Efficient)

For developers who find massive multi-agent systems bloated and expensive, Pi is a lean, text-only terminal agent built on a "less is more" philosophy. It handles the agentic loop cleanly, supports 15+ API providers, preserves history tree structures so you can roll back code changes, and is highly optimized to not waste token costs. [1, 2]

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How to use them for free with Open-Source Models

If your goal is to reduce your costs to exactly $0.00, you can pair any of these tools with a local LLM runner:

1. Download Ollama onto your machine.
2. Run a highly capable coding model locally in your terminal:
   bash

   ollama run deepseek-coder-v2  # Or llama3.1
   

   Use code with caution.
3. Install an agent like Cline or OpenCode and set the provider setting to Ollama pointing to localhost:11434. [1, 2]

Your local model will now act as the engine, and the open-source framework will handle the heavy lifting of reading files, writing diffs, and testing the code—giving you a private, free "Antigravity" clone. [1, 2]

Would you prefer to install a terminal-first CLI tool like OpenCode/OpenClaude, or would you rather use an IDE extension like Cline inside VS Code? Let me know and I can give you the exact installation steps.