OpenCode is an open-source agent that helps you write code in your terminal, IDE, or desktop. Per its own site: 208,000 GitHub stars, 950 contributors, 16M developers a month. The features that matter: LSP support that automatically loads the right language servers, multi-session agents running in parallel on the same project, share links for any session, login with GitHub Copilot or ChatGPT Plus/Pro, and any model from 75+ providers through Models.dev, including local models. It does not store your code or context data.
The free-model story runs through OpenCode Zen, a gateway of handpicked models OpenCode has tested and benchmarked specifically for coding agents. The free set rotates, and since September 2026 the free models only answer inside the OpenCode app itself. The current free set includes DeepSeek V4.1 Flash, GLM-5.3 Flash, big-pickle, and Space Bunny, an anonymous stealth preview with a 1M context window.
DeepSeek V4.1 Flash has the published repo-coding numbers behind it. Space Bunny is the high-upside experiment: no official model card, no verified head-to-head benchmark, but a 1M context window, text/image/video input, and a reputation for turning wireframes and sketches into working code.
I love using OpenCode as a way of trying new models. It is super easy to switch between the newest models with one consistent setup. No new tool to learn, no new config to fight, just pick a model and go.
Now I have it linked inside of T3, and it is even easier to try the free models that keep dropping as stealth releases. A new anonymous model shows up, I point OpenCode at it through T3, and I am testing it within minutes. That loop, new model drops, try it in the same setup, keep what earns a spot, is the whole reason OpenCode is in my stack.
