Free AI Coding Agents in 2026: OpenCode, Freebuff and Others

⚡ The gist in 5 seconds - Free AI coding agents in 2026 are not just a couple of queries — they are full-fledged tiers, open-source tools, and free models from OpenCode, Freebuff, and other services. - As of publication (September 25, 2026), the review on Habr lists 10 agents: OpenCode, Freebuff, CodeGPT, Cline, TRAE, ZCode, OpenAI Codex, Kilo Code, Cursor, and Google Antigravity. - Key caveat: a "free agent" does not mean "free models" — limits, quotas, and feature availability change quickly. ### 🔍 What was found Author MihaDeev published a breakdown of 10 AI coding agents on Habr. He emphasizes the importance of distinguishing between the cost of the agent itself, the free models available, the free tier limits, and the ability to plug in your own API or a local model. The table shows that CodeGPT's free tier offers 10 interactions/day on Economy plus $1 welcome credit, ZCode has a 5-day trial, Cursor Hobby has limited Agent requests, and Google Antigravity has Basic weekly rate limits. OpenCode and Freebuff are covered separately. OpenCode is an open-source agent that is free in itself. In the OpenCode Zen catalog, models priced at $0 appear from time to time: for example, MiMo-V2.5 Free, Ling 3.0 Flash Fin Free, Nemotron 3 Ultra Free, Nemotron 3.5 Lightning Free, Big Pickle, and Muse Spark 1.3 Contributor Free. There is no single free quota — limits depend on the specific model and may change. In Full mode, Freebuff issues 100 Freebucks daily, which can be spent on one of the models: GLM 5.3 Flash (up to 20 hours), Solar Mini 4 (up to 20 hours), MiMo 2.6 Flash (up to 10 hours), DeepSeek V4.1 Flash (up to 6 hours), or Muse Spark 1.2 (up to 6 hours). Important: the hours do not stack — these are options for spending a single daily quota. ### 💡 Why it matters Until recently, a good AI coding agent almost always meant a paid subscription. Now there are many tools that can be used for free: some provide free models themselves, some allow you to connect your own API keys or local models, and some offer a small free tier. This means free agents can be seriously used in real work, not just for one-off experiments. ### 🧩 Context The data in the article is current as of September 25, 2026. Prices, models, free quotas, and feature availability of AI services change very quickly, so the author records the state exactly as of the publication date. The review also notes that a "free agent" ≠ "free models": for example, Cline is free as open source but requires your own API key or local models. Freebuff uses an ad-based model to cover inference costs, so it has separate Full and Limited modes (in some regions, such as the Czech Republic, Full may be unavailable, in which case Limited is available with DeepSeek V4 Flash and 6 sessions of 1 hour/day each).

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