September 16, 2026
Free model for AI agents arrives in OpenRouter: Union Alpha supports 256K context
Union Alpha is presented as a free multimodal model with 256K context in OpenRouter and OpenCode (Sep 16, 2026). It can call tools and is designed for research, programming, and AI-agent workflows. OpenCode Data recorded 9 users, 19 completed sessions, 104 tokens, and $0.00 in spending as of the same date.
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🥷 New stealth model: Union Alpha (@unionalphaai) A multimodal model for research, coding, and AI agent workflows. - Free - 256K context - Tool calling - Capabilities for any task, on par with the smartest models Try it now and share your feedback: https://openrouter.ai/stealth/union-alpha
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Previously, in OpenCode via OpenRouter, users selected a model after the `/connect` command, entering an API key, and the `/models` command. Now Union Alpha has appeared in the same setup. For the direct OpenRouter API, the model is specified in the `model` field at `/api/v1/chat/completions`, while the key is passed as a Bearer token. OpenRouter links to a dedicated Union Alpha page for a trial run.
Union Alpha is available for a trial run on a dedicated OpenRouter page and for connection to OpenCode.