Mystery stealth model Union-Alpha goes free on OpenCode, built for agentic coding
gaganghotra_ · x · 2026-09-17
OpenCode has launched a stealth model codenamed Union-Alpha, free for all users for one week.
- No training on user data, per the official announcement
- Built specifically for agentic coding workflows
- Supports image inputs
- Based on the claimed chart shared by the poster, it may match Fable 5.1-level capability at pricing near the cheaper Luna tier (unverified speculation)
OpenCode is inviting users to stress-test it, hinting it could be a blind-eval preview from an unnamed lab before an official release.
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