Breaking

Union Alpha Debuts as a Free Stealth Model for Coding Agents on OpenRouter and OpenCode

September 16, 2026 at 13:24 EDT

Foundation Models
AI Agents
Software Dev & Coding

Union Alpha, a new anonymous multimodal AI model, went live on OpenRouter on September 16, 2026, with free pricing and positioning around research, coding, and agentic workflows. The model is also being surfaced through OpenCode, where early users can run coding-agent workloads at no cost during an initial promotional window.

Sep 16, 2026 · Union Alpha

A free stealth model for coding agents

Union Alpha launched with free pricing, multimodal input, and a 262K-token context window, while its provider remains unnamed during preview.

262K

token context window

131K

maximum completion tokens

Free

input and output pricing

17 tps

reported throughput

Traffic concentrates in coding-agent tools

1.06Bomp

374MCline

351MHermes Agent

226MZCode

200MDeepSeek Harness

Each stack is scaled to reported token volume, with the largest early user set as the tallest column.

Why developers try it

Free access, long context, image input, function calling, and coding-agent positioning make it useful for experiments and automated software tasks.

Why teams stay cautious

The provider is unnamed, prompts and completions may be retained, availability varies, and JSON-schema enforcement is not supported.

Preview pattern

Anonymous launch→Agent testing→Public feedback→Possible reveal

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