A new stealth model went live on OpenCode and OpenRouter!
It currently lets users run coding agents at zero cost on both platforms, and OpenCode says the free period runs for a week.
What's known so far 👀
According to benchmarks, it performs close to Fable 5 level at a price of GPT-5.6 Terra.
The model accepts images alongside text and supports tool calling.
It handles 262K tokens of context and up to 131K tokens of output.
Prompts are kept out of model training, and OpenCode lists a zero-retention policy on its platform.
Union Alpha (stealth model) is free for the next week - no data training - built for agentic coding - supports images let's see what you can do