OpenRouter Launches Free Stealth Multimodal Model 'Union Alpha'

OpenRouter ·

Key Info

OpenRouter has launched a new free "stealth" multimodal model, Union Alpha, designed for research, coding, and agentic workflows, with 256K context and tool calling. It reportedly delivers frontier-level general-purpose performance, and the provider does not train on user prompts or completions.

Highlights

  • Available now on OpenRouter and works in every harness via the unified API, e.g. --model=stealth/union-alpha.
  • Free to use, with 256K context and tool calling, aimed at research, coding, and agentic tasks.
  • The provider does not train on your prompts or completions.
  • Early DeepSWE results were shared, and the team is inviting community feedback.
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