This stealth model is developed and operated by a third-party model provider. Prompts and completions for this model may retained by the provider but are not used for training; all other use is governed by Stealth Model TermsOpens in new tab
Union Alpha is a multimodal model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks.
Union Alpha is a stealth model. It is developed and operated by a third-party provider who has chosen to remain anonymous during this preview. OpenRouter routes requests to it and is not its developer, owner, or provider. Prompts and completions may be retained by the provider but are not used for training; all other use is governed by the [Stealth Model TermsOpens in new tab](https://openrouter.ai/terms/stealth)
Modalities
Price
Free
Context
262K
Released
Sep 16, 2026
| | Free | Free | 29.62s | 19 tps | |
Throughput
19tok/s
P50, best across providers
Latency
29.62s
P50, best provider
100.00%
98.12%
When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.
source & further reading
openrouter.ai — original article