Union Alpha

Image input Text input Text output
Author's Description

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....

Key Specifications
Cost
$
Context
262K
Released
Sep 16, 2026
Speed
Ability
Reliability
Supported Parameters

This model supports the following parameters:

Top P Max Tokens Temperature Tool Choice Response Format Tools
Features

This model supports the following features:

Tools Response Format
Performance Summary

Union Alpha, a stealth multimodal model created on September 16, 2026, demonstrates a strong performance profile, particularly in reliability and accuracy for specific tasks. With a context length of 262144, it is designed for research, coding, and agentic workflows. The model exhibits exceptional reliability, achieving a 100% success rate across two benchmarks, indicating it consistently provides usable responses without technical failures. While its speed ranking places it in the 11th percentile, suggesting longer response times compared to other models, its accuracy in critical areas is noteworthy. Union Alpha achieved perfect accuracy (100%) in the Hallucinations (Baseline) benchmark, effectively acknowledging uncertainty for fictional concepts. This performance is particularly impressive given its relatively fast duration for this specific test, making it the most accurate among models of comparable speed. In complex Reasoning (Baseline) tasks, the model scored 98.0% accuracy, placing it in the 90th percentile, showcasing strong capabilities in logic puzzles, pattern recognition, and abstract problem-solving, despite a longer processing duration. Price data is currently unavailable, suggesting potential free tier usage.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $0
Completion $0

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
Stealth
Stealth | stealth/union-alpha 262K $0 / 1M tokens $0 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Strategy Free Executions Accuracy Cost Duration
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