stealth Union Alpha

Union Alpha by stealth excels in the Coding category, where it ranks #423 with a composite score of 19/100. 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 particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

Union Alpha is priced at $0.00 per million input tokens and $0.00 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, Union Alpha holds rank #423 out of 425 models tracked. Its quality rank is #423 and adoption rank is #423. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

Union Alpha has been evaluated across 6 different signals. Its strongest areas include Capabilities (67/100), Benchmarks (17/100), Pricing (100/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 19/100 reflects a weighted combination of all tracked signals.

Union Alpha is available as a free, open-source model. You can run it locally or use it through various hosting providers. Some API providers may charge for hosted inference, so check individual provider pricing.

Union Alpha supports a 262K token context window (262,144 tokens total). That translates to roughly 196,608 words in a single prompt. This is large enough to process entire codebases, research papers, or long conversation histories in one shot.

Union Alpha can generate up to 131K output tokens (131,072 tokens) per response. That is roughly 98,304 words. This is enough for generating complete code files, detailed reports, or long-form content in a single response.

Union Alpha supports image understanding (vision), function/tool calling, structured JSON output, streaming responses. Function calling lets you integrate it with external APIs and tools programmatically. Vision support means it can analyze images, screenshots, and diagrams alongside text. These capabilities determine which workflows and integrations the model can handle natively.

Union Alpha was developed by stealth. It was released on September 16, 2026. You can access it through stealth's API. Check our provider page for all models from stealth and how they compare against each other.

Pick Union Alpha when you need a budget-friendly option for high-volume, simpler tasks where you prioritize cost over peak performance. If your task is straightforward text completion or classification, a cheaper model might give you 90% of the quality at a fraction of the price. Run a quick benchmark on your actual use case before committing.

You can access Union Alpha through stealth's API using standard HTTP requests or their official SDK. Most providers support OpenAI-compatible endpoints, so switching between models often requires changing just the model name in your API call. Streaming is supported for real-time token-by-token output. For production use, implement proper error handling, rate limiting, and cost monitoring.