Union Alpha is the former stealth name for Pareto 26.9, a multi-model AI service from Circuit & Chisel, offered through the Unbiased platform. Its free preview has ended, and the model is now available as a paid API under the identifier unbiased/pareto. Pricing is $2.50 per million input tokens, $7.50 per million output tokens, and $0.25 per million cached input tokens. Pareto 26.9 supports text and image input, tool calling, a 262,144-token context window, and up to 131,072 output tokens.

Rather than relying on a newly trained foundation model, Pareto coordinates existing models, evaluates and synthesizes their work, and can call on stronger models when needed. The site presents official release scores alongside independent benchmark results, including coding, reasoning, mathematics, and tool-use tests, while clearly distinguishing preview findings from paid-endpoint measurements. It also features custom SVG examples generated from prompts. Union Alpha’s related showcase includes Demodokos Foundry, a local-PC creative workspace for producing scenes with AI-generated music, expressive voices, translation, and subtitles.