Union Alpha on OpenRouter: Tests and Reviews

A post lists a guessed breakdown for Pareto 26.9: Llama 3.3 70B and Qwen 3.6 for easy tasks, GLM 5.3 Flash for coding, DeepSeek V4 Flash as judge, and GPT 6 Astra for hard tasks.

On a real task with 2 repos and 105 planted bugs, Pareto scored 30.7 for $4.81, beating GPT-6 Astra, Opus 5 and others on cost-efficiency, and the author says it is a composite model.

The account says it previously identified 0x Alpha as GLM-5.3 and now fingerprints Union Alpha as Pareto 26.9, linking to its public model fingerprinting notes.

A tester finds Union Alpha's output better than expected, though generation is slow and timed out once; Cloudflare describes it as a MoA architecture.

Given one four-line prompt and a painting image, Union Alpha, DeepSeek v4.1 Flash and Muse Spark 1.3 each wrote one HTML file blind; Union Alpha was free and produced the most animated code but took 29 minutes.

The same prompts were run zero-shot on four demos, a lighthouse website, creepy carnival, demake and zombie defense, and the author says Union Alpha wins clearly and by a wide margin.

A side-by-side test shows Union Alpha completing the same task with less than a third of the tokens used by GPT-6 Astra and in under half the time.

On the same prompt, M3 cost $0.4 and finished in 12 minutes while Union Alpha was free and finished in 8 minutes; the author calls M3 the clear winner but sees potential in Union Alpha.

An AI daily digest reports that the unidentified stealth model Union Alpha scored 74% on DeepSWE, beat GPT-5.6 Sol on Terminal-Bench 2.1, and is free on OpenRouter with 256K context.

With the same prompt, direct API calls, high thinking and no harness, the author says Union Alpha's single-HTML Three.js floating island is clearly better than DeepSeek V4.1 Flash on water, atmosphere and extra details.

After running the pelican test several times in one afternoon, the user says results ranged from near GPT-6 Astra to unusable, and complains about frequent OpenCode failures and retries.

After running the pelican test several times with mixed results, the user doubts Artificial Analysis's rating of Union Alpha as comparable to Astra.