Union Alpha
Stealth preview model: OpenRouter lists stealth/union-alpha ("Union Alpha is a stealth model", added 2026-09-16, 262,144-token context, text and image input) free of charge during the preview. The developer is not disclosed, the weights are closed and the eventual price is not announced, so no cost per task is shown. Source: OpenRouter's model endpoint listing, retrieved 2026-09-16.
Top 0 cheapest providers (Adjusted $/task)
Within the active global provider, residency and confidentiality filters.
free (stealth preview) on OpenRouter — rate-limited and temporary, not a paid price; the eventual price is not announced.
Composite
0 of 7 inputs6 radar axes: DesignArena's two boards share one50.0
AA Coding —Coding Agent v1.4 —AA Intelligence —AA Agentic —Epoch ECI —Software ECI —DesignArena —/—
Radar: percentile among all models measured on each input; a gap means not measured.
Benchmark sheet
2 of 140 registered benchmark versions · bars show the percentile among all models measured on each benchmark.
Agentic
Terminal-Bench v4.0 (AA)no percentile52.0%
Terminal-Bench v4.0 (AA) v4.0 ↗ · Published board — Tests terminal-based work on the 66-task release using mini-SWE-agent v2.4.6.
Coding
DeepSWE (Datacurve, via Epoch AI)no percentile73.0%
DeepSWE (Datacurve, via Epoch AI) published 2026-09-15 ↗ · OpenRouter run, harness not stated — Pass rate of coding agents on original, long-horizon software engineering tasks, run by Datacurve with the mini-swe-agent harness.
Missing coverage · 143 benchmark versions
No result does not mean a zero, or that the model was never tested. Collection failures and disputed versions retain their distinct status.
Token offers by platform · 1 offers (Adjusted $/task)
Click any underlined price to see how it is estimated and where each input comes from. How we calculate adjusted cost.
1 offers within the active global filters; “—” means the catalog is active but no public token price is available.
OpenRouter (1)
| Stealthfree (stealth preview) — Free route: rate- and quota-limited, availability may change — not used as a paid price | globalstealth | $0 raw in $/1M | $0 raw out $/1M | not a paid price |