{"slug": "multiple-providers-offer-free-mystery-model-union-alpha", "title": "Multiple providers offer free mystery model, Union Alpha", "summary": "A stealth model called Union Alpha appeared on OpenCode on 2026-09-16 as a free one-week preview under the model id opencode-go/union-alpha, and the same day on OrcaRouter as a free OpenAI-compatible endpoint, with no vendor, checkpoint, parameter count, or context window published. Community fingerprinting run by Pliny the Liberator and others found 21/21 image-bearing probes matching GLM-5.3 Flash prompt-token counts after a constant -17 offset, with gMASK and </think> markers adding +2 tokens in both Union Alpha and the GLM control, though the exact checkpoint and operator remain unconfirmed. Artificial Analysis measured Union Alpha at around 53% on Terminal-Bench v4.0 at an anticipated per-task cost near $2.50, above GLM-5.3 (max) and level with GPT-6 Astra (high) on the same chart.", "body_md": "# Union Alpha\n\nMoE workstation\n**Stealth model, operator anonymous.** Union Alpha appeared on OpenCode on 2026-09-16 as a free one-week preview (“Union Alpha Free”, model id `opencode-go/union-alpha`) and the same day on OrcaRouter as a free OpenAI-compatible endpoint. OpenCode’s copy: built for agentic coding, supports images, no training on user data, capacity “5T tokens a day so far, potentially can go up”. Asked directly, the model answers that the maker is anonymous and it is a stealth model. No vendor, checkpoint, parameter count, or context window is published.\n\n- \n**The GLM hypothesis:** community fingerprinting (run by Pliny the Liberator and others) found 21/21 image-bearing probes matching GLM-5.3 Flash prompt-token counts after a constant -17 offset, and`gMASK` /`</think>` markers adding +2 tokens in both Union and the GLM control. That is strong GLM-compatible tokenizer evidence, but the exact checkpoint and operator remain unconfirmed - GLM-5.4 is a plausible hypothesis, not an established identity. This card therefore carries no developer attribution.\n- \n**Measured performance:** Artificial Analysis pegs it around 53% on Terminal-Bench v4.0 at an anticipated per-task cost near $2.50 - above GLM-5.3 (max) and level with GPT-6 Astra (high) on the same chart. If it holds up under replication, that is frontier-adjacent agentic coding at a flash-tier price.\n- \n**Availability:** free during the launch window on both OpenCode and OrcaRouter (see the cloud-pricing table); a permanent price has not been announced.\n\nTreat every number here as provisional until the operator identifies itself and third parties replicate the benchmarks.\n\n- proprietary\n- Sep 2026\n\n## Scores\n\nSave your hardware and every model page answers the real question: will it run on *your* machine, and how fast?\n\n[Join free - save your rig →](https://tokenstead.ai/login?return_to=%2Fonboarding)\n\n## Or run it in the cloud\n\nLive per-provider pricing, throughput and uptime. Click a column to sort.\n\n| Provider | Type | Input $/M | Output $/M | Cache $/M | Tok/s | Latency | Uptime | Value | \n|---|---|---|---|---|---|---|---|---|\n|  | Sub | - | - | - | - | - | - | $10.00/mo Go ($5 first month) | \n\nDefault order: throughput among 95%+ uptime providers, then latency; subscriptions last. Sort by any column. Subscription rows show $/mo in the Value column - per-token columns are \"-\". Affiliate links are marked sponsored / nofollow. Confirm current pricing on the provider's site before committing.\n\n[Detailed API pricing page + JSON endpoint →](https://tokenstead.ai/models/union-alpha/pricing)\n\n## Inference cost over time\n\nData accumulates from the first daily sync - longer ranges populate over time. Prices come from OpenRouter snapshots, not a historical API.", "url": "https://wpnews.pro/news/multiple-providers-offer-free-mystery-model-union-alpha", "canonical_source": "https://tokenstead.ai/models/union-alpha", "published_at": "2026-09-17 21:46:30+00:00", "updated_at": "2026-09-17 21:55:09.703342+00:00", "lang": "en", "topics": ["large-language-models", "ai-products", "ai-tools", "ai-agents"], "entities": ["Union Alpha", "OpenCode", "OrcaRouter", "GLM-5.3 Flash", "GLM-5.4", "Pliny the Liberator", "Artificial Analysis", "GPT-6 Astra"], "alternates": {"html": "https://wpnews.pro/news/multiple-providers-offer-free-mystery-model-union-alpha", "markdown": "https://wpnews.pro/news/multiple-providers-offer-free-mystery-model-union-alpha.md", "text": "https://wpnews.pro/news/multiple-providers-offer-free-mystery-model-union-alpha.txt", "jsonld": "https://wpnews.pro/news/multiple-providers-offer-free-mystery-model-union-alpha.jsonld"}}