# Upstage — Solar Pro 4 > AI lab announcements, news reports and podcasts. forck.live follows what companies announce about their own products. Press may corroborate an official story; it never leads and never appears as an item of its own. A missing date stays missing. A title is the publisher's words — where a company does not publish in English, an English rendering is listed separately as `Title in English` and named as this site's translation, never as theirs. This file is the record of one model version: what the model registry states about it, Upstage's launch post, the first-party posts this record holds about it, the outlets that reported on those posts, and other companies' announcements that it runs on their platforms. A model ranks nothing here and nothing is composed: each date names whose it is, and a field nothing states is `not stated` rather than missing. - This model's page: https://forck.live/models/solar-pro4 - Upstage's page: https://forck.live/company/upstage - Every model: https://forck.live/models - Catalogue: https://forck.live/llms.txt ## Model - Name: Solar Pro 4 - Company: Upstage (upstage.ai) - Launch post: Solar Pro 4: The Agentic Model That Finishes the Job — https://forck.live/items/18453-solar-pro-4-the-agentic-model-that-finishes-the-job - Announced: 2026-08-11 - Launch source: https://www.upstage.ai/blog/en/solar-pro-4 - Launch chosen by: the earliest dated release post naming it - Released (per models.dev): 2026-08-06 - Listed (per OpenRouter): 2026-08-10 - Open weights: no - Posts about it: 2 - Outlets named under its posts: 0 - OpenRouter id: upstage/solar-pro4 — https://openrouter.ai/upstage/solar-pro4 - Context window: 512K context with up to 128K output tokens — from https://forck.live/items/18453-solar-pro-4-the-agentic-model-that-finishes-the-job - Price: To mark the launch, Solar Pro 4 is 90% off on Upstage Console and OpenRouter through September 10. — from https://forck.live/items/18453-solar-pro-4-the-agentic-model-that-finishes-the-job ## Posts about it _Upstage's own posts whose title names Solar Pro 4, and its launch post, in the record's order: dated newest first, undated last. The record reads the newest 50 first-party posts mentioning the model, every company's together, so a model mentioned more often than that lists the newest of them._ Every entry is one first-party announcement, and carries the same eight fields in this order before any others: Company · Announced · Category · Coverage · Announcement · Group · Source · Record `Source` is the company's own page the announcement was traced to and `Record` is this site's page for it. Both are safe to cite. `Coverage` is a number of outlets, or `not counted` — which means this record reached no count of its own, never that nobody wrote about it. `Category` is this tracker's own analysis, and is authoritative wherever it is stated. `not stated` means either that nothing has analysed the post yet or that the analysis placed it outside this taxonomy; neither is a verdict about the announcement. `Announcement` is whether the post is news of something the company did, rather than a how-to, a customer story, a changelog listing or a staffing note. `Group` is which of this record's groups the entry falls in, carried on the entry itself so it holds where the groups are headings and where they are not. One of: `models`, `covered`, `announcements`, `routine`. Anything after `Record` is held detail that only some announcements carry. ### Upstage — Upstage AI Unveils Solar Pro 4, Scoring 42 on Artificial Analysis Index to Rank Among Global Frontier Models - Company: Upstage (upstage.ai) - Announced: 2026-08-20 - Category: new-model - Coverage: not counted - Announcement: yes - Group: models - Source: https://www.upstage.ai/news/upstage-ai-unveils-solar-pro-4-scoring-42-on-artificial-analysis-index-to-rank - Record: https://forck.live/items/18422-upstage-ai-unveils-solar-pro-4-scoring-42-on-artificial-analysis-index-to-rank - Subject: Solar Pro / Solar Mini Upstage AI launched Solar Pro 4 (SP4), a closed commercial flagship LLM optimized for agent reliability in enterprise workflows such as document understanding and long-context reasoning. It scored 42 points on the Artificial Analysis index, placing it alongside general-purpose frontier models and improving more than threefold over the previous version. Within a week of listing on OpenRouter, SP4's token consumption exceeded 370 billion tokens. ### Upstage — Solar Pro 4: The Agentic Model That Finishes the Job - Company: Upstage (upstage.ai) - Announced: 2026-08-11 - Category: new-model - Coverage: not counted - Announcement: yes - Group: models - Source: https://www.upstage.ai/blog/en/solar-pro-4 - Record: https://forck.live/items/18453-solar-pro-4-the-agentic-model-that-finishes-the-job - Subject: Solar Pro / Solar Mini Upstage released Solar Pro 4, a model designed for agentic workloads such as multi-document analysis, terminal tasks, and multi-turn tool use. It supports a 512K context window with up to 128K output tokens, handles English, Korean, and Japanese, and offers adjustable reasoning effort. The model is available via API with a 90% discount through September 10. ## Who reported on it _This record names no outlet that reported on these posts._ --- Record: https://forck.live/models/solar-pro4 Catalogue: https://forck.live/llms.txt Current issue: https://forck.live/feed.md