Korean AI lab Upstage has released Solar Pro 4, scoring 42 on the Artificial…
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Korean AI lab Upstage has released Solar Pro 4, scoring 42 on the Artificial Analysis Intelligence Index, a significant increase from Solar Pro 3’s 14 Solar Pro 4 is @upstageai's new proprietary flagship reasoning model, replacing Solar Pro 3 from April 2026. At 42 on the Intelligence Index it sits alongside Inkling (xhigh, 42) and just behind MiMo-V2.5-Pro (43), and shows a 27-point increase over Solar Pro 3. Pricing increases to $0.30/$1.20/$0.06 per 1M input/output/cache hit tokens from Solar Pro 3's $0.15/$0.60/$0.02 via Upstage’s first-party API. Key results: ➤ Solar Pro 4’s largest improvements on Solar Pro 3 are on agentic and long context work. Terminal-Bench v2.1 improves from 12% to 57%, AA-LCR from 31% to 71%, and τ³-Banking from 9% to 23%. GDPval-AA v2 shows strong progress on real-world agentic tasks, where Solar Pro 3 scored an Elo of 498, well below the human baseline of 1000, Solar Pro 4 scores 1276. ➤ AA-Omniscience improvement from -53 to -1 was driven by abstaining on more questions. Solar Pro 4 attempts only 41% of questions against 92% for Solar Pro 3, and its hallucination rate is 24%, higher than Command A+ (14%) and MiniMax-M3 (18%), and a vast…
- context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
- token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
- AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
A 27 point jump concentrated in agentic and long- work, at $0.30/$1.20 per million , puts a credible cheaper option on the table for workloads.
“Solar Pro 4 is @upstageai's new proprietary flagship reasoning model, replacing Solar Pro 3 from April 2026. At 42 on the Intelligence Index it sits alongside Inkling (xhigh, 42) and just behind MiMo-V2.5-Pro (43), and shows a 27-point increase over Solar Pro 3.”
ArtificialAnlys
“Solar Pro 4’s largest improvements on Solar Pro 3 are on agentic and long context work. Terminal-Bench v2.1 improves from 12% to 57%, AA-LCR from 31% to 71%, and τ³-Banking from 9% to 23%.”
ArtificialAnlys
“AA-Omniscience improvement from -53 to -1 was driven by abstaining on more questions. Solar Pro 4 attempts only 41% of questions against 92% for Solar Pro 3, and its hallucination rate is 24%, higher than Command A+ (14%) and MiniMax-M3 (18%), and a vast improvement from Solar Pro 3’s 88%.”
ArtificialAnlys
“Solar Pro 4 is more token efficient than Solar Pro 3, though still verbose for its intelligence level. It uses 43k output tokens per Intelligence Index task, around 17% fewer than Solar Pro 3's 52k.”
ArtificialAnlys
“The intelligence gain comes with a hit to latency. Solar Pro 4 takes 9.5 minutes to complete an average Intelligence Index task, against 6.9 minutes for Solar Pro 3, despite using fewer output tokens per task.”
ArtificialAnlys
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