Upstage Solar Pro 4

Upstage Solar Pro 4 lists base rates of $0.15 per million input tokens and $0.60 per million output tokens. Estimate both input and output token volume and any additional charges for your workload. Upstage direct API billing page embeds a literal UTC schedule: from October 20, 2026, $0.15 input/$0.60 output per MTok and $0.03 cached input (50% off standard $0.30/$1.20, cache $0.06). The same page's standard card and the model page still show undiscounted figures; the dated changelog confirms the October 20 shift from 70% to 50% off. Earlier scheduled discounts were $0.03/$0.12 until September 11 and $0.09/$0.36 until October 20; the current window has no published end. Alias solar-pro4 resolves to solar-pro4-260806. Model specs round context to 512K/128K output; Responses gives an exact 131,072 output ceiling.

Upstage Solar Pro 4 is a frontier tier from Upstage. It suits long-context, cost-sensitive api, korean + english. Omitted/null reasoning effort leaves reasoning off; none/minimal also disable it, while low through max enable it. Reasoning consumes the completion budget. Responses is stateless and text-only; replay history, and do not assume OpenAI conversation/storage/background parameters are supported. Model specs round context to 512K; an exact combined-token context cap is unverified. On-premises access does not establish public weights or a redistribution licence. Its public AA index row is an estimate of 28 (asterisk), withheld from the independently matched score display.