WhichAI / Models / Solar Pro 4

Solar Pro 4

· verified October 13, 2026

public paid api long-context

Provider

Statuspublic

AA Intelligence Index28.2 (official, read October 13, 2026)

Released2026-08-10

Context window524K

ModalitiesText

API price $/1M (in / out)$0.09 / $0.36 (OpenRouter)

Speedn/a

AccessAPI $0.09/$0.36 per 1M tokens on OpenRouter · listed August 10, 2026

In one line

Solar Pro 4 by Upstage, measured by Artificial Analysis at 28.2 on the Intelligence Index, 52.7 on coding. Added to WhichAI automatically from live data on October 13, 2026: no editorial review yet, so judge it by the numbers, not by a verdict. OpenRouter's description: “Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.”

Alternatives worth a look

GLM-5 (Z.ai) · AA 27.9Open weights
GPT-5.2-Codex (OpenAI) · AA 28.5API $1.75/$14 per 1M tokens on OpenRouter · listed January 14, 2026
Grok Build 0.1 (xAI) · AA 27.2Inside Grok Build (xAI's coding agent/CLI)

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 13, 2026. 210 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).