Upstage

Solar Pro 4

CTX524K

60Quality

Reasoning · Tools

Input$0.30/M

Output$1.20/M

Upstage's flagship model, specialized for agentic use

PaidProprietary968/1044

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UpstageTextCommon

Solar Pro 4

Upstage's flagship model, specialized for agentic use

solar-pro4

Type: Text
Quality: 60 · Top 40% on the LMArena Text
Context window: 524,288 tokens
Max output: 131,072 tokens
Input price: $0.30 / 1M tokens
Output price: $1.20 / 1M tokens
Cache read: $0.06 / 1M tokens
Cache write: —
Released: Aug 6, 2026
Knowledge cutoff: Feb 2026
Takes in: Text
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: No
Access: Paid
License: Proprietary
Rarity: Common
Set number: 968/1044

Open Upstage docs Quality 60 Where to run it 6 Evolution 3/3 Meet its creature Battle GPT-5.6 Luna

Weights aren’t public. Use is governed by Upstage’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: developers.upstage.ai.

How good is it?

Public leaderboard scores for Solar Pro 4, refreshed daily from Epoch AI and LMArena.

Top 40% of the 416 models on the LMArena Text: #169.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

LMArena Text#169 of 416
People compare two anonymous answers and vote for the better one.1,387 rating
LMArena Text · Coding#119 of 411
The text arena’s coding prompts only.1,439 rating
LMArena Text · Math#122 of 400
The text arena’s math prompts only.1,420 rating
LMArena Text · Creative writing#211 of 414
The text arena’s creative writing prompts only.1,314 rating
LMArena WebDev#106 of 145
Each model builds a web app from the same prompt; people pick the better one.1,371 rating

Scores from LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

6 providers sell Solar Pro 4 through an API. Prices are per million tokens, cheapest first.

CheapestLLMTR$0.03 in · $0.12 out
From the labUpstage$0.30 in · $1.20 out

API providers

Provider	Input	Output	Context
LLMTRCheapest paid`upstage/solar-pro4`	$0.03	$0.12	524K
NanoGPT`upstage/solar-pro4`	$0.03	$0.12	524K
AI/ML API`upstage/solar-pro4`	$0.041	$0.17	524K
OpenRouter`upstage/solar-pro4`	$0.09	$0.36	524K
Kilo Gateway`upstage/solar-pro4`	$0.30	$1.20	524K
UpstageOfficial`solar-pro4`	$0.30	$1.20	524K

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

Solar Pro 4

Solar Pro 4

How good is it?

Leaderboards

Where to run it

API providers

Face off

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