upstage / text-generation API-only released 2026-08-10

Solar Pro 4

Name: Solar Pro 4
Price: 0.15 USD
Author: upstage

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive...

Input / 1M

$0.15

Output / 1M

$0.60

Context

524.3K

AA Intelligence

28.2

Closed weights — available only as a hosted API text → text View on OpenRouter ↗

Pricing

via OpenRouter · USD per 1M tokens · synced 2026-10-24

$0.15

input / 1M

$0.60

output / 1M

$0.03

cached input / 1M

$0.75

1M in + 1M out

Context window: 524,288 tokens
Max output: 131,072 tokens
Providers: 1
Cheapest provider: Upstage · $0.15 / $0.60
Best throughput: —
AA Intelligence / Coding / Agentic: 28.2 / 52.7 / —

✓ Tool calling ✓ Reasoning ✓ Structured outputs ✗ Image input ✗ File input ✗ Audio input ✓ Prompt caching

Price history

tracking started — chart appears after 7 days of snapshots (6 recorded)

Current: $0.15 input · $0.60 output per 1M tokens

Benchmarks

Third-party indices as published through OpenRouter — Artificial Analysis and Design Arena. Not measured by us.

AA Intelligence Index: 28.2
AA Coding Index: 52.7
AA Agentic Index: —

Design Arena

CategoryEloWin %Rank

webapps 1105 30% #38

3d 1178 46.4% #57

codecategories 1182 39% #65

dataviz 1177 41.3% #68

gamedev 1170 39.9% #68

uicomponent 1147 35.5% #78

website 1176 37.5% #78

Providers

1 provider · per 1M tokens · last 30 min metrics

Provider	Quant	Context	Input	Output	Uptime	Tok/s
Upstage	unknown	524.3K	$0.15	$0.60	100%	—
Upstage	unknown	524.3K	$0.15	$0.60	100%	—

Provider data from OpenRouter's endpoint listing, refreshed daily.

Specifications

Organisation: upstage
Released on OpenRouter: 2026-08-10
Context window: 524,288 tokens
Max output: 131,072 tokens
Input: text
Output: text
Tokenizer: Other
Moderated by provider: No
OpenRouter id: upstage/solar-pro4

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Prices, context and providers from the public OpenRouter API, snapshotted daily; benchmark indices from Artificial Analysis. See /methodology.