How much does Solar Mini 4 cost?

Solar Mini 4 costs $0.05/M input tokens and $0.20/M output tokens, with separate rates for Cache Read at $0.005/M tokens.

What is the context length of Solar Mini 4?

Solar Mini 4 has a 524,288 token context window. It supports up to 131,072 completion tokens.

Does Solar Mini 4 support tool calling and structured outputs?

Yes. Solar Mini 4 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Which providers serve Solar Mini 4?

Solar Mini 4 is served by 1 provider on OpenRouter: Upstage.

What other text models does Upstage have?

Solar Decide Flash, Solar Decide, and Solar Pro 4 are other text models from Upstage.

When was Solar Mini 4 released?

Solar Mini 4 was released on September 23, 2026.

Upstage: Solar Mini 4

upstage/solar-mini4

Compare

Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window. It is built for agentic use cases where response speed and cost matter, with fluent Korean alongside strong English and Japanese, and support for long-context workloads.

When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Modalities

In / out price

50% off

$0.05 / $0.20per 1M

Context

524K

Released

Sep 23, 2026

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick: Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Latency / throughput


50% off	$0.10$0.05	$0.40$0.20	$0.01$0.005	1.93s	92 tok/s	99.90%
50% off	$0.10$0.05	$0.40$0.20	$0.01$0.005	2.27s	54 tok/s	100.00%

Input $0.05Output $0.2050% off
92 tok/s99.90% uptime
Input $0.05Output $0.2050% off
54 tok/s100.00% uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.03055/M tokens

Output

$0.3959/M tokens

Solar Mini 4 — Price history

Price history

No effective price data for this selection

		$0.0246	$0.359	82.9%	20.6%
		$0.0321	$0.399	75.4%	79.4%

Effective in $0.0246Effective out $0.359
Token share
20.6%
Effective in $0.0321Effective out $0.399
Token share
79.4%

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.78%

Availability over the last 3 days

Last 72 hours

Availability 99.78%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.72%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Upstage: Solar Mini 4 (Artificial Analysis and Design Arena)
Source	Benchmark	Score
Artificial Analysis	Solar Mini 4 HLE	25.8%
Artificial Analysis	Solar Mini 4 AA-LCR	83.3%
Artificial Analysis	Solar Mini 4 GDPval-AA	29.6%
Artificial Analysis	Solar Mini 4 CritPt	1.4%
Artificial Analysis	Solar Mini 4 SciCode	47.6%
Artificial Analysis	Solar Mini 4 Terminal-Bench 4.0	1.0%
Artificial Analysis	Solar Mini 4 AA-Omniscience Accuracy	18.2%
Artificial Analysis	Solar Mini 4 AA-Omniscience Non-Hallucination Rate	63.5%
Design Arena	Solar Mini 4 Models Arena 3D Elo	1084
Design Arena	Solar Mini 4 Models Arena Code Categories Elo	1127
Design Arena	Solar Mini 4 Models Arena Data Visualization Elo	1135
Design Arena	Solar Mini 4 Models Arena Game Development Elo	1096
Design Arena	Solar Mini 4 Models Arena UI Component Elo	1082
Design Arena	Solar Mini 4 Models Arena Website Elo	1144

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

3.59Ttokens

Cline

Cline is an open-source AI coding agent that lives inside your IDE, autonomously exploring your codebase, editing files, running terminal commands, and using browser automation.

970Btokens

Freebuff

Powerful coding models, funded by ads

925Btokens

Nous Research API

Nous Research is an AI research team focused on advancing open-source AI.

115Btokens

CodeGPT

new

8.12Btokens

Top 5 Apps

161B

Rest of OpenRouter

1.5B

Not currently available through EU in-region routing. In-region routing docs

More models from upstage

Solar Decide Flash

Solar Decide Flash is Upstage's low-latency structured decision model, a faster variant of Solar Decide built on Solar Mini 4 and served through the System One (/v1/systemone) API. Instead of generating text, it reads a state and answers typed questions, returning a choice, a score, or a yes/no answer, each with a probability taken directly from the model. Each decision is a single forward pass, and output tokens are free.

It is tuned for consistently fast response times in routing, classification, and policy checks. It keeps the 512K context window, so a full document can serve as the state, and carries Solar Mini 4's Korean-language strength.

Decisions$0.05 / $0

Solar Decide

Solar Decide is Upstage's structured decision model, served as a System One endpoint on Solar Mini 4. Send a state along with typed questions, and it returns a choice, a score, or a yes/no answer, each with a calibrated probability taken directly from the model rather than written out as text. Because it generates no prose, each decision takes a single forward pass and output tokens are free. With a 512K context window, an entire document can serve as the state. Solar Decide uses the same /v1/systemone schema as Jev, bringing Solar Mini 4's strong Korean understanding to routing, classification, and policy checks.

Decisions$0.05 / $0

Solar Mini 4

When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Text524K context$0.05 / $0.20

Solar Pro 4

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 work, and coding.

When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Text524K context$0.15 / $0.60

Solar Pro 3

Solar Pro 3 is Upstage's powerful Mixture-of-Experts (MoE) language model. With 102B total parameters and 12B active parameters per forward pass, it delivers exceptional performance while maintaining computational efficiency. Optimized for Korean with English and Japanese support.

Text128K context

Upstage: Solar Mini 4

Providers