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Upstage: Solar Decide Flash

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.

Modalities
In / out price
50% off
$0.05 / $0per 1M
Context
524K
Released
Oct 8, 2026

Playground

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).

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
$0.09984/M tokens
Output
$0/M tokens
Price history
No effective price data for this selection

Performance

Latency is how long it takes to return the full response (lower is better).

Latency
0.45s

P50, best provider

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)The model was reachable. Request routed to a provider.
99.99%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.84%

Availability over the last 3 days

Last 72 hours
Availability 99.84%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
100.00%

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.

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.

1.
Favicon for https://12panelnow.com/
12PN watch
new
20.3Mtokens
2.
Favicon for https://uschati.nof1experiment.com/
Personal Voice Assistant
new
12.6Mtokens
3.
Favicon for https://github.com/cardhedge/price-checker-agent
CH Price Checker
new
11.6Mtokens
4.
Favicon for https://lexdrop.ai/
Lexdrop reasoning v2
new
10.8Mtokens
5.
Favicon for https://www.premierecopilot.com/
PremiereCopilot
new
8.31Mtokens
Rest of OpenRouter
25.4M
Top 5 Apps
0

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. It runs on the OpenRouter Decisions API rather than the OpenAI-compatible chat endpoint, so the request and response shapes below are specific to structured decisions — chat completions SDKs will not work with it.

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

Documentation

Guides, cookbooks, blog posts, and tools for building with Upstage: Solar Decide Flash on OpenRouter.

Frequently asked questions

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