Upstage · Released Sep 22, 2026Solar Mini 4
Upstage's compact, cost-efficient model for agentic use.
- Capability
- —No ECI score yet
- Input
- $0.10per 1M tokens
- Output
- $0.40per 1M tokens
- Context
- 524K131K max output
What it costs
- Input
- $0.10per million tokens
- Output
- $0.40per million tokens
- Cached input
- $0.01per million tokens
- Blended (3:1)
- $0.175cheaper than 78% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $0.40 |
| Team assistant25M input + 5M output tokens | $4.50 |
| Production app250M input + 50M output tokens | $45.00 |
Official Upstage API price, as listed on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for Solar Mini 4 yet.
The details
- Lab
- Upstage
- Released
- Sep 22, 2026
- Knowledge cutoff
- Feb 2026
- Context window
- 524,288 tokens
- Max output
- 131,072 tokens
- Inputs
- Text
- Output
- Text
- Reasoning
- Adjustable effort minimal · low · medium · high · xhigh · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
solar-mini4on Upstage- Availability
- 4 API providerslisted on models.dev
More from Upstage
About Solar Mini 4
How much does Solar Mini 4 cost?
Solar Mini 4 costs $0.10 input / $0.40 output per million tokens (official Upstage API price). Cached input is $0.01 per million tokens. At a 3:1 input-to-output mix that is $0.175 per million tokens, cheaper than 78% of the 445 priced models we track.
What is the context window of Solar Mini 4?
Solar Mini 4 accepts up to 524,288 tokens per request and can write up to 131,072 tokens in one response.
How good is Solar Mini 4?
Epoch AI has not published a Capabilities Index score for Solar Mini 4 yet.
Is Solar Mini 4 open source?
No. Solar Mini 4 is proprietary; you use it through Upstage’s API or partner platforms.
What inputs does Solar Mini 4 support?
Solar Mini 4 accepts text and replies in text. It is a reasoning model with minimal, low, medium, high, xhigh and max effort settings, supports tool calling and can return structured JSON output.
When was Solar Mini 4 released?
Upstage released Solar Mini 4 on Sep 22, 2026. Its training data runs to Feb 2026.
What are the best alternatives to Solar Mini 4?
The closest current models from other labs on capability, price and release date are MiMo-V2.6-Flash (Xiaomi, $0.14 / $0.28), Ornith 1.5 35B A3B (DeepReinforce, $0.10 / $0.40), Viv Fast (Vivgrid, $0.13 / $0.40) and Mercury 3 (Inception, $0.10 / $0.35).