LIST PRICE SINCE OCT 233B ACTIVE PARAMETERS512K CONTEXTA THIRD OF SOLAR PRO 4KOREAN, ENGLISH, JAPANESE
Solar Mini 4 API Pricing
Solar Mini 4 is Upstage's compact model for agents that run at volume: a 35B-parameter mixture-of-experts that activates 3B parameters per token, with the same 512K window as Solar Pro 4. The list price is $0.10/M input, $0.01/M cached input and $0.40/M output, a third of the flagship on every line. Its launch discount, half price through October 22, 2026 (UTC), ended on schedule, so the list rate is what an account pays now.
Input - per 1M tokens
$0.10/M
Launch discount ended Oct 22 list
Output - per 1M tokens
$0.40/M
Launch discount ended Oct 22 list
Cached input
$0.01/M
Cache read 90% off fresh input -90%
Effective - agentic blend
$0.0561/M
92/8 split - 82% cache
§ 01 / TERMINAL
Solar Mini 4 API cost calculator.
Calculator pre-loaded with Solar Mini 4's list rates, which apply since the launch discount ended on October 22, 2026.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
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Words equivalent (English)
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Effective rate
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§ 02 / SCENARIOS
Solar Mini 4 cost on real workloads.
SUBAGENT
Tool-calling sub-task
$0.00091/call
SUPPORT
Korean support ticket reply
$0.00061/ticket
EXTRACTION
Contract field extraction
$0.00185/doc
LONG CONTEXT
Case file review
$0.010/review
Estimate · solar-tokenizer-estimate · ≈3.8 chars/token Auto-counts as you type
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
Characters 442
Words 74
Tokens (estimated) 116 tokens
Cost as input · uncached $0.00001 USD
Cost as output · uncached $0.00005 USD
Cost as cached input $0.000001 USD
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Solar Mini 4 Current | $0.10 cache $0.01 | $0.40 | $0.0561 agentic 92/8 | 512K | High-volume agents with a 512K window |
| Solar Pro 4 | $0.30 cache $0.06 | $1.20 | $0.191 +3.4× · promo | 512K | The flagship, same window, three times the rate |
| Mistral Small 4 | $0.15 cache $0.015 | $0.60 | $0.0842 +50% | 256K | Low-cost general work from a European vendor |
| GPT-6 Luna | $0.10 cache $0.01 | $0.50 | $0.0682 +22% | 1.05M | High-volume work on a closed frontier stack |
| DeepSeek V4.1 Flash | $0.30 cache $0.006 | $1.20 | $0.15 +2.7× | 1M | Cheap 1M-context agent loops with images |
| GLM-5.3-Flash | $0.15 cache $0.03 | $0.50 | $0.0875 +56% | 1M | Multimodal flash tier with a 1M window |
Solar Mini 4 API pricing FAQ.
What Solar Mini 4 costs now that its launch discount is over, and how it compares with the rest of the Solar line.
Q · 01 How much does Solar Mini 4 cost? +
$0.10/M input, $0.01/M cached input and $0.40/M output, $0.06/M on our 92/8 agentic blend with 82% cache hits. That is what an account pays since October 23, 2026: the launch discount, half price through October 22 (UTC), ended on schedule. All Upstage prices exclude 10% VAT.
Q · 02 How does it compare with Solar Pro 4? +
Same 512K window, a third of the price: at list Solar Pro 4 costs $0.30 / $0.06 / $1.20, exactly three times Solar Mini 4 on every line. Both sit on the same rate-limit ladder. Pro 4 is Upstage's agentic flagship for document work, coding and terminal tasks; Mini 4 is the one Upstage pitches for high-frequency, cost-sensitive calls, with 3B active parameters. Since October 23 the ratio no longer holds on the bill: Mini 4 is back at list, while Pro 4 is still charged at half its list price until further notice, which puts the two closer than their list cards suggest.
Q · 03 Is it cheaper than Solar Pro 3? +
Yes, at list:
$0.10 against $0.15 input and $0.40 against $0.60 output, with four times the context (512K against 128K). Solar Pro 3 was the larger model - 102B total and 12B active parameters - but Upstage ended service for it on October 30, 2026.Q · 04 What is inside it? +
Upstage's model history lists the build
solar-mini4-260922 as a 35B-parameter mixture-of-experts with 3B active, a 512K context, up to 128K output tokens and a February 2026 training cutoff. It supports chat, reasoning, structured outputs and tool calling, in English, Korean and Japanese. The solar-mini4 alias currently points to that build.Q · 05 What are the rate limits? +
They scale with your commitment tier: Tier 0 gets 100 requests and 250,000 tokens per minute, rising through 400 / 500,000 (Explore), 2,000 / 750,000 (Build) and 4,000 / 1.5M (Scale) to 8,000 / 3M on Enterprise. Accounts still on Upstage's legacy tiers are held at 100 requests and 50,000 tokens per minute on this model.
Q · 06 Is the old Solar Mini the same model? +
No. Solar Mini is Upstage's earlier 10.7B dense model with a 32,768-token context, retired on October 30, 2026 at a single
$0.15 figure. Solar Mini 4 is a different model - a 35B mixture-of-experts with 3B active and a 512K window - and is cheaper on input at list.