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Solar Mini 4

By the OceanToken teamPrices from the OceanToken catalogCatalog as of November 5, 2026

Solar Mini 4 (upstage/solar-mini4) is a language model from Upstage on the OceanToken API at $0.10 per 1M input tokens and $0.40 per 1M output tokens, with a 524K-token context window and reasoning, tool calling and structured outputs.

Context window
524K tokens
Max output
131K tokens
Input
text
Output
text
Chat with this model Get API Key 

LearnWhat Solar Mini 4 is and what it can do

What is Solar Mini 4?

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.

Per 1M input / output tokens
$0.10 / $0.40

Starting price

Context window
524K

Up to 131K output per reply

Input
text

Output: text

What Solar Mini 4 can do

  • Multi-step reasoning

  • Tool-using agents

  • Structured outputs (JSON)

CompareHow its price and specs stack up

Solar Mini 4 vs similar models: price

What you pay for Solar Mini 4 and the models most like it: the same kind of work, from the families we feature, priced within about three times of it.

Per 1M tokens, half input and half outputPrices as of November 5, 2026.

  1. Solar Mini 4Upstage

    • Price$0.25

  2. GPT-6 LunaOpenAI

    • Official$0.30
    • Tier 1–3$0.27 −10%

  3. Qwen3.8 FlashQwen

    • Official$0.31
    • Tier 1$0.295 −5%
    • Tier 2$0.248 −20%
    • Tier 3$0.233 −25%

  4. DeepSeek V4.1 Flash (1017)DeepSeek

    • Official$0.75
    • Tier 1$0.525 −30%
    • Tier 2$0.488 −35%
    • Tier 3$0.45 −40%

  5. GLM 5.3 FlashZ.ai

    • Official$0.325
    • Tier 1–3$0.325

  6. MiniMax M3MiniMax

    • Official$0.75
    • Tier 1–3$0.75

  • Solar Mini 4 vs GPT-6 Luna

    GPT-6 Luna costs $0.27: 1.1× the price of Solar Mini 4.

    −10% at the top tier

    GPT-6 Luna API 

  • Solar Mini 4 vs Qwen3.8 Flash

    Qwen3.8 Flash costs $0.295: 1.2× the price of Solar Mini 4.

    −25% at the top tier

    Qwen3.8 Flash API 

  • Solar Mini 4 vs DeepSeek V4.1 Flash (1017)

    DeepSeek V4.1 Flash (1017) costs $0.525: 2.1× the price of Solar Mini 4.

    −40% at the top tier

    DeepSeek V4.1 Flash (1017) API 

  • Solar Mini 4 vs GLM 5.3 Flash

    GLM 5.3 Flash costs $0.325: 1.3× the price of Solar Mini 4.

    GLM 5.3 Flash API 

  • Solar Mini 4 vs MiniMax M3

    MiniMax M3 costs $0.75: 3.0× the price of Solar Mini 4.

    MiniMax M3 API 

Solar Mini 4 specs

The technical card for Solar Mini 4, from the OceanToken catalog.

Context window
524K tokens

524,288

Max output
131K tokens

131,072

Input
text
Output
text
Reasoning
Yes

reasoning_effort

Tool calling
Yes

tool_choice

Structured outputs
Yes

response_format

Prompt caching
Reads $0.01

official price, at every tier

Solar Mini 4 model ID and endpoint

OceanToken model ID
upstage/solar-mini4
OpenAI-compatible base URL
https://api.oceantoken.ai/v1
Endpoint
POST /v1/chat/completions

Buy and buildWhat it costs and how to send your first request

Solar Mini 4 API pricing

Prices come from the OceanToken catalog as of November 5, 2026. You pay per use from a prepaid balance, with no subscription.

Input
$0.10 / 1M tokens
Output
$0.40 / 1M tokens
Cached input
$0.01 / 1M tokens

OceanToken starting price as of November 5, 2026. The console always shows the current price. How tiers work

Add credits Specs, request sample and alternatives in the docs 

Solar Mini 4 cost calculator

Pick a typical request or enter your own token counts. The calculator uses the starting prices on this page and shows the same workload on the models compared above.

Per request
$0.0076
Per month
$7.60

The same workload per month

Solar Mini 4$7.60
GPT-6 Luna$7.20
Qwen3.8 Flash$10.34
DeepSeek V4.1 Flash (1017)$15.96
GLM 5.3 Flash$11.00
MiniMax M3$22.80

At the starting price (tier 1). Cached input is billed at the cache-read price; cache writes are left out because they depend on how often your prompt prefix changes. Your console shows the rate for your tier.

What a request costs

RequestInput tokens per requestOutput tokens per requestCost
Chat reply2,000600$0.00044
Agent step60,0004,000$0.0076
Long document summary400,00012,000$0.04

Input and output tokens at the starting price above, with no caching.

How to use Solar Mini 4 on OceanToken

Three steps from no account to a working request. The same key and balance work for every model in the catalog.

  1. Create an account and get an API key

    Create an OceanToken account, then create a key. One key works for every model your account can use.

    Get API Key 

  2. Add credits

    OceanToken is prepaid: add credits, and each request is billed from that balance. Your console shows the rate for your tier.

    Add credits 

  3. Call Solar Mini 4 from your code

    Point an OpenAI SDK at https://api.oceantoken.ai/v1 and use the model ID upstage/solar-mini4. The code below sends one request.

    Get API Key 
    from openai import OpenAI
# Your API Key from the OceanToken console
client = OpenAI(base_url="https://api.oceantoken.ai/v1",
                api_key="YOUR_API_KEY")
reply = client.chat.completions.create(
    model="upstage/solar-mini4",
    messages=[{"role": "user", "content": "Hello"}])
print(reply.choices[0].message.content)

    Specs, request sample and alternatives in the docs 

Solar Mini 4 API: frequently asked questions

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.

Solar Mini 4 costs $0.10 per 1M input tokens and $0.40 per 1M output tokens. Cached input costs $0.01 per 1M tokens. These are OceanToken starting prices as of November 5, 2026, charged per use to your prepaid balance. The console always shows the current price.

Solar Mini 4 has a context window of 524K tokens (524,288 tokens).

Solar Mini 4 supports tool calling, structured outputs and reasoning. It takes text input and returns text. The catalog does not list image input (vision) for it.

Send requests to https://api.oceantoken.ai/v1/chat/completions with the model ID upstage/solar-mini4 and your OceanToken API key. The API is OpenAI-compatible, so an OpenAI SDK needs only the base URL https://api.oceantoken.ai/v1 and your key. The Responses API and the Anthropic Messages API (/v1/messages) work too. The same OceanToken API key works for every model your account can use. Full reference: docs.oceantoken.ai.

OceanToken is prepaid. Open Credits in the console, choose an amount and pay by card on Stripe's hosted checkout page (Link works too). Your balance updates a few seconds after payment. Have a trial code? Redeem it on the same page.

Purchased credits are valid for 12 months from the date of purchase. Credits from trial codes, promotions or gifts may have a shorter validity. All purchases are final and non-refundable, except where the law requires a refund. Section 6 of the Terms of Service has the details.

Not if the request never ran: a request refused for an insufficient balance or by a safety check, or one whose provider fails before returning any output, is not charged. A video job that fails releases the amount it held. If a request breaks off after the model has started producing output, for example a stream cut off part-way, you pay for the tokens that were processed and generated for it.

More from Upstage

Solar Pro 4 Solar Pro 3 All Upstage models 

Similar language models

GLM 5.3 FlashZ.ai MiniMax M3MiniMax Qwen3.8 27BQwen Kimi K2.7 CodeMoonshotAI Kimi K3MoonshotAI Laguna S 2.1Poolside 

Compare Solar Mini 4 with other models

Gemini 3.5 FlashGoogle−10% GPT-6.1 SolOpenAI−10% Claude Sonnet 5.5Anthropic−10% 

Keep exploring

LLM API prices, lowest first 

Sources

By the OceanToken team, from the catalog and the sources above.

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