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upstage · Efficient

Solar Mini 4 Thinking

Added Sep 23, 2026

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Use in the app

Solar Mini 4 with reasoning enabled for agentic tasks and harder analysis across a 524K-token context window.

  • Reasoning
  • Tools
  • Structured output
Input
Text
Output
Text
Reasoning effort
none · low · medium · high
Discovery tier
Efficient

Pricing

USD per 1M tokens
Input
$0.05
Output
$0.20
Cache read
$0.005

Reference prices as published by the model provider. API example

Specifications

Context window
524.3K
Max output
131.1K
Average output (7 days)
2.8K tokens
Longer than 95% of 465 models

Side by side

Solar Mini 4 Thinking compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Solar Mini 4 ThinkingupstageThis modelSolar Pro 4 ThinkingupstageRemove
Providerupstageupstage
Discovery tierEfficientEfficient
AddedSep 23, 2026Aug 11, 2026
Limits
Context window524.29K524.29K
Max output131.07K131.07K
Average output2.8K tokens1.7K tokens
Pricing, USD per 1M tokens
Input$0.05$0.03Best
Output$0.20$0.12Best
Cache read$0.005Best$0.006
Performance
Request success (24h)—99.6%
Benchmark indexes
Intelligence Index—26.6
Capabilities
ReasoningYesYes
ToolsYesYes
Structured outputYesYes
Reasoning effortnone, low, medium, highnone, low, medium, high

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Solar Mini 4 Thinking
  • Solar Pro 4 Thinking

Intelligence Index

  • Solar Mini 4 Thinking—
  • Solar Pro 4 Thinking26.6
3.8Catalog models by score55.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 13.6%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 2.4%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 1,093 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 1,106 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 7.0%

  • AA-LCRv1.1

    Reasoning across long documents

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 70.7%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 29.8%

  • GPQA Diamond

    Graduate-level science questions

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 89.1%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 0.0%

  • SciCode

    Scientific computing in Python

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 48.0%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Solar Mini 4 Thinking: —
    • Solar Pro 4 Thinking: 70.7%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "upstage/solar-mini4:thinking",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="upstage/solar-mini4:thinking",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

upstage

Other upstage models, starting with the same family.