Solar Pro 4 Thinking

Upstage's Solar Pro 4 with reasoning enabled for harder agentic workflows, document-intensive work, coding, planning, and analysis across a 524K-token context window.

Reasoning
Tool Calling
Structured Output

Added Aug 11, 2026

Pricing

Auto routing · per 1M tokens

Input: $0.030
Output: $0.12
Cache read: $0.0060

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Specifications

Context window: 524.3K
Max output: 131.1K
Avg output (7d): 2.3K tokens; Longer than 94% of models

Benchmarks

Artificial Analysis

LMArena

Sourced from Artificial Analysis.

Intelligence Index

28.2

Better than 83% of models compared

Coding Index

52.7

Better than 62% of models compared

Agentic work

AutomationBench-AA

Workflow automation with guardrail penalties

9.1%

Better than 33% of models compared

GDPval-AA v2

Economically valuable tasks (Elo)

1110 Elo

Better than 54% of models compared

Document reasoning

GDP.pdf

Professional PDF reasoning: all-pass rate

5.6%

Better than 28% of models compared

AA-LCR v1.1

Long context reasoning with updated grading

74.0%

Better than 71% of models compared

Reasoning

HLE

Humanity's Last Exam

29.2%

Better than 77% of models compared

CritPt

Research-level physics reasoning

5.4%

Coding

Terminal-Bench v4.0

Practical coding and terminal tasks

0.5%

Better than 35% of models compared

SciCode

Python programming for scientific computing

44.6%

Better than 36% of models compared

Knowledge

AA-Omniscience Accuracy

Proportion of correctly answered questions

18.9%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

24.4%

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

89.1%

Better than 86% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation

74.0%

Better than 71% of models compared

GDPval-AA (unversioned / legacy)

Economically valuable tasks

30.5%

Last updated Oct 10, 2026