Solar Pro 4
Solar Pro 4 is Upstage's proprietary reasoning-focused agentic LLM (text→text) for finishing multi-step commercial work: long documents, terminal tasks, and multi-turn tool use. Supports English, Korean, and Japanese with a ~512K context window (OpenRouter listing ~524K) and up to 128K output tokens. Reasoning effort is adjustable (high for deep analysis, low for fast chat).
Key Specifications
Parameters
-
Context
524.3K
Release Date
August 6, 2026
Average Score
69.9%
Timeline
Key dates in the model's history
Announcement
August 6, 2026
Last Update
September 10, 2026
Today
September 19, 2026
Technical Specifications
Parameters
-
Training Tokens
-
Knowledge Cutoff
-
Family
-
Capabilities
MultimodalZeroEval
Pricing & Availability
Input (per 1M tokens)
$0.30
Output (per 1M tokens)
$1.20
Max Input Tokens
524.3K
Max Output Tokens
131.1K
Supported Features
Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning
Benchmark Results
Model performance metrics across various tests and benchmarks
Programming
Programming skills tests
SWE-Bench Verified
OpenHands; Upstage in-house same internal environment • Self-reported
Reasoning
Logical reasoning and analysis
GPQA
GPQA Diamond (vendor table) • Self-reported
Other Tests
Specialized benchmarks
AA-LCR
Artificial Analysis as of August 2026 (public listing upcoming per vendor) • Self-reported
AIME 2026
Upstage in-house same internal environment • Self-reported
BrowseComp
Upstage in-house same internal environment • Self-reported
LiveCodeBench
Upstage in-house same internal environment • Self-reported
MMLU-Pro
Upstage in-house same internal environment • Self-reported
Tau3 Banking
Artificial Analysis as of August 2026 (public listing upcoming per vendor) • Self-reported
Terminal-Bench 2.1
Artificial Analysis as of August 2026 (public listing upcoming per vendor) • Self-reported
License & Metadata
License
proprietary
Announcement Date
August 6, 2026
Last Updated
September 10, 2026
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