AI model reference · 2026
Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
- Context window
- 524,288 tokens
- Maximum output
- 131,072 tokens
- Base provider API input
- $0.03 / 1M tokens
- Base provider API rate
- Published evidence
- 0 benchmarks, 2 Arena results
Overview
About Solar Pro 4
A concise catalog overview. Technical limits and published evaluation evidence are listed separately below.
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
Published evaluations
Benchmark results
Only results mapped to this exact model and backed by a named source appear here. Different evaluation protocols are not treated as interchangeable.
No reviewed benchmark result is available for this exact model yet. We leave this section empty instead of assigning a nearby model’s score.
Human preference
Arena results
Arena scores come from blind human preference votes. They are reported separately from task benchmarks and are not used as substitutes for missing benchmark results.
| Category | Score | Rank | Votes | Status |
|---|---|---|---|---|
| Arena TextBlind human preference score for text responses. | 1,376±12 | #173 | 2,447 | Published |
| Arena WebDevBlind human preference score for code and web development. | 1,371±17 | #78 | 1,405 | Published |
Technical reference
Specifications and API facts
Technical limits and reference provider prices come from the current catalog unless a reviewed external source is listed. Missing values stay marked as unavailable.
- Provider
- Upstage
- Release date
- Not available in reviewed sources
- Catalog added
- Aug 10, 2026
- Context window
- 524,288 tokens
- Maximum output
- 131,072 tokens
- Knowledge cutoff
- Not available in reviewed sources
- License
- Not available in reviewed sources
- Input types
- Text
- Output types
- Text
- Reasoning
- Supported
- Provider endpoint tool parameters
- Accepts tool parameters
- Base provider API input
- $0.03 / 1M tokens
- Base provider cached input
- $0.006 / 1M tokens
- Base provider API output
- $0.12 / 1M tokens
These are reference provider API rates, not Writingmate checkout charges. Access in Writingmate follows the allowances of your Writingmate plan.
Provenance
Sources and update status
Source links are attached to the facts and evaluations they support. Catalog-only values are not presented as independently verified claims.
- Arena TextArena AI · Retrieved Aug 28, 2026
- Arena WebDevArena AI · Retrieved Aug 28, 2026
- OpenRouter model catalogOpenRouter
Evidence last updated Aug 28, 2026.
Catalog record updated Aug 10, 2026.
Catalog-added dates describe when a model entered the catalog, not necessarily its public release date.
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