Upstage: Solar Pro 4 is Upstage's model, and its measured tokenizer sits in Upstage's own signature group alongside its sibling models. No other maker's measured model shares it so far.
| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Exact match with 1 other model | tk_865d84ce |
| API surface | No other entry shares this exact contract | api_86b78bc9 |
| Context and output | 524,288 context · 131,072 max output | declared |
| Reasoning contract | Optional | declared |
| Serving providers observed | Upstage | measured 21 August 2026 |
Click a row to open the full comparison.
An x marks a row excluded as corrupt (caching or provider interference detected during measurement). Overhead subtracted: 52 prompt tokens.
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive...
Supported parameters
frequency_penaltyinclude_reasoningmax_tokenspresence_penaltyreasoningresponse_formatstructured_outputstemperaturetool_choicetoolstop_p
defaults: {}
Cite this page as the evidence record for Upstage: Solar Pro 4: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.
