---
id: "upstage/solar-pro4"
also: ["upstage/solar-pro4-20260810"]
card_usd_per_m: "0.15 in, 0.6 out, at upstage"
cheapest_list_usd_per_m: "0.15 in, 0.6 out, at upstage on openrouter"
cheapest_effective_usd_per_m: "0.0893 in, 0.9759 out, at upstage/zdr on openrouter"
context: 524288
max_output: 131072
input: ["text"]
output: ["text"]
released: "2026-08-10"
reasoning: ["max", "xhigh", "high", "medium", "low", "minimal", "none"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["frequency_penalty", "include_reasoning", "logprobs", "max_tokens", "parallel_tool_calls", "presence_penalty", "reasoning", "reasoning_effort", "repetition_penalty", "response_format", "structured_outputs", "temperature", "tool_choice", "tools", "top_k", "top_logprobs", "top_p"]
endpoints: 3
gateways: "openrouter (3)"
no_training: 3
trains: 0
retains_prompts: 2
intelligence: 28.2000
coding: 52.7000
---
# Upstage: Solar Pro 4

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...