Solar Pro 4
Solar Pro 4 is an API-only (closed weights) language model from Upstage, released August 6, 2026. The context window is 512K tokens. API price: $0.3 input / $1.2 output per million tokens.
Check it against your own PC →
Lab
Upstage
Released
August 6, 2026
Weights
API-only (closed weights)
Parameters
–
Context
512K
Price / M tokens
$0.3 / $1.2 in / out
Epoch ECI
not yet rated
Benchmark results
Epoch AI has not published results for Solar Pro 4 yet. New models are usually evaluated within days to weeks.
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