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Upstage

Solar Pro 4

  • Released
  • Closed weights
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Intelligence Index

Reasoning setting

28.2
Estimated · Artificial Analysis v4.3.2
API price from
≈ $0.03 in / ≈ $0.11 out / 1M tokOpenRouter · Upstage · promotional
Context window
512K tok

Performance profile

ReasoningRank #26 of 107
89.1%
GPQA Diamond
CodingRank #51 of 94
44.6%
SciCode

Capabilities

Context window

Modalities

Measured setting

Integration

Reasoning trade-offs

Source (opens in a new tab)
Intelligence Index v4.3.2
ReasoningEstimated
Intelligence Index
28.2

Pricing & access

API route
OpenRouter · UpstageAPI
Tier & contextStandard · Promotional

USD per 1M tokens

Input
$0.027
Output
$0.108
Cached input
$0.0054

Benchmarks

Full leaderboardSource (opens in a new tab)

Humanity’s Last Exam

Frontier reasoning

Solar Pro 4 · Reasoning#51 of 126

  1. 1Claude Opus 5.5Max61.4%
  2. 2Claude Fable 5.1Max59.1%
  3. 3Gemini 4 ArgonHigh57.1%
  5. 48InklingExtra high31.9%
  6. 49Nemotron 3.5 Super VLReasoning30.7%
  7. 50A.X-K2Reasoning29.6%
  8. 51Solar Pro 4Reasoning29.2%
  9. 52Qwen3.5 397B A17BReasoning29.0%
  10. 53Solar Open2 250BReasoning28.5%
  11. 54Nemotron 3 Ultra 550B A55BReasoning28.4%

Peers use their best measured result on this benchmark.