Solar Pro 3 vs Grok 3

Compare Solar Pro 3 by Upstage against Grok 3 by xAI, context windows of 128K vs 128K, tested across 38 shared challenges. Updated April 2026.

Which is better, Solar Pro 3 or Grok 3?

Solar Pro 3 and Grok 3 are both competitive models. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between Solar Pro 3 and Grok 3

Solar Pro 3 is made by upstage while Grok 3 is from xai. Solar Pro 3 has a 128K token context window compared to Grok 3's 128K.

Our Verdict
Grok 3
Grok 3
Solar Pro 3
Solar Pro 3Runner-up

No community votes yet. On paper, Grok 3 has the edge — bigger model tier, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
86%

Solar Pro 3 uses 4.4x more emoji

Solar Pro 3
Grok 3
50%Vocabulary49%
21wSentence Length18w
0.42Hedging0.94
6.5Bold2.5
2.2Lists3.0
0.17Emoji0.04
0.56Headings0.65
0.12Transitions0.08
Based on 18 + 17 text responses
vs

Ask them anything yourself

Solar Pro 3Grok 3

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions