Claude 3 Opus vs Solar Pro 3

Compare Claude 3 Opus by Anthropic against Solar Pro 3 by Upstage, context windows of 200K vs 128K, tested across 8 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or Solar Pro 3?

Claude 3 Opus and Solar Pro 3 are both competitive models. Claude 3 Opus costs $15/M input tokens vs $0/M for Solar Pro 3. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and Solar Pro 3

Claude 3 Opus is made by anthropic while Solar Pro 3 is from upstage. Claude 3 Opus has a 200K token context window compared to Solar Pro 3's 128K. On pricing, Claude 3 Opus costs $15/M input tokens vs $0/M for Solar Pro 3.

Our Verdict
Claude 3 Opus
Claude 3 Opus
Solar Pro 3
Solar Pro 3Runner-up

No community votes yet. On paper, Claude 3 Opus has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
89%

Solar Pro 3 uses 654.8x more bold

Claude 3 Opus
Solar Pro 3
54%Vocabulary50%
14wSentence Length21w
0.48Hedging0.42
0.0Bold6.5
3.0Lists2.2
0.00Emoji0.17
0.00Headings0.56
0.06Transitions0.12
Based on 3 + 18 text responses
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Claude 3 OpusSolar Pro 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
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