GPT-4.1 vs Solar Pro 3

Compare GPT-4.1 by OpenAI against Solar Pro 3 by Upstage, context windows of 1.0M vs 128K, tested across 30 shared challenges. Updated April 2026.

Which is better, GPT-4.1 or Solar Pro 3?

GPT-4.1 and Solar Pro 3 are both competitive models. GPT-4.1 costs $2/M input tokens vs $0/M for Solar Pro 3. Context windows: 1048K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4.1 and Solar Pro 3

GPT-4.1 is made by openai while Solar Pro 3 is from upstage. GPT-4.1 has a 1048K token context window compared to Solar Pro 3's 128K. On pricing, GPT-4.1 costs $2/M input tokens vs $0/M for Solar Pro 3.

Our Verdict
GPT-4.1
GPT-4.1
Solar Pro 3
Solar Pro 3Runner-up

No community votes yet. On paper, GPT-4.1 has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

GPT-4.1 uses 2.7x more lists

GPT-4.1
Solar Pro 3
58%Vocabulary50%
19wSentence Length21w
0.38Hedging0.42
9.0Bold6.5
6.1Lists2.2
0.24Emoji0.17
1.01Headings0.56
0.07Transitions0.12
Based on 25 + 18 text responses
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GPT-4.1Solar 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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