What is the difference between GPT-5.1 and Solar Pro 3?

GPT-5.1 is developed by OpenAI while Solar Pro 3 is developed by Upstage. GPT-5.1 has a 400K token context window vs Solar Pro 3's 128K. You can compare their actual outputs across 38 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or Solar Pro 3?

It depends on your use case. GPT-5.1 and Solar Pro 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 38 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to Solar Pro 3?

GPT-5.1 costs $1.25/M input tokens and Solar Pro 3 costs $0/M input tokens. Solar Pro 3 is $1.25/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.1 and Solar Pro 3 on Rival?

This page shows a side-by-side comparison of GPT-5.1 and Solar Pro 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between GPT-5.1 and Solar Pro 3?

GPT-5.1 is developed by OpenAI while Solar Pro 3 is developed by Upstage. GPT-5.1 has a 400K token context window vs Solar Pro 3's 128K. You can compare their actual outputs across 38 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or Solar Pro 3?

It depends on your use case. GPT-5.1 and Solar Pro 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 38 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to Solar Pro 3?

GPT-5.1 costs $1.25/M input tokens and Solar Pro 3 costs $0/M input tokens. Solar Pro 3 is $1.25/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.1 and Solar Pro 3 on Rival?

This page shows a side-by-side comparison of GPT-5.1 and Solar Pro 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

GPT-5.1 vs Solar Pro 3: Which Is Better?

Updated Jan 2026

Our Verdict

GPT-5.1

Solar Pro 3Runner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

Solar Pro 3

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

31%

Solar Pro 3 uses 17.3x more emoji

GPT-5.1

Solar Pro 3

62%Vocabulary50%

19wSentence Length21w

0.29Hedging0.42

3.5Bold6.5

7.2Lists2.2

0.00Emoji0.17

0.61Headings0.56

0.03Transitions0.12

Based on 14 + 18 text responses

Research

What we learned reading every model

GPT-5.1 and Solar Pro 3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Solar Pro 3 vs MiniMax M3New provider

Solar Pro 3 vs Grok 3New provider

Solar Pro 3 vs Llama 4 MaverickNew provider

Updated Jan 2026

Our Verdict

GPT-5.1

Solar Pro 3Runner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

Solar Pro 3

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

31%

Solar Pro 3 uses 17.3x more emoji

GPT-5.1

Solar Pro 3

62%Vocabulary50%

19wSentence Length21w

0.29Hedging0.42

3.5Bold6.5

7.2Lists2.2

0.00Emoji0.17

0.61Headings0.56

0.03Transitions0.12

Based on 14 + 18 text responses

Research

What we learned reading every model

GPT-5.1 and Solar Pro 3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Solar Pro 3 vs MiniMax M3New provider

Solar Pro 3 vs Grok 3New provider

Solar Pro 3 vs Llama 4 MaverickNew provider