What is the difference between GPT-4.5 and OpenAI: GPT-5.6 Sol?

Both are developed by OpenAI but target different use cases. GPT-4.5 has a 128K token context window vs OpenAI: GPT-5.6 Sol's 1.1M. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or OpenAI: GPT-5.6 Sol?

It depends on your use case. GPT-4.5 and OpenAI: GPT-5.6 Sol each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to OpenAI: GPT-5.6 Sol?

GPT-4.5 costs $75/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. OpenAI: GPT-5.6 Sol is $70.00/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-4.5 and OpenAI: GPT-5.6 Sol on Rival?

This page shows a side-by-side comparison of GPT-4.5 and OpenAI: GPT-5.6 Sol 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-4.5 and OpenAI: GPT-5.6 Sol?

Both are developed by OpenAI but target different use cases. GPT-4.5 has a 128K token context window vs OpenAI: GPT-5.6 Sol's 1.1M. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or OpenAI: GPT-5.6 Sol?

It depends on your use case. GPT-4.5 and OpenAI: GPT-5.6 Sol each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to OpenAI: GPT-5.6 Sol?

GPT-4.5 costs $75/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. OpenAI: GPT-5.6 Sol is $70.00/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-4.5 and OpenAI: GPT-5.6 Sol on Rival?

This page shows a side-by-side comparison of GPT-4.5 and OpenAI: GPT-5.6 Sol 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-4.5 vs OpenAI: GPT-5.6 Sol: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

GPT-4.5Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Sol has the edge — newer, bigger context window.

OpenAI: GPT-5.6 Sol is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

OpenAI: GPT-5.6 Sol

Input

$5.00

15× cheaper

Output

$30.00

5.0× cheaper

OpenAI: GPT-5.6 Sol is cheaper on both — 15× input, 5.0× output

Writing DNA

Style Comparison

Similarity

62%

OpenAI: GPT-5.6 Sol uses 3.3x more emoji

GPT-4.5

OpenAI: GPT-5.6 Sol

63%Vocabulary63%

16wSentence Length15w

0.57Hedging0.79

4.7Bold3.4

6.4Lists3.8

0.00Emoji0.03

1.30Headings0.95

0.54Transitions0.08

Based on 11 + 27 text responses

Research

What we learned reading every model

GPT-4.5 and OpenAI: GPT-5.6 Sol 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

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Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

GPT-4.5Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Sol has the edge — newer, bigger context window.

OpenAI: GPT-5.6 Sol is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

OpenAI: GPT-5.6 Sol

Input

$5.00

15× cheaper

Output

$30.00

5.0× cheaper

OpenAI: GPT-5.6 Sol is cheaper on both — 15× input, 5.0× output

Writing DNA

Style Comparison

Similarity

62%

OpenAI: GPT-5.6 Sol uses 3.3x more emoji

GPT-4.5

OpenAI: GPT-5.6 Sol

63%Vocabulary63%

16wSentence Length15w

0.57Hedging0.79

4.7Bold3.4

6.4Lists3.8

0.00Emoji0.03

1.30Headings0.95

0.54Transitions0.08

Based on 11 + 27 text responses

Research

What we learned reading every model

GPT-4.5 and OpenAI: GPT-5.6 Sol 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

GPT-4.5 vs GPT-5Version compare

GPT-4.5 vs MiniMax M3New provider

GPT-4.5 vs Llama 4 MaverickNew provider