What is the difference between GPT-5.3-Codex and OpenAI: GPT-5.6 Sol?

Both are developed by OpenAI but target different use cases. GPT-5.3-Codex has a 400K token context window vs OpenAI: GPT-5.6 Sol's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.3-Codex or OpenAI: GPT-5.6 Sol?

It depends on your use case. GPT-5.3-Codex and OpenAI: GPT-5.6 Sol each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT-5.3-Codex cost compared to OpenAI: GPT-5.6 Sol?

GPT-5.3-Codex costs $1.75/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. GPT-5.3-Codex is $3.25/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-5.3-Codex and OpenAI: GPT-5.6 Sol on Rival?

This page shows a side-by-side comparison of GPT-5.3-Codex 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-5.3-Codex and OpenAI: GPT-5.6 Sol?

Both are developed by OpenAI but target different use cases. GPT-5.3-Codex has a 400K token context window vs OpenAI: GPT-5.6 Sol's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.3-Codex or OpenAI: GPT-5.6 Sol?

It depends on your use case. GPT-5.3-Codex and OpenAI: GPT-5.6 Sol each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT-5.3-Codex cost compared to OpenAI: GPT-5.6 Sol?

GPT-5.3-Codex costs $1.75/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. GPT-5.3-Codex is $3.25/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-5.3-Codex and OpenAI: GPT-5.6 Sol on Rival?

This page shows a side-by-side comparison of GPT-5.3-Codex 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-5.3-Codex vs OpenAI: GPT-5.6 Sol: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

GPT-5.3-CodexRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.3-Codex

Input

$1.75

2.9× cheaper

Output

$14.00

2.1× cheaper

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

GPT-5.3-Codex is cheaper on both — 2.9× input, 2.1× output

Writing DNA

Style Comparison

Similarity

61%

GPT-5.3-Codex uses 4.8x more emoji

GPT-5.3-Codex

OpenAI: GPT-5.6 Sol

65%Vocabulary63%

23wSentence Length15w

0.51Hedging0.79

6.5Bold3.4

6.2Lists3.8

0.16Emoji0.03

1.90Headings0.95

0.03Transitions0.08

Based on 23 + 27 text responses

Research

What we learned reading every model

GPT-5.3-Codex 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-5.3-Codex vs MiniMax M3New provider

GPT-5.3-Codex vs Claude Opus 4.1New provider

GPT-5.3-Codex vs GPT-5Same lab

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

GPT-5.3-CodexRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.3-Codex

Input

$1.75

2.9× cheaper

Output

$14.00

2.1× cheaper

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

GPT-5.3-Codex is cheaper on both — 2.9× input, 2.1× output

Writing DNA

Style Comparison

Similarity

61%

GPT-5.3-Codex uses 4.8x more emoji

GPT-5.3-Codex

OpenAI: GPT-5.6 Sol

65%Vocabulary63%

23wSentence Length15w

0.51Hedging0.79

6.5Bold3.4

6.2Lists3.8

0.16Emoji0.03

1.90Headings0.95

0.03Transitions0.08

Based on 23 + 27 text responses

Research

What we learned reading every model

GPT-5.3-Codex 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-5.3-Codex vs MiniMax M3New provider

GPT-5.3-Codex vs Claude Opus 4.1New provider

GPT-5.3-Codex vs GPT-5Same lab