What is the difference between GPT-5.3-Codex and Sonar Pro Search?

GPT-5.3-Codex is developed by OpenAI while Sonar Pro Search is developed by Perplexity. GPT-5.3-Codex has a 400K token context window vs Sonar Pro Search's 200K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.3-Codex or Sonar Pro Search?

It depends on your use case. GPT-5.3-Codex and Sonar Pro Search each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5.3-Codex cost compared to Sonar Pro Search?

GPT-5.3-Codex costs $1.75/M input tokens and Sonar Pro Search costs $3/M input tokens. GPT-5.3-Codex 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-5.3-Codex and Sonar Pro Search on Rival?

This page shows a side-by-side comparison of GPT-5.3-Codex and Sonar Pro Search 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 Sonar Pro Search?

GPT-5.3-Codex is developed by OpenAI while Sonar Pro Search is developed by Perplexity. GPT-5.3-Codex has a 400K token context window vs Sonar Pro Search's 200K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.3-Codex or Sonar Pro Search?

It depends on your use case. GPT-5.3-Codex and Sonar Pro Search each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5.3-Codex cost compared to Sonar Pro Search?

GPT-5.3-Codex costs $1.75/M input tokens and Sonar Pro Search costs $3/M input tokens. GPT-5.3-Codex 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-5.3-Codex and Sonar Pro Search on Rival?

This page shows a side-by-side comparison of GPT-5.3-Codex and Sonar Pro Search 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 Sonar Pro Search: Which Is Better?

Updated Feb 2026

Our Verdict

GPT-5.3-Codex

Sonar Pro SearchRunner-up

No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

GPT-5.3-Codex

Input

$1.75

1.7× cheaper

Output

$14.00

1.1× cheaper

Sonar Pro Search

Input

$3.00

Output

$15.00

GPT-5.3-Codex is cheaper on both — 1.7× input, 1.1× output

Writing DNA

Style Comparison

Similarity

72%

GPT-5.3-Codex uses 15.8x more emoji

GPT-5.3-Codex

Sonar Pro Search

65%Vocabulary60%

23wSentence Length22w

0.51Hedging0.30

6.5Bold2.7

6.2Lists2.6

0.16Emoji0.00

1.90Headings2.08

0.03Transitions0.07

Based on 23 + 25 text responses

Research

What we learned reading every model

GPT-5.3-Codex and Sonar Pro Search 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

Sonar Pro Search vs MiniMax M3New provider

Sonar Pro Search vs Claude Opus 4New provider

Sonar Pro Search vs Gemini 2.5 Pro Preview 06-05New provider

Updated Feb 2026

Our Verdict

GPT-5.3-Codex

Sonar Pro SearchRunner-up

No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

GPT-5.3-Codex

Input

$1.75

1.7× cheaper

Output

$14.00

1.1× cheaper

Sonar Pro Search

Input

$3.00

Output

$15.00

GPT-5.3-Codex is cheaper on both — 1.7× input, 1.1× output

Writing DNA

Style Comparison

Similarity

72%

GPT-5.3-Codex uses 15.8x more emoji

GPT-5.3-Codex

Sonar Pro Search

65%Vocabulary60%

23wSentence Length22w

0.51Hedging0.30

6.5Bold2.7

6.2Lists2.6

0.16Emoji0.00

1.90Headings2.08

0.03Transitions0.07

Based on 23 + 25 text responses

Research

What we learned reading every model

GPT-5.3-Codex and Sonar Pro Search 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

Sonar Pro Search vs MiniMax M3New provider

Sonar Pro Search vs Claude Opus 4New provider

Sonar Pro Search vs Gemini 2.5 Pro Preview 06-05New provider