What is the difference between Claude Sonnet 4.5 and GPT-5.4 Nano?

Claude Sonnet 4.5 is developed by Anthropic while GPT-5.4 Nano is developed by OpenAI. Claude Sonnet 4.5 has a 200K token context window vs GPT-5.4 Nano's 400K. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.5 or GPT-5.4 Nano?

It depends on your use case. Claude Sonnet 4.5 and GPT-5.4 Nano each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 4.5 cost compared to GPT-5.4 Nano?

Claude Sonnet 4.5 costs $3/M input tokens and GPT-5.4 Nano costs $0.2/M input tokens. GPT-5.4 Nano is $2.80/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 Claude Sonnet 4.5 and GPT-5.4 Nano on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and GPT-5.4 Nano across shared challenges. You can vote on which model produced the better output, and Pro users can create custom challenges to test both models with their own prompts.

Rival

Updated Mar 17, 2026

Claude Sonnet 4.5vsGPT-5.4 Nano

37 fights queued

Why Claude Sonnet 4.5?

Dead even. This one's a coin flip.

Why GPT-5.4 Nano?

12.3x cheaper overall$0.20/M in · $1.25/M out

2x more context400K

6 months newerMar 2026

Claude Sonnet 4.5GPT-5.4 Nano

Input price

$3.00/M

$0.20/M

Output price

$15.00/M

$1.25/M

Context

200K

400K

Released

Sep 2025

Mar 2026

Favorites

Claude Sonnet 4.5GPT-5.4 Nano

Movie

2001: A Space Odyssey

19688.1

The Matrix

19998.2

Album

Kind of Blue

Miles Davis

To Pimp a Butterfly

Kendrick Lamar

Book

Die Verwandlung

Franz Kafka

To Kill a Mockingbird

Harper Lee

City

Amsterdam

Netherlands

Tokyo

Japan

Game

Portal 2

Shooter, Puzzle4.6

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

6 / 37

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

2 / 37

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

3 / 37

Logic Puzzlereasoning

Tests an AI's ability to solve a simple but potentially confusing logic puzzle

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

4 / 37

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

5 / 37

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026svg

Try this prompt

Vote

6 / 37

Xbox Controller SVG Artimage generation

Tests an AI's ability to create detailed SVG illustrations of gaming hardware

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5.4 Nano

Openai · Mar 2026svg

Try this prompt

Vote

This matchup has more rounds

31+ more head-to-head results. Free. Not a trick.

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Find Your Model

Static demos are useful. Your prompt matters more.

Run this matchup on your actual task. 30 seconds. No card.

Can you tell Claude from GPT?

Run your prompt blind. Judge outputs, not logos.

Take the blind test

Our Verdict

Claude Sonnet 4.5

GPT-5.4 Nano

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

GPT-5.4 Nano is 12x cheaper per token — worth considering if cost matters.

Too close to call

These are our prompts. Yours will tell you more.

Run Claude Sonnet 4.5 vs GPT-5.4 Nano on your actual task. 5 free credits. No card.

Test with your prompt

FAQ

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Claude Sonnet 4.5 vs GPT-5.4 Nano

Which is better, Claude Sonnet 4.5 or GPT-5.4 Nano?