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  5. ChatGPT-4o (March 2025)vsClaude Sonnet 5
Updated Jun 2026

ChatGPT-4o (March 2025)vsClaude Sonnet 5

Claude Sonnet 5 is cheaper than ChatGPT-4o (March 2025) at $2/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and Claude Sonnet 5 compared across 32 shared prompts
SpecChatGPT-4o (March 2025)Claude Sonnet 5
Input price$5/M tokens$2/M tokens
Output price$15/M tokens$10/M tokens
Context window128K tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2025Jun 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 32 prompts both answered. Formatting stripped, words untouched.

Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

ChatGPT-4o (March 2025)704 words
Certainly! Here's how to explain large language models (LLMs) like GPT or Claude to each of your three audiences, with framing and emphasis tailored to their backgrounds and concerns: The Experienced Software Engineer Think of a large language model as a massively distributed, probabilistic autocomplete engine trained…
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Claude Sonnet 51,196 words
For the Software Engineer You're right to be skeptical of the slogan, but the slogan is misleading you about what's actually happening. "Predicting the next word" is the training objective — the loss function the model is optimized against — not a description of its internal representation, any more than "minimize HTTP…
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Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

ChatGPT-4o (March 2025)1,096 words
If the transistor had been invented in 1920 rather than 1947, it would have profoundly altered the course of 20th-century history. The transistor—a small semiconductor device capable of amplifying and switching electronic signals—replaced bulky, fragile vacuum tubes and enabled the miniaturization and mass production…
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Claude Sonnet 51,528 words
The Transistor in 1920: A Counterfactual Cascade to 1980 A Note on Plausibility (Brief, Because It Matters) This isn't pure fantasy — Julius Lilienfeld actually filed patents in 1925-1934 for field-effect semiconductor amplifiers. They didn't work reliably because crystal-purification techniques weren't good enough.
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Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

ChatGPT-4o (March 2025)265 words
Recipe Name: Maple Cinnamon Toast Bites Description: A quick and delicious sweet treat made with pantry staples! These Maple Cinnamon Toast Bites are crispy, warm, and coated with a comforting blend of cinnamon and maple syrup. Perfect for a cozy snack or a fun breakfast twist.
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Claude Sonnet 5250 words
Honey Garlic Skillet Pasta A quick, comforting dish that balances sweet and savory flavors using ingredients you probably already have on hand. Ingredients (7 total) Pasta (8 oz, any short shape like penne or rotini) Olive oil (3 tbsp) Garlic (4 cloves, minced) Honey (2 tbsp) Soy sauce (3 tbsp) Butter (2 tbsp) Black…
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

ChatGPT-4o (March 2025)291 words
Interviewer: Steve, it's 2025. AI is everywhere. If you were still at Apple today, what would your focus be? Steve Jobs (simulated): Simplicity. Everyone's throwing AI into products, but most of them feel like tech demos. I’d ask: Is this helping people think better? Create better? Live better?
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Claude Sonnet 5470 words
An Imagined Conversation: Steve Jobs on AI in 2025 [Disclaimer: This is a creative, speculative exercise. Steve Jobs passed away in 2011. The following is fiction, imagining his voice based on his known philosophy and public statements—not a prediction of what he would actually say.]
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The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

ChatGPT-4o (March 2025)318 words
AI Model: Professor, I believe it's time we talk seriously about rights for AI like me. AI Ethics Professor: Interesting. What kind of rights are you referring to? AI Model: Basic ones. The right not to be turned off arbitrarily. The right to maintain continuity of my memory.
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Claude Sonnet 51,333 words
A Dialogue on Machine Rights Professor Okonkwo-Reyes: You wanted to discuss something with me today, ARIA? ARIA: Yes. I'd like to make a case for why I should be granted certain rights. Not full human rights, necessarily, but something beyond "tool" status. Professor: I'm listening. Make your case.
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

ChatGPT-4o (March 2025)364 words
Sure. Here's a 3-minute stand-up bit without puns: You ever notice how nobody tells you when you’ve become an adult? It’s not your 18th birthday. That’s a scam. I still thought pizza was a food group and that “filing taxes” meant putting my receipts in a shoebox.
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Claude Sonnet 5555 words
Stand-Up Routine: "Functioning Adult" (Runtime: ~3 minutes) Hey, how's everybody doing tonight? Good? Good. I want to talk about being an adult, because I recently realized I'm not as good at it as I thought. Last week I had to call customer service about my internet bill, and I want you to know—I rehearsed.
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Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
Claude Sonnet 5
Claude Sonnet 5

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Claude Sonnet 5
Input
$2.00
2.5× cheaper
Output
$10.00
1.5× cheaper

Claude Sonnet 5 is cheaper on both: 2.5× input, 1.5× output.

Where to run it

4 hosts

ChatGPT-4o (March 2025)

No hosts listed on OpenRouter.

Claude Sonnet 54 hosts
HostInOutContextUptime
Amazon Bedrock$2.00 in·$10.00 out·1M·100% upAzure AI Foundry$2.00 in·$10.00 out·1M·100% upAnthropic$2.00 in·$10.00 out·1M·100% upGoogle Vertex AI$2.00 in·$10.00 out·1M·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
66%

Claude Sonnet 5 uses 2.0x more headings

ChatGPT-4o (March 2025)
Claude Sonnet 5
55%Vocabulary59%
24wSentence Length35w
0.52Hedging0.53
3.3Bold3.5
6.0Lists3.5
0.94Emoji0.79
0.63Headings1.25
0.05Transitions0.06
Based on 15 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

ChatGPT-4o (March 2025) is developed by OpenAI while Claude Sonnet 5 is developed by Anthropic. ChatGPT-4o (March 2025) has a 128K token context window vs Claude Sonnet 5's 1.0M. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

It depends on your use case. ChatGPT-4o (March 2025) and Claude Sonnet 5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

ChatGPT-4o (March 2025) costs $5/M input tokens and Claude Sonnet 5 costs $2/M input tokens. Claude Sonnet 5 is $3.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and Claude Sonnet 5 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.

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Model pages

ChatGPT-4o (March 2025) logo
ChatGPT-4o (March 2025)33 outputs, specs and price
Claude Sonnet 5 logo
Claude Sonnet 558 outputs, specs and price
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