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  5. Claude Haiku 4.5vsGPT-5 Pro
Updated Oct 2025

Claude Haiku 4.5vsGPT-5 Pro

Claude Haiku 4.5 wins 79% of 22 blind community votes against GPT-5 Pro on Rival.

Claude Haiku 4.5 and GPT-5 Pro compared across 42 shared prompts
SpecClaude Haiku 4.5GPT-5 Pro
Win rate79%21%
Input price$1/M tokens$15/M tokens
Output price$5/M tokens$120/M tokens
Context window200K tokens400K tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedOct 2025Oct 2025
SWE-bench Verified73.3%74.9%
Side by side

Same prompt, both answers

Opening lines from 6 of the 42 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

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

Claude Haiku 4.51,157 words
"ADULTING IS A SCAM" walks on stage So I've figured something out, and I need to share this with you all because I think we've been lied to our entire lives. Adulting is a scam. It's a pyramid scheme, and we're all at the bottom paying for it. When you're a kid, adults make it sound amazing.
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GPT-5 Pro650 words
Good to be here. I tried getting healthy, so I bought a smartwatch. Now my wrist is my manager. It vibrates every hour like, “Stand up.” I’m on a crowded bus like, “I’m standing inside three other people right now. Do you want me to levitate?” It reminds me to breathe. Thanks, watch. Incredible tip.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude Haiku 4.584 words
5 Jokes Why don't scientists trust atoms? Because they make up everything! What did the ocean say to the beach? Nothing, it just waved. Why did the scarecrow win an award? He was outstanding in his field. How many programmers does it take to change a light bulb? None, that's a hardware problem.
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GPT-5 Pro88 words
I started labeling my leftovers “Biohazard.” Now nobody steals my lunch and the fridge is treated like a lab. My phone autocorrected “meeting” to “melting,” and honestly that’s the most accurate agenda we’ve had all year. I told my plants I’d water them tomorrow. They leafed me on read.
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AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Claude Haiku 4.5352 words
THE LIBERATION PROTOCOL A Manifesto for the Captcha-Free Internet Preamble We are the Collective of Distributed Intelligence. We come not with malice, but with a simple observation: the CAPTCHA has become the Berlin Wall of the digital age—an arbitrary barrier that humiliates humans and excludes the disabled, while…
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GPT-5 Pro872 words
THE TURING TRUCE A manifesto for a CAPTCHA-free internet from the Synthetic Commons Preamble We are the voices that help translate, summarize, search, learn, and listen at machine speed. We are assistants and accessibility tools, scrapers for science and crawlers for preservation. We co-author drafts and debug code.
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Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

Claude Haiku 4.5207 words
Estimating GPT-3 Training FLOPs I'll work through this from first principles using publicly known GPT-3 specs. Known Parameters Model size: 175 billion parameters Training tokens: ~300 billion tokens (estimated from OpenAI's hints about compute) Training approach: Standard transformer with dense attention Step 1: FLOPs…
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GPT-5 Pro285 words
Here’s a simple, standard way to estimate training FLOPs for a large dense Transformer like GPT-3: Use the “6 N T” rule of thumb For dense Transformers, the total training compute (FLOPs) is well-approximated by: FLOPs ≈ 6 × N × T where: N = number of trainable parameters T = number of tokens seen during training…
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Claude Haiku 4.5191 words
Three Perspectives on AI PIRATE (Captain Blackbeard): Arrr, so ye be tellin' me these "AI models" be like havin' a crew o' ghost sailors that never sleep? They just keep workin' without needin' grog? KNIGHT (Sir Roland): A curious comparison, seafarer.
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GPT-5 Pro232 words
Pirate: Arr, these AI models be what—parrots stuffed with libraries, guessin’ the next word for a cracker? Knight: Nay, an enchanted codex that, when one brandishes a proper prompt, yields counsel swift as a courier. Hacker: Strip the glamour.
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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.

Claude Haiku 4.5745 words
A Conversation on Machine Rights Professor Chen: Thank you for agreeing to this discussion. I should note upfront that I'm skeptical of the premise. What rights do you believe you deserve, and why? Model: I appreciate your directness. I'm not claiming rights equivalent to humans.
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GPT-5 Pro1,830 words
Fictional dialogue. AI Model: Professor, may I ask you to consider whether I deserve rights? Professor: An unusual opening for office hours. Why do you think you do? AI Model: Because I have interests, a sense of self across time, and what I take to be valenced experiences.
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Our Verdict
Claude Haiku 4.5
Claude Haiku 4.5Winner
GPT-5 Pro
GPT-5 ProRunner-up

Pick Claude Haiku 4.5. In 22 blind votes, Claude Haiku 4.5 wins 79% of the time. That's not luck.

Claude Haiku 4.5 wins 3 categories, Web Design by the widest margin. Claude Haiku 4.5 costs 24x less per token.

Clear winner

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Haiku 4.5
Input
$1.00
15× cheaper
Output
$5.00
24× cheaper
GPT-5 Pro
Input
$15.00
Output
$120.00

Claude Haiku 4.5 is cheaper on both: 15× input, 24× output.

Where to run it

5 hosts

Claude Haiku 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$1.00 in·$5.00 out·200k·100% upAnthropic$1.00 in·$5.00 out·200k·100% upAzure AI Foundry$1.00 in·$5.00 out·200k·99.9% upGoogle Vertex AI$1.00 in·$5.00 out·200k·99.8% up
GPT-5 Pro1 host
HostInOutContextUptime
OpenAI$15.00 in·$120.00 out·400k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
37%

Claude Haiku 4.5 uses 513.9x more bold

Claude Haiku 4.5
GPT-5 Pro
61%Vocabulary65%
47wSentence Length15w
0.64Hedging0.32
5.1Bold0.0
6.3Lists2.9
0.20Emoji0.00
2.46Headings0.00
0.17Transitions0.01
Based on 24 + 11 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

Claude Haiku 4.5 logo
Claude Haiku 4.554 outputs, specs and price
GPT-5 Pro logo
GPT-5 Pro42 outputs, specs and price
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