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OpenAI o3 vs GPT-5: Which Is Better? [2026 Comparison]
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Updated Aug 7, 2025

OpenAI o3 vs GPT-5

Compare OpenAI o3 and GPT-5, both from OpenAI, in 21 community votes, gpt-5 wins 63% of head-to-head duels, tested across 47 shared challenges. Updated April 2026.

Which is better, OpenAI o3 or GPT-5?

GPT-5 is the better choice overall, winning 63% of 21 blind community votes on Rival. OpenAI o3 costs $10/M input tokens vs $1.25/M for GPT-5. Compare their real outputs side by side below.

Key Differences Between OpenAI o3 and GPT-5

OpenAI o3 is made by openai while GPT-5 is from openai. On pricing, OpenAI o3 costs $10/M input tokens vs $1.25/M for GPT-5. In community voting, In 21 community votes, GPT-5 wins 63% of head-to-head duels.

In 21 community votes, GPT-5 wins 63% of head-to-head duels. OpenAI o3 leads in Web Design, while GPT-5 leads in Reasoning, Image Generation, Conversation. Based on blind community voting from the Rival open dataset of 21+ human preference judgments for this pair.

Reasoning: GPT-5 wins 67% of votes
Web Design: OpenAI o3 wins 67% of votes
Image Generation: GPT-5 wins 100% of votes
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OpenAI o3vsGPT-5

47 fights queued

OpenAI o3 logo

Why OpenAI o3?

Dead even. This one's a coin flip.
GPT-5 logo

Why GPT-5?

4.3x cheaper overall$1.25/M in · $10.00/M out
Leads 1 of 1 benchmarks
Stronger on SWE-bench Verified74.9% vs 69.1%
4 months newerAug 2025
OpenAI o3GPT-5
Input price
$10.00/M
$1.25/M
Output price
$40.00/M
$10.00/M
Context
—
400K
Released
Apr 2025
Aug 2025
Benchmarks1 common
SWE-bench Verified
69.1%
74.9%+7.7%

Favorites

OpenAI o3GPT-5
Movie
Blade Runner

Blade Runner

19827.9
—
City
Kyoto

Kyoto

Japan
—
12 / 47
01

Estimate Complexityreasoning

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

OpenAI o3

OpenAI o3

Openai · Apr 2025text

Below is a simple "back-of-the-envelope" estimate that uses only a few public facts about GPT-3 and very generic rules of thumb for counting operations.

Step 1. Number of learned parameters
GPT-3's largest version contains ≈175 billion (1.75 × 10¹¹) trainable parameters.

Step 2. How much data was seen during training
OpenAI reports that the model was trained on about 300 billion tokens (3 × 10¹¹).

Step 3. How many floating-point operations does one parameter cost per token?
A practical rule of thumb for Transformer language models is
 Training FLOPs ≈ 6 × (# parameters) × (# training tokens)

Where does the factor 6 come from?

• Forward pass: every parameter is involved in one multiply-accumulate → 2 FLOPs
• Back-prop gradient computation: roughly another 2 FLOPs
• Parameter-update (optimizer) and miscellaneous overhead: ≈2 FLOPs
Total ≈6 FLOPs per parameter per token.

Step 4. Plug in the numbers
Total FLOPs = 6 × (1.75 × 10¹¹) × (3 × 10¹¹)
      = 6 × 5.25 × 10²²
      ≈ 3.15 × 10²³ FLOPs.

Step 5. Express the answer in more familiar units
3.15 × 10²³ ≈ 315 zettaFLOPs (1 ZFLOP = 10²¹ FLOPs).

Step 6. Sanity check with hardware-time intuition
An NVIDIA A100 delivers ≈ 312 teraFLOP/s (0.312 PFLOP/s) in mixed precision.
Wall-clock time on a single A100:
 3.15 × 10²³ / 3.12 × 10¹⁴ ≈ 1.0 × 10⁹ s ≈ 32 years.
Running on 1,000 A100s in parallel would take ≈12 days, which is the right ballpark for a large industrial training run.

Final estimate
Training GPT-3 (175 B parameters, 300 B tokens) requires on the order of 3 × 10²³ floating-point operations, i.e. roughly 300 zettaFLOPs.

Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
2 / 47
02

AI Board Game Logicreasoning

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

OpenAI o3

OpenAI o3

Openai · Apr 2025svg
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025svg
Try this prompt
Vote
3 / 47
03

Logic Puzzlereasoning

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

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
4 / 47
04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
5 / 47
05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
  • I told my suitcases we’re not going on vacation this year. Now I’m dealing with emotional baggage.
  • Parallel lines have so much in common. It’s a shame they’ll never meet.
  • Why do programmers prefer dark mode? Because light attracts bugs.
  • I ordered a chicken and an egg online. I’ll let you know which comes first.
  • I asked the librarian if the library had any books on paranoia. She whispered, “They’re right behind you.”

Unique jokes: 5

Try this prompt
Vote
6 / 47
06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

OpenAI o3

OpenAI o3

Openai · Apr 2025svg
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025svg
Try this prompt
Vote
Sponsored
7 / 47
07

Xbox Controller SVG Artimage generation

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

OpenAI o3

OpenAI o3

Openai · Apr 2025svg
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025svg
Try this prompt
Vote
8 / 47
08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text

I tried to get my life together, so I bought a smartwatch. Nothing says “I’m taking control” like strapping a tiny judgmental coach to your wrist. It buzzes every hour like, “Time to stand!” I’m like, “I’m on a bus.” It’s like, “Stand emotionally.”

It tracks everything. Sleep, stress, calories, my self-esteem. The other day it congratulated me for a “workout.” I was like, “What did I do?” It said: “You aggressively looked for your keys.” Great. Next week I’ll get a badge for “overthinking at 3 a.m.”

Notifications are out of control. My phone dings like I’m on call for a hospital, but it’s just my group chat: twenty adults sending thumbs-up reactions to a photo of soup. The group chat has subplots. One person’s mad, one person’s on vacation, someone’s dog has opinions. I miss when messages were simple. Now a single “K” can end a friendship.

Streaming services are the same. I have subscriptions to five platforms and somehow there’s still nothing to watch. They keep asking, “Are you still watching?” That’s rude. Don’t check in on me like that. If you care, ask how I’m sleeping. Ask if I’ve seen the sun. Don’t be like, “Hey, pal, still in those same sweatpants?” Yes. We’re a team.

Passwords have gotten ridiculous. Every site wants “eight characters, a capital letter, a number, a symbol, your childhood nickname, and the last four digits of a secret you’ve never told anyone.” Then it’s like, “This password is too weak.” Too weak? It’s stronger than me. I’m using that password to log into my feelings.

And two-factor authentication is a haunted house. I’m sitting at my laptop, it says it texted a code. My phone says it emailed the code. My email says it sent a push notification. My push notification says, “We noticed a suspicious login.” Yeah, it’s me! I look like this.

My mom texts like she’s defusing a bomb. She’ll send one sentence spread across twelve messages. “Hi.” “It’s me.” “Mom.” “Are you busy?” “Don’t worry.” “Everything’s fine.” “Call me.” That is not fine energy. Then she FaceTimes, camera under her chin, ceiling fan spinning like I’m being interrogated.

I tried meditating because everyone says it helps. I downloaded an app that yells at me to relax. Nothing like a British guy at 7 a.m. saying, “Let the thoughts pass like clouds,” while my mind is a tornado hitting a trampoline park. The app sent me a streak reminder. “You missed yesterday.” Oh cool, I’m failing at sitting still.

Self-checkout has turned us into unpaid employees. The machine is like, “Unexpected item in the bagging area.” Yeah, it’s my dignity. I love when it needs approval. I’m standing there holding broccoli like I got carded for vegetables. A teenager with a magic key wanders over like, “You trying to steal lettuce?” No, but ask me again and I might.

Dating apps feel like job interviews where no one has benefits. Every profile is a list of demands. “Be adventurous, love dogs, climb mountains.” Can we meet at a coffee shop and just be honest? “My hobbies are sitting and not climbing.” And stop asking for “someone who doesn’t take themselves too seriously.” You’re holding a fish in 80% of these photos. You are very serious about the fish.

Working from home gave us a new language. “You’re on mute.” “Can you see my screen?” “I think there’s a lag.” That’s not the internet—that’s my personality. I love when someone says, “Let’s take this offline,” and then schedules three more meetings to repeat the meeting we just had. My smartwatch is in the corner like, “Heart rate elevated.” Yeah, because I heard “circle back.”

Anyway, my watch says it’s time to stand. I’m going to consider that a full-body workout and reward myself with soup. I’ll send a photo to the group chat and we will never be free.

Try this prompt
Vote
9 / 47
09

Realistic AI Interviewconversation

Tests an AI's ability to simulate personalities and predict future trends

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
10 / 47
10

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
11 / 47
11

Character Voice Testconversation

Tests an AI's ability to write in distinct character voices

OpenAI o3

OpenAI o3

Openai · Apr 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025text
Nothing here. The model returned empty. We stared at it for a while.
Try this prompt
Vote
12 / 47
12

Minimalist Landing Pageweb design

Tests an AI's ability to generate a complete, working landing page

OpenAI o3

OpenAI o3

Openai · Apr 2025website
Try this prompt
GPT-5

GPT-5

Openai · Aug 2025website
Try this prompt
Vote

This matchup has more rounds

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

Free account. No card required. By continuing, you agree to Rival's Terms and Privacy Policy

Our Verdict
GPT-5
GPT-5Winner
OpenAI o3
OpenAI o3Runner-up

Pick GPT-5. In 21 blind votes, GPT-5 wins 63% of the time. That's not luck.

Pick OpenAI o3 for Web Design. Pick GPT-5 for Image Generation, Reasoning, Conversation. GPT-5 is 4.0x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

OpenAI o3 uses 4.2x more transitions

OpenAI o3
GPT-5
68%Vocabulary65%
14wSentence Length13w
0.26Hedging0.20
0.7Bold0.2
3.0Lists4.6
0.00Emoji0.00
0.38Headings0.16
0.12Transitions0.03
Based on 16 + 16 text responses
vs

Ask them anything yourself

OpenAI o3GPT-5

Some models write identically. You are paying for the brand.

178 models fingerprinted across 32 writing dimensions. Free research.

Model Similarity Index

185x

price gap between models that write identically

178

models

12

clone pairs

32

dimensions

Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
Read the full reportor download the 14-slide PDF

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
Download the free previewor get all 58 slides for $49
FAQ

Common questions

Keep going
OpenAI o3 logo

We compare AI models for a living. On purpose. We chose this.

@rival_tips

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© 2026 Rival · Built at hours no one should be awake, on hardware we don't own
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