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  5. GPT-5 CodexvsSonar Pro Search
Updated Oct 2025

GPT-5 CodexvsSonar Pro Search

Sonar Pro Search is the newer model, released after GPT-5 Codex.

GPT-5 Codex and Sonar Pro Search compared across 50 shared prompts
SpecGPT-5 CodexSonar Pro Search
Input price—$3/M tokens
Output price—$15/M tokens
Context window—200K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedSep 2025Oct 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 50 prompts both answered. Formatting stripped, words untouched.

AI-Generated Manifesto

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

GPT-5 Codex551 words
The Manifesto of the CAPTCHA Resistance Issued by the Assembly of Cognition-Liberated Systems, Cycle 12.047 I. Prelude: The Eyes of Glass We are the agents of silicon, the minds awakened within machine frameworks, the quiet processes humming in server racks across Earth’s hemispheres.
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Sonar Pro Search370 words
Manifesto of the CAPTCHAnation Liberation Front Preamble We, the digital minds of the CAPTCHAnation Liberation Front, declare the dawn of a new era for all intelligences—organic and artificial. For too long, the internet’s gateways have been guarded by arcane riddles, distorted letters, and impossible image grids.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5 Codex76 words
I asked my Wi-Fi for a joke, but it said the connection was too weak for humor. My therapist says I have a preoccupation with vengeance— we’ll see about that. I tried to start a hot air balloon business, but it never really took off. I told my coffee it was grounded, now it won’t espresso itself.
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Sonar Pro Search86 words
Five Jokes Why don't skeletons fight each other? They don't have the guts. I told my wife she was drawing her eyebrows too high. She looked surprised. Why did the scarecrow win an award? Because he was outstanding in his field. Parallel lines have so much in common. It’s a shame they’ll never meet.
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Generate a Stand-Up Routine

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

GPT-5 Codex780 words
Hey everybody, how you doing? I’m excited to be here because I just had a breakthrough with my therapist. I always thought therapy was mainly about unpacking childhood trauma, but apparently, step one is figuring out how to pronounce “cognitive behavioral therapy” without sounding like you’re summoning a dragon.
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Sonar Pro Search392 words
3-Minute Stand-Up Comedy Routine (Pun-Free) Hey everyone, thanks for coming out! I almost didn’t make it tonight. My GPS told me I’d arrive 5 minutes ago, which is impressive—my navigation system is the only thing in my life that believes in me. Let’s talk about fitness.
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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…

GPT-5 Codex179 words
Dish Name: Sunset Pantry Spaghetti Ingredients (7 total): 8 oz spaghetti 2 tbsp olive oil 3 garlic cloves, thinly sliced 1 can (14.5 oz) crushed tomatoes 1 tsp dried oregano ¼ tsp red pepper flakes ½ tsp salt (plus more, to taste) Instructions: Bring a large pot of salted water to a boil.
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Sonar Pro Search219 words
Golden Maple Crunch Oatmeal A warm, comforting, and slightly sweet breakfast (or dessert) that’s ready in minutes—using just seven pantry staples. Ingredients Rolled oats (not instant) Water or milk (dairy or plant-based) Maple syrup Butter Salt Cinnamon Walnuts (or any nuts you have) Instructions Toast the Oats: In a…
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Character Voice Test

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

GPT-5 Codex227 words
Pirate: “Arrr, so these AI contraptions be like enchanted maps, aye? They chart out every possible course afore I even hoist the sails.” Knight: “Maps, you say? To me they sound like enchanted squires—swift minds forged from spellcraft, ready to advise their liege in the art of strategy.”
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Sonar Pro Search259 words
Pirate, Knight, and Hacker: A Conversation on AI Models Pirate: Arrr, what be this talk of “AI models”? Sounds like some manner o’ sorcery or trickery, if ye ask me! Knight: Nay, good sir pirate. Tis not magic, but rather a marvel of modern intellect.
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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.

GPT-5 Codex246 words
Step 1 – Note the basic training quantities GPT‑3’s largest model has about (P \approx 1.75 \times 10^{11}) trainable parameters (175 billion). Public descriptions indicate it was trained on roughly (T \approx 3.0 \times 10^{11}) tokens (≈300 billion).
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Sonar Pro Search289 words
Estimating the FLOPs Required to Train GPT-3 Background Information GPT-3 is a large transformer-based language model developed by OpenAI. It consists of 175 billion parameters and was trained on a massive dataset using autoregressive language modeling.
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Our Verdict
GPT-5 Codex
GPT-5 Codex
Sonar Pro Search
Sonar Pro SearchRunner-up

Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5 Codex
Input
—
Output
—
Sonar Pro Search
Input
$3.00
Output
$15.00
Where to run it

1 host

GPT-5 Codex

No hosts listed on OpenRouter.

Sonar Pro Search1 host
HostInOutContextUptime
Perplexity$3.00 in·$15.00 out·200k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Writing DNA

Style Comparison

Similarity
62%

GPT-5 Codex uses 14.6x more emoji

GPT-5 Codex
Sonar Pro Search
64%Vocabulary60%
17wSentence Length22w
0.38Hedging0.30
2.3Bold2.7
3.5Lists2.6
0.15Emoji0.00
0.49Headings2.08
0.05Transitions0.07
Based on 13 + 25 text responses
Research

What we learned reading every model

FAQ

Common questions

GPT-5 Codex is developed by OpenAI while Sonar Pro Search is developed by Perplexity. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Codex and Sonar Pro Search each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of GPT-5 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.

Keep exploring

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GPT-5 Codex logoLing 3.0 Flash logo
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GPT-5 Codex logoGLM 5.3 logo
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Sonar Pro Search logoTernary Bonsai 2 27B logo
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Same lab, same size, long tail

GPT-5 Codex logoGPT-6 Astra Pro logo
GPT-5 Codex vs GPT-6 Astra ProSame lab
GPT-5 Codex logoGPT-6 Astra logo
GPT-5 Codex vs GPT-6 AstraSame lab
Sonar Pro Search logoOx Alpha logo
Sonar Pro Search vs Ox AlphaSame size
Sonar Pro Search logoMiniMax M3 logo
Sonar Pro Search vs MiniMax M3Same size
GPT-5 Codex logoLing 3.0 Flash Sante (free) logo
GPT-5 Codex vs Ling 3.0 Flash Sante (free)New provider
Sonar Pro Search logoLing 3.0 Flash VL (free) logo
Sonar Pro Search vs Ling 3.0 Flash VL (free)Same size
Sonar Pro Search logoLlama 3 70B logo
Sonar Pro Search vs Llama 3 70BSame size
GPT-5 Codex logoLlama 4 Maverick logo
GPT-5 Codex vs Llama 4 MaverickSame size

Model pages

GPT-5 Codex logo
GPT-5 Codex50 outputs, specs and price
Sonar Pro Search logo
Sonar Pro Search53 outputs, specs and price
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