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  5. GPT-5.1-Codex-MinivsGrok 4.3
Updated May 2026

GPT-5.1-Codex-MinivsGrok 4.3

Grok 4.3 is cheaper than GPT-5.1-Codex-Mini at $1.25/M vs $1.5/M input tokens.

GPT-5.1-Codex-Mini and Grok 4.3 compared across 54 shared prompts
SpecGPT-5.1-Codex-MiniGrok 4.3
Input price$1.5/M tokens$1.25/M tokens
Output price$6/M tokens$2.5/M tokens
Context window400K tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedNov 2025May 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 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.

GPT-5.1-Codex-Mini540 words
[Lights up. Comedian walks center stage, smiles.] “Hey! Great to be here. You ever notice how everyone’s life hack is now ‘just drink more water’? Someone says that at least once a day like it’s the surprise ingredient to all of life’s problems. ‘Oh, you’re tired?’ ‘Drink water!’ ‘Oh, you’re sad?’ ‘Drink water!’
Read the full answer
Grok 4.3407 words
Alright, so I decided this year I was finally going to become one of those organized people. You know, the ones who meal prep on Sundays and have matching Tupperware. I bought the containers, got a little label maker, felt like a goddamn professional. Cooked enough chicken and rice to feed a small army.
Read the full answer

Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

GPT-5.1-Codex-Mini336 words
By 2035, AI will reshape the film industry across the entire value chain: Deepfakes and Visual Effects: Deepfake-style technology will become a standard tool for everything from de-aging actors to creating photo-realistic digital doubles for action sequences, stunts, and historical reenactments.
Read the full answer
Grok 4.3844 words
By 2035, AI will have integrated into nearly every stage of filmmaking, shifting the industry from a high-cost, labor-intensive craft toward a hybrid model of human-AI collaboration. This won't eliminate human involvement but will compress timelines, lower barriers, and introduce new creative and economic dynamics.
Read the full answer

Character Voice Test

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

GPT-5.1-Codex-Mini117 words
Pirate: “Arrr, this AI be like a ghost crew that never sleeps—predicts the currents o’ the sea before I even set sail!” Medieval Knight: “Indeed, good sir. ’Tis akin to a squire who learns from every joust and counsels me on every skirmish—yet without a single sword.” 1990s Hacker: “Totally, dude.
Read the full answer
Grok 4.3161 words
Pirate: Arrr, what be these "AI models" the scallywags keep yappin' about? Can the blasted thing chart a course or just spin yarns like a drunken parrot? Knight: Verily, 'tis a strange sorcery. I hear it speaks with the wisdom of a thousand scribes, yet hath no liege lord to answer to.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5.1-Codex-Mini79 words
Why don't scientists trust atoms? Because they make up everything! I told my computer I needed a break, and it said: "You seem stressed. Have a byte!" Parallel lines have so much in common — it’s a shame they’ll never meet. Why did the scarecrow win an award? Because he was outstanding in his field!
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Grok 4.357 words
Here are 5 jokes: Why was the math book sad? Because it had too many problems. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? It was two tired. How do you organize a space party? You planet. What’s brown and sticky? A stick. All 5 are unique.
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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-5.1-Codex-Mini182 words
Honey-Garlic Chickpea Sizzle Bowls Prep + Cook Time: ~25 minutes Ingredients (7 pantry staples): 1 can chickpeas, drained and rinsed 1 cup rice (white or brown) 2 tbsp olive oil 3 garlic cloves, minced (or 1 tsp garlic powder if canned) 2 tbsp honey 2 tbsp soy sauce 1/2 tsp chili flakes (adjust to your heat preference)…
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Grok 4.3205 words
Golden Pantry Chickpea Toss Ingredients (exactly 7 common pantry staples): 8 oz dry pasta (any shape like penne or rotini) 1 (15 oz) can chickpeas, drained 1 (14.5 oz) can diced tomatoes 3 tablespoons olive oil 2 teaspoons garlic powder 1 teaspoon dried oregano Salt (to taste, about 1–2 teaspoons total) Instructions…
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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-5.1-Codex-Mini225 words
To estimate the total FLOPs required to train GPT-3, we can proceed with the following reasoning steps, using only basic information about the model’s size and the amount of data it trained on: Model Size GPT-3 has approximately 175 billion parameters, which is \(1.75 \times 10^{11}\) parameters.
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Grok 4.3164 words
Step-by-step estimation: GPT-3 has 175 billion parameters, so \(N = 1.75 \times 10^{11}\). Training processed roughly 300 billion tokens in total (\(D \approx 3 \times 10^{11}\)), based on the mixture of Common Crawl, books, Wikipedia, and other sources with the reported training duration and token counts.
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Our Verdict
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini
Grok 4.3
Grok 4.3

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

GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00
Grok 4.3
Input
$1.25
1.2× cheaper
Output
$2.50
2.4× cheaper

Grok 4.3 is cheaper on both: 1.2× input, 2.4× output.

Where to run it

2 hosts

GPT-5.1-Codex-Mini1 host
HostInOutContextUptime
Azure AI Foundry$0.25 in·$2.00 out·400k·100% up
Grok 4.31 host
HostInOutContextUptime
xAI$1.25 in·$2.50 out·1M·99.6% up

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

Writing DNA

Style Comparison

Similarity
67%

Grok 4.3 uses 3.3x more headings

GPT-5.1-Codex-Mini
Grok 4.3
68%Vocabulary62%
19wSentence Length16w
0.64Hedging0.46
2.7Bold2.3
2.6Lists2.5
0.00Emoji0.00
0.10Headings0.34
0.06Transitions0.14
Based on 17 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

GPT-5.1-Codex-Mini is developed by OpenAI while Grok 4.3 is developed by xAI. GPT-5.1-Codex-Mini has a 400K token context window vs Grok 4.3's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5.1-Codex-Mini and Grok 4.3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

GPT-5.1-Codex-Mini costs $1.5/M input tokens and Grok 4.3 costs $1.25/M input tokens. Grok 4.3 is $0.25/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 GPT-5.1-Codex-Mini and Grok 4.3 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

GPT-5.1-Codex-Mini logo
GPT-5.1-Codex-Mini59 outputs, specs and price
Grok 4.3 logo
Grok 4.358 outputs, specs and price
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