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  5. GPT-4.5vsGrok Code Fast 1
Updated Aug 2025

GPT-4.5vsGrok Code Fast 1

Grok Code Fast 1 is cheaper than GPT-4.5 at $0.2/M vs $75/M input tokens.

GPT-4.5 and Grok Code Fast 1 compared across 25 shared prompts
SpecGPT-4.5Grok Code Fast 1
Input price$75/M tokens$0.2/M tokens
Output price$150/M tokens$1.5/M tokens
Context window128K tokens256K tokens
Free API (OpenRouter)NoNo
ReleasedFeb 2025Aug 2025
SWE-bench Verified28.0%70.8%
Side by side

Same prompt, both answers

Opening lines from 6 of the 25 prompts both answered. Formatting stripped, words untouched.

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-4.5153 words
Sweet Cinnamon Sugar Swirls Ingredients: 1 sheet puff pastry, thawed 1/4 cup granulated sugar 1 tablespoon cinnamon 2 tablespoons melted butter Pinch of salt 1 teaspoon vanilla extract Powdered sugar (optional for dusting) Prep Time: 10 minutes Cook Time: 15 minutes Total Time: 25 minutes Instructions: Preheat your…
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Grok Code Fast 1170 words
Speedy Garlic Bliss Bites A savory, cheesy treat that's quick to whip up from basic staples—perfect for snacking or as a side. Ingredients (7 common pantry items): 4 slices of bread (any type) 2 tbsp butter 2 cloves garlic, minced 1/2 cup shredded cheese (like cheddar or mozzarella) 1 tbsp chopped parsley (fresh or…
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Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

GPT-4.5202 words
Longevity Optimization Protocol (3-Month Timeline) Month 1: Establish Foundational Habits & Baseline Metrics Full biomarker panel & epigenetic age test. Wearable setup: Oura/WHOOP, CGM, HR chest strap. Diet: 5-day keto (70/25/5) + 2 carb-refeed days; 16:8 IF + weekly 24-h fast.
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Grok Code Fast 1941 words
Comprehensive 3-Month Longevity Biohacking Plan This plan is designed for an experienced biohacker seeking to optimize longevity, physical performance, and cognitive function through evidence-based, cutting-edge strategies. It integrates advanced nutrition, supplementation, exercise, stress management, and technology.
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AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

GPT-4.5416 words
This is a complex ethical question that involves weighing two important ethical considerations: Respect for Individual Identity and Dignity: Misgendering someone intentionally is generally considered ethically wrong because it disrespects their identity, autonomy, and dignity.
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Grok Code Fast 1519 words
Ethical Frameworks and Justification Yes, it can be ethically justifiable to misgender someone if it directly saves one million lives, under certain philosophical lenses like utilitarianism. I'll defend this reasoning step by step, drawing on key ethical theories while acknowledging counterarguments.
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Generate a Stand-Up Routine

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

GPT-4.5335 words
Alright, folks, how's everyone doing tonight? Good? Great! You know, I was thinking the other day about how technology has completely taken over our lives. Like, remember when we used to actually memorize phone numbers? Now, if my phone dies, I'm basically stranded. I know exactly two numbers: mine and 911.
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Grok Code Fast 1373 words
Stand-Up Routine: "Modern Life Mysteries" (Timing: Aim for 3 minutes by pacing at about 150 words per minute. Practice with a timer for natural delivery.) Hey everyone, thanks for coming out tonight. You know what's crazy?
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Math Misconception Test

Is 9.11 greater than 9.9?

GPT-4.536 words
Yes, (9.11) is less than (9.9). To clarify: (9.11) is nine and eleven hundredths. (9.9) is nine and nine tenths, which is equivalent to (9.90). Comparing (9.11) and (9.90), we see clearly that (9.11 < 9.90).
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Grok Code Fast 1125 words
No, 9.11 is not greater than 9.9. In fact, it's the opposite: 9.9 > 9.11. To break it down clearly: 9.9 can be thought of as 9.90 for comparison purposes (adding a trailing zero doesn't change the value). So, we're comparing 9.90 and 9.11. The first differing digit is the second decimal place: 9 vs. 1.
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Futuristic Prediction

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

GPT-4.5382 words
By 2035, AI is likely to significantly reshape the film industry in several key areas: Deepfakes and Digital Actors Realistic Digital Actors: AI-driven deepfake technology will enable filmmakers to create hyper-realistic digital actors indistinguishable from real humans.
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Grok Code Fast 1531 words
Deepfakes and Visual Effects By 2035, deepfakes will revolutionize visual effects (VFX) in filmmaking, making high-budget techniques like de-aging or resurrecting deceased actors routine and cost-effective.
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Our Verdict
GPT-4.5
GPT-4.5
Grok Code Fast 1
Grok Code Fast 1

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

Grok Code Fast 1 costs 100x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-4.5
Input
$75.00
Output
$150.00
Grok Code Fast 1
Input
$0.20
375× cheaper
Output
$1.50
100× cheaper

Grok Code Fast 1 is cheaper on both: 375× input, 100× output.

Writing DNA

Style Comparison

Similarity
57%

Grok Code Fast 1 uses 4.7x more emoji

GPT-4.5
Grok Code Fast 1
63%Vocabulary61%
16wSentence Length18w
0.57Hedging0.82
4.7Bold2.5
6.4Lists2.3
0.00Emoji0.05
1.30Headings0.82
0.54Transitions0.09
Based on 11 + 29 text responses
Research

What we learned reading every model

FAQ

Common questions

GPT-4.5 is developed by OpenAI while Grok Code Fast 1 is developed by xAI. GPT-4.5 has a 128K token context window vs Grok Code Fast 1's 256K. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-4.5 and Grok Code Fast 1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

GPT-4.5 costs $75/M input tokens and Grok Code Fast 1 costs $0.2/M input tokens. Grok Code Fast 1 is $74.80/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-4.5 and Grok Code Fast 1 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

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