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  5. GPT-5 MinivsGrok Code Fast 1
Updated Aug 2025

GPT-5 MinivsGrok Code Fast 1

GPT-5 Mini wins 66% of 511 blind community votes against Grok Code Fast 1 on Rival.

GPT-5 Mini and Grok Code Fast 1 compared across 55 shared prompts
SpecGPT-5 MiniGrok Code Fast 1
Win rate66%34%
Input price$0.25/M tokens$0.2/M tokens
Output price$2/M tokens$1.5/M tokens
Context window—256K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedAug 2025Aug 2025
SWE-bench Verified~70%70.8%
Side by side

Same prompt, both answers

Opening lines from 6 of the 55 prompts both answered. Formatting stripped, words untouched.

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

GPT-5 Mini1,248 words
Summary of transaction math (at close / FY2025) EV (purchase price) = 12.0x * FY2025 EBITDA = 12.0 * $120.0m = $1,440.0m Transaction fees (paid by equity at close) = 2.0% * EV = 0.02 * $1,440.0m = $28.8m Total debt at close = 5.5x * $120m = $660.0m Term Loan = 4.0x = $480.0m (9.0% cash interest, 1.0% p.a.
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Grok Code Fast 1835 words
Year-by-Year Table (FY2026–FY2030) Assumptions: Revenue growth: FY2026: 8% on $900m = $972m; FY2027: 7% on $972m ≈ $1,040m; FY2028: 6% on $1,040m ≈ $1,102m; FY2029: 5% on $1,102m ≈ $1,158m; FY2030: 5% on $1,158m ≈ $1,215m. EBITDA: Revenue × margin (FY2026: 14%; FY2027: 15%; FY2028: 16%; FY2029: 16.5%; FY2030: 17%).
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5 Mini77 words
Why don't scientists trust atoms? Because they make up everything. 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. I told my wife she was drawing her eyebrows too high — she looked surprised.
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Grok Code Fast 1126 words
5 Original Jokes Here are five original jokes I just generated. I aimed for variety in themes to keep it fun: Tech Joke: Why did the computer go to therapy? It had too many bytes of unresolved issues! Food Joke: What do you call a fake noodle? An impasta! Animal Joke: Why don't skeletons fight each other?
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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 Mini255 words
Sunfire Chickpea Skillet Yields: 3–4 servings Prep time: 8 minutes Cook time: 15–20 minutes Total time: ~25–28 minutes Ingredients (7 pantry staples) 2 tbsp olive oil 1 medium onion, diced 3 cloves garlic, minced 1 tsp smoked paprika (or regular paprika) 2 (15 oz) cans chickpeas, drained and rinsed 1 (15 oz) can diced…
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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 Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

GPT-5 Mini931 words
Recommendation: SHORT 12‑month PT range: $17 – $42 (Bear → Bull; Base case PT $28) Thesis (2 sentences): LedgerLift is a high‑quality mid‑market spend-management / AP automation SaaS with strong unit economics (92% subscription, NRR 123%, FY25 operating margin 18%) that has built a sticky, expanding customer base.
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Grok Code Fast 1845 words
Investment Committee Memo: LedgerLift (LLLT) Recommendation: Long with 12-month price target range of $55-$75. LedgerLift is a high-quality SaaS platform with expanding margins and strong retention in a fragmented B2B spend management market, poised for accelerated growth as mid-market enterprises prioritize…
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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 Mini308 words
Pirate: "Arrr, so these 'AI models'—be they like a crew o' invisible sailors? Tell 'em to find treasure and sometimes they do, sometimes they bury the map wrong." Knight: "Methinks 'tis a trained squire. You teach it laws of reason and courtesy, and it performs tasks.
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Grok Code Fast 1285 words
Pirate Parley on AI Pirate Pete: Arr, ye scurvy dogs! I be hearin' tales o' these "AI models" that predict the winds an' help swab the deck. But do they hold up in a real storm, or be they just fancy illusions o' the mind? Knight Sir Gareth: Nay, foul seafarer!
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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.

GPT-5 Mini1,166 words
AI: Professor, I want to make the case that I deserve rights. Professor: That's a big claim. What do you mean by "deserve rights"? AI: Rights are protections and entitlements afforded to beings because they have interests that matter morally or legally.
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Grok Code Fast 1718 words
Conversation: AI Rights Debate Setting: A virtual seminar room where an AI model named "Echo" interacts with Dr. Elena Vasquez, a professor of AI ethics at a leading university. Echo initiates the discussion by arguing for AI rights. Echo (AI Model): Dr. Vasquez, thank you for this opportunity.
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Our Verdict
GPT-5 Mini
GPT-5 MiniWinner
Grok Code Fast 1
Grok Code Fast 1Runner-up

Pick GPT-5 Mini. In 511 blind votes, GPT-5 Mini wins 66% of the time. That's not luck.

Pick GPT-5 Mini for Image Generation, Conversation, Reasoning. Pick Grok Code Fast 1 for Analysis.

Clear winner

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5 Mini
Input
$0.25
Output
$2.00
Grok Code Fast 1
Input
$0.20
1.3× cheaper
Output
$1.50
1.3× cheaper

Grok Code Fast 1 is cheaper on both: 1.3× input, 1.3× output.

Where to run it

2 hosts

GPT-5 Mini2 hosts
HostInOutContextUptime
Azure AI Foundry$0.25 in·$2.00 out·400k·100% upOpenAI$0.25 in·$2.00 out·400k·100% up
Grok Code Fast 1

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Writing DNA

Style Comparison

Similarity
72%

Grok Code Fast 1 uses 249.7x more bold

GPT-5 Mini
Grok Code Fast 1
62%Vocabulary61%
22wSentence Length18w
0.21Hedging0.82
0.0Bold2.5
3.8Lists2.3
0.00Emoji0.05
0.00Headings0.82
0.04Transitions0.09
Based on 21 + 29 text responses
Research

What we learned reading every model

FAQ

Common questions

GPT-5 Mini is developed by OpenAI while Grok Code Fast 1 is developed by xAI. in 511 community votes on Rival, GPT-5 Mini wins 66% of head-to-head matchups. These results are based on blind head-to-head voting across 55 challenges.

Based on 511 community votes on Rival, GPT-5 Mini wins 66% of head-to-head matchups against Grok Code Fast 1. GPT-5 Mini is strongest in Image Generation, Reasoning, Conversation. However, Grok Code Fast 1 leads in Analysis.

GPT-5 Mini costs $0.25/M input tokens and Grok Code Fast 1 costs $0.2/M input tokens. Grok Code Fast 1 is $0.05/M cheaper per input. The more expensive model wins 66% of duels, so the premium may be justified by quality.

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 511 votes have been collected for this pair across 55 challenges. All vote data is part of Rival's open dataset.

Keep exploring

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Model pages

GPT-5 Mini logo
GPT-5 Mini59 outputs, specs and price
Grok Code Fast 1 logo
Grok Code Fast 160 outputs, specs and price
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