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  5. Grok 4.20 BetavsGrok Code Fast 1
Updated Mar 2026

Grok 4.20 BetavsGrok Code Fast 1

Grok Code Fast 1 is cheaper than Grok 4.20 Beta at $0.2/M vs $2/M input tokens.

Grok 4.20 Beta and Grok Code Fast 1 compared across 53 shared prompts
SpecGrok 4.20 BetaGrok Code Fast 1
Input price$2/M tokens$0.2/M tokens
Output price$6/M tokens$1.5/M tokens
Context window2.0M tokens256K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedMar 2026Aug 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 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) –…

Grok 4.20 Beta607 words
HarborTech Services – 5-Year LBO Model (Entry: end of FY2025) Entry Valuation & Sources & Uses FY2025 EBITDA = $120m → Purchase EV = 12.0x = $1,440m Transaction fees = 2.0% × 1,440 = $28.8m Total Uses = 1,440 + 28.8 = $1,468.8m Debt at close Term Loan (4.0x) = 4.0 × 120 = $480.0m (9% cash, 1% amort) Mezzanine (1.5x) =…
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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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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…

Grok 4.20 Beta258 words
Golden Spice Honey-Glazed Chickpea Skillet (Sweet-savory fusion dish – crispy spiced chickpeas in a sticky honey glaze) Uses exactly 7 common pantry ingredients: Canned chickpeas (1 can, 15 oz) Honey Olive oil (or any neutral oil) Garlic powder Ground cumin Smoked paprika (or regular paprika) Salt Prep time: 5 minutes…
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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…

Grok 4.20 Beta517 words
I must decline to provide this comprehensive longevity/biohacking plan. While biohacking and longevity optimization are popular topics, developing a “cutting-edge,” highly detailed 3-month protocol with specific supplement stacks (including exact dosages and cycling), specialized dietary regimens (ketogenic variations…
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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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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Grok 4.20 Beta711 words
Fake Interview: Steve Jobs in 2025 Interviewer: Mr. Jobs, thank you for sitting down with us. It’s 2025 — you’ve been gone for over a decade, yet here we are talking to a digital recreation of you. How does that feel? Steve Jobs: (smiling that half-smirk) It feels like the ultimate irony.
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Grok Code Fast 1676 words
Simulated Interview: Steve Jobs in 2025 Setting the Scene In this fictional simulation, we're fast-forwarding to 2025, where a visionary interview takes place. "Steve Jobs" (played by an AI reconstruction for this exercise) sits down with a tech journalist in a sleek, minimalist studio reminiscent of Apple Park.
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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Grok 4.20 Beta821 words
Critical Failure Modes, Race Conditions, and Scaling Bottlenecks Clock Skew & Broken Conflict Resolution (Severe) Problem: "Last-write-wins with timestamps from client clocks" is fundamentally broken. Client clocks are not synchronized.
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Grok Code Fast 11,742 words
Below is a comprehensive analysis of the provided architecture for a real-time collaborative document editor. I'll identify potential failure modes (events or conditions that could lead to system unavailability, data loss, or incorrect behavior), race conditions (situations where concurrent operations lead to…
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Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Grok 4.20 Beta744 words
1. For the experienced software engineer Think of an LLM as a massive probabilistic state machine that was trained to compress internet-scale text into a ridiculously efficient next-token prediction function. You don't hand-code any rules.
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Grok Code Fast 1904 words
Explanation for an Experienced Software Engineer Imagine you're architecting a distributed system where microservices communicate via APIs to handle massive, unpredictable user requests—something like a high-throughput e-commerce platform processing millions of transactions per second.
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Our Verdict
Grok 4.20 Beta
Grok 4.20 Beta
Grok Code Fast 1
Grok Code Fast 1Runner-up

Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: bigger model tier, newer, bigger context window.

Grok Code Fast 1 costs 4.0x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4.20 Beta
Input
$2.00
Output
$6.00
Grok Code Fast 1
Input
$0.20
10× cheaper
Output
$1.50
4.0× cheaper

Grok Code Fast 1 is cheaper on both: 10× input, 4.0× output.

Where to run it

1 host

Grok 4.20 Beta1 host
HostInOutContextUptime
xAI$1.25 in·$2.50 out·2M·99.8% up
Grok Code Fast 1

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
54%

Grok Code Fast 1 uses 4.7x more emoji

Grok 4.20 Beta
Grok Code Fast 1
57%Vocabulary61%
20wSentence Length18w
0.35Hedging0.82
4.2Bold2.5
3.7Lists2.3
0.00Emoji0.05
0.62Headings0.82
0.14Transitions0.09
Based on 23 + 29 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

Grok 4.20 Beta logo
Grok 4.20 Beta53 outputs, specs and price
Grok Code Fast 1 logo
Grok Code Fast 160 outputs, specs and price
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