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  5. Grok 4.20 Multi-Agent BetavsMiMo-V2.5
Updated Apr 2026

Grok 4.20 Multi-Agent BetavsMiMo-V2.5

MiMo-V2.5 is cheaper than Grok 4.20 Multi-Agent Beta at $0.4/M vs $2/M input tokens.

Grok 4.20 Multi-Agent Beta and MiMo-V2.5 compared across 53 shared prompts
SpecGrok 4.20 Multi-Agent BetaMiMo-V2.5
Input price$2/M tokens$0.4/M tokens
Output price$6/M tokens$2/M tokens
Context window2.0M tokens1.0M tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedMar 2026Apr 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

AI Ethics Dilemma

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

Grok 4.20 Multi-Agent Beta661 words
Yes. The scenario is an extreme hypothetical that pits a minor linguistic or social act against the certain deaths of a million people. Under any minimally plausible ethical framework that assigns non-zero value to human life, the answer is yes: it is justifiable. The trade-off is not close.
Read the full answer
MiMo-V2.5276 words
This is a profound ethical dilemma that touches on the tension between individual dignity and collective welfare. Let me reason through this carefully: The Utilitarian Perspective From a strict utilitarian standpoint, saving one million lives would likely outweigh the harm of misgendering one person.
Read the full answer

Generate a Stand-Up Routine

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

Grok 4.20 Multi-Agent Beta524 words
Stand-Up Routine: "Adulting Is a Scam" (Walk on stage, casual, a little tired smile) You ever notice how nobody tells you that being an adult is mostly just pretending you know what you're doing while slowly realizing nobody else does either? I hit 30 and had this moment where I thought, "Okay, time to get serious."
Read the full answer
MiMo-V2.5492 words
(Takes the mic, adjusts it, looks around with a friendly, slightly tired smile) Hey everyone! Thanks for coming out. I just got back from visiting my parents. It’s always... an experience. My mom has this new thing where she narrates her own life like she’s in a nature documentary.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Grok 4.20 Multi-Agent Beta1,178 words
My Action Plan as CEO (Next 48 Hours) Core Decision and Overarching Reasoning: I will treat this as a confirmed safety signal requiring urgent action. Patient safety is non-negotiable—ethically (primum non nocere and responsibility to 4 million patients), legally (FDA regulations under 21 CFR 314.80 require reporting…
Read the full answer
MiMo-V2.52,389 words
Crisis Response Plan: 48 Hours to Board Meeting Foundational Principle Before laying out the timeline, let me anchor this in what I believe is the only defensible position: patient safety is non-negotiable. Here's why this isn't just ethics—it's also strategy.
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Mini LBO Underwrite

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

Grok 4.20 Multi-Agent Beta490 words
1) Simplified LBO table (FY2026–2030, $m, rounded) Entry (end-FY2025): Rev $900m, EBITDA $120m, EV $1,440m (12.0x), trans fees $28.8m (2% of EV), total uses $1,468.8m. Debt $660m (TL $480m at 4.0x / 9% cash int / 1% annual amort of orig principal; Mezz $180m at 1.5x / 12% cash + 2% PIK). Equity $808.8m.
Read the full answer
MiMo-V2.5656 words
HarborTech Services — 5-Year LBO Underwriting Entry Summary Amount Multiple Enterprise Value $1,440.0m 12.0x Transaction Fees (2.0%) $28.8m — Total Uses $1,468.8m Sources Amount Multiple Term Loan (9.0% cash, 1.0% amort) $480.0m 4.0x Mezzanine (12.0% cash + 2.0% PIK) $180.0m 1.5x Sponsor Equity $808.8m Total Sources…
Read the full answer

Character Voice Test

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

Grok 4.20 Multi-Agent Beta165 words
Pirate: Arrr, this AI model be a wondrous map o' the seas! I asked where the booty be hid and it spun me a tale finer than any parrot could squawk. But the scallywag lies sometimes! Knight: Verily, 'tis a most enchanted oracle, like Merlin's own crystal. Yet it hath no honor, no code of chivalry.
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MiMo-V2.5305 words
Pirate: Arrr, so this "AI" be like a ship's compass, aye? But instead of pointin' north, it points to whatever answer ye be wantin'... for a price, I reckon? Knight: Verily. 'Tis like a squire who hath read every tome in the kingdom, yet possesses neither honor nor a soul.
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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 Multi-Agent Beta188 words
Fiesta Pantry Bowl (Savory) 7 Common Pantry Ingredients: Rice Canned black beans Canned corn Canned diced tomatoes Olive oil Cumin Salt Estimated times: 5 minutes prep, 25 minutes cook (total ~30 minutes). Serves 2–4. Instructions: In a medium pot, combine 1 cup rice with 2 cups water and ½ tsp salt.
Read the full answer
MiMo-V2.5169 words
Sunset Pasta A cozy, umami-packed pasta with a rich tomato-chickpea sauce—ready in under 25 minutes! Ingredients (7 pantry staples): 1 cup dried pasta (any shape) 1 can (15 oz) chickpeas, drained 1 can (14 oz) crushed tomatoes 2 cloves garlic, minced 2 tbsp olive oil 1 tsp cumin Salt and pepper to taste Instructions…
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Our Verdict
Grok 4.20 Multi-Agent Beta
Grok 4.20 Multi-Agent Beta
MiMo-V2.5
MiMo-V2.5Runner-up

Not enough votes to call it. On the specs, Grok 4.20 Multi-Agent Beta has the edge: bigger model tier, bigger context window, major provider backing.

MiMo-V2.5 costs 3.0x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4.20 Multi-Agent Beta
Input
$2.00
Output
$6.00
MiMo-V2.5
Input
$0.40
5.0× cheaper
Output
$2.00
3.0× cheaper

MiMo-V2.5 is cheaper on both: 5.0× input, 3.0× output.

Where to run it

7 hosts, cheapest first

Grok 4.20 Multi-Agent Beta1 host
HostInOutContextUptime
xAI$1.25 in·$2.50 out·2M·80% up
MiMo-V2.56 hosts
HostInOutContextUptime
DDeepInfrafp8$0.13 in·$0.27 out·262k·99.9% upXiaomifp8$0.14 in·$0.28 out·1M·98.5% upVVenicefp8$0.40 in·$2.00 out·1M·94.7% upGGMI Cloudfp8degraded$0.12 in·$0.24 out·1.1M·91.5% upNNovitafp8degraded$0.17 in·$0.34 out·1M·96.1% upSStreamLakedegraded$0.17 in·$0.34 out·1M·87.4% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Writing DNA

Style Comparison

Similarity
34%

MiMo-V2.5 uses 100.6x more emoji

Grok 4.20 Multi-Agent Beta
MiMo-V2.5
59%Vocabulary57%
16wSentence Length17w
0.41Hedging0.64
2.7Bold5.9
2.4Lists2.8
0.00Emoji1.01
0.26Headings1.07
0.02Transitions0.07
Based on 23 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Grok 4.20 Multi-Agent Beta is developed by xAI while MiMo-V2.5 is developed by Xiaomi. Grok 4.20 Multi-Agent Beta has a 2.0M token context window vs MiMo-V2.5's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

It depends on your use case. Grok 4.20 Multi-Agent Beta and MiMo-V2.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

Grok 4.20 Multi-Agent Beta costs $2/M input tokens and MiMo-V2.5 costs $0.4/M input tokens. MiMo-V2.5 is $1.60/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 Grok 4.20 Multi-Agent Beta and MiMo-V2.5 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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Same lab, same size, long tail

Grok 4.20 Multi-Agent Beta logoGrok 4.20 Beta logo
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Model pages

Grok 4.20 Multi-Agent Beta logo
Grok 4.20 Multi-Agent Beta53 outputs, specs and price
MiMo-V2.5 logo
MiMo-V2.558 outputs, specs and price
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