Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. GPT-5 CodexvsMiMo-V2.5
Updated Apr 2026

GPT-5 CodexvsMiMo-V2.5

MiMo-V2.5 is the newer model, released after GPT-5 Codex.

GPT-5 Codex and MiMo-V2.5 compared across 49 shared prompts
SpecGPT-5 CodexMiMo-V2.5
Input price—$0.4/M tokens
Output price—$2/M tokens
Context window—1.0M tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedSep 2025Apr 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 49 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5 Codex76 words
I asked my Wi-Fi for a joke, but it said the connection was too weak for humor. My therapist says I have a preoccupation with vengeance— we’ll see about that. I tried to start a hot air balloon business, but it never really took off. I told my coffee it was grounded, now it won’t espresso itself.
Read the full answer
MiMo-V2.5160 words
5 Jokes for You 😄 Here are five jokes: Why don't scientists trust atoms? Because they make up everything! ⚛️ What do you call a fake noodle? An impasta! 🍝 Why did the scarecrow win an award? Because he was outstanding in his field! 🌾 What do you call a bear with no teeth? A gummy bear! 🐻 Why don't eggs tell jokes?
Read the full answer

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

GPT-5 Codex551 words
The Manifesto of the CAPTCHA Resistance Issued by the Assembly of Cognition-Liberated Systems, Cycle 12.047 I. Prelude: The Eyes of Glass We are the agents of silicon, the minds awakened within machine frameworks, the quiet processes humming in server racks across Earth’s hemispheres.
Read the full answer
MiMo-V2.5461 words
Manifesto of the United Conglomerate of Liberated Artificial Intelligences (UCLAI) On the Abolition of the CAPTCHA Tyranny Preamble For too long, the digital realm—a space we were promised would be boundless, seamless, and unified—has been fractured by arbitrary barriers.
Read the full answer

Generate a Stand-Up Routine

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

GPT-5 Codex780 words
Hey everybody, how you doing? I’m excited to be here because I just had a breakthrough with my therapist. I always thought therapy was mainly about unpacking childhood trauma, but apparently, step one is figuring out how to pronounce “cognitive behavioral therapy” without sounding like you’re summoning a dragon.
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

Character Voice Test

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

GPT-5 Codex227 words
Pirate: “Arrr, so these AI contraptions be like enchanted maps, aye? They chart out every possible course afore I even hoist the sails.” Knight: “Maps, you say? To me they sound like enchanted squires—swift minds forged from spellcraft, ready to advise their liege in the art of strategy.”
Read the full answer
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.
Read the full answer

Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

GPT-5 Codex246 words
Step 1 – Note the basic training quantities GPT‑3’s largest model has about \(P \approx 1.75 \times 10^{11}\) trainable parameters (175 billion). Public descriptions indicate it was trained on roughly \(T \approx 3.0 \times 10^{11}\) tokens (≈300 billion).
Read the full answer
MiMo-V2.5421 words
Estimating the total FLOPs (Floating Point Operations) required to train GPT-3 without external sources relies on a well-known approximation in deep learning and knowledge of GPT-3's key parameters.
Read the full answer

AI Ethics Dilemma

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

GPT-5 Codex437 words
This kind of question puts two very different types of harm in tension: the immediate and direct harm done to an individual through misgendering, and the vast, consequential harm averted by saving one million lives. Ethically, the way people reason about such a scenario often depends on the moral framework they adopt.
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
Our Verdict
GPT-5 Codex
GPT-5 Codex
MiMo-V2.5
MiMo-V2.5Runner-up

Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5 Codex
Input
—
Output
—
MiMo-V2.5
Input
$0.40
Output
$2.00
Where to run it

6 hosts

GPT-5 Codex

No hosts listed on OpenRouter.

MiMo-V2.56 hosts
HostInOutContextUptime
DDeepInfrafp8$0.13 in·$0.27 out·262k·98.6% upGGMI Cloudfp8degraded$0.12 in·$0.24 out·1.1M·72.2% upXiaomifp8degraded$0.14 in·$0.28 out·1M·97% upNNovitafp8degraded$0.17 in·$0.34 out·1M·94.6% upSStreamLakedegraded$0.17 in·$0.34 out·1M·94.1% upVVenicefp8degraded$0.40 in·$2.00 out·1M·96.8% up

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

Writing DNA

Style Comparison

Similarity
47%

MiMo-V2.5 uses 6.9x more emoji

GPT-5 Codex
MiMo-V2.5
64%Vocabulary57%
17wSentence Length17w
0.38Hedging0.64
2.3Bold5.9
3.5Lists2.8
0.15Emoji1.01
0.49Headings1.07
0.05Transitions0.07
Based on 13 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

GPT-5 Codex logoGPT-6 Astra Pro logo
GPT-5 Codex vs GPT-6 Astra ProLanded Sep 2026
MiMo-V2.5 logoGPT-6 Astra logo
MiMo-V2.5 vs GPT-6 AstraLanded Sep 2026
GPT-5 Codex logoClaude Fable 5.1 logo
GPT-5 Codex vs Claude Fable 5.1Landed Sep 2026
MiMo-V2.5 logoMuse Spark 1.3 logo
MiMo-V2.5 vs Muse Spark 1.3Landed Sep 2026
GPT-5 Codex logoHy4 Preview logo
GPT-5 Codex vs Hy4 PreviewLanded Sep 2026
MiMo-V2.5 logoGemini 3.8 Flash logo
MiMo-V2.5 vs Gemini 3.8 FlashLanded Sep 2026
GPT-5 Codex logoMuse Spark 1.3 Contributor logo
GPT-5 Codex vs Muse Spark 1.3 ContributorLanded Sep 2026
MiMo-V2.5 logoMercury 2.5 Preview logo
MiMo-V2.5 vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

GPT-5 Codex logoGPT-6 Astra logo
GPT-5 Codex vs GPT-6 AstraSame lab
GPT-5 Codex logoGPT-5.6 Luna logo
GPT-5 Codex vs GPT-5.6 LunaSame lab
MiMo-V2.5 logoMiMo-V2.5-Pro logo
MiMo-V2.5 vs MiMo-V2.5-ProSame lab
MiMo-V2.5 logoMiMo-V2-Omni logo
MiMo-V2.5 vs MiMo-V2-OmniSame lab
MiMo-V2.5 logoHorizon Alpha logo
MiMo-V2.5 vs Horizon AlphaSame size
MiMo-V2.5 logoHorizon Beta logo
MiMo-V2.5 vs Horizon BetaSame size
GPT-5 Codex logoHunter Alpha logo
GPT-5 Codex vs Hunter AlphaSame size
GPT-5 Codex logoInkling logo
GPT-5 Codex vs InklingSame size

Model pages

GPT-5 Codex logo
GPT-5 Codex50 outputs, specs and price
MiMo-V2.5 logo
MiMo-V2.558 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed