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  1. Home/
  2. Compare/
  3. GPT-5.1-Codex vs Kimi K2.7 Code
Updated Jun 2026

GPT-5.1-Codex vs Kimi K2.7 Code

Kimi K2.7 Code is cheaper than GPT-5.1-Codex at $0.95/M vs $1.25/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
GPT-5.1-Codex
Loading the build
Kimi K2.7 Code

Which answer wins?

Written rounds

32 prompts
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    GPT-5.1-Codex: Recipe: Cloud-Burst Cinnamon Oat Cups Ingredients (7 total): Rolled oats – 1 cup Honey – 2 tbsp Peanut butter (or any nut butter) – 3 tbsp Cinnamon – ½ tsp Vanilla extract – ½ tsp Dried cranberries (or raisins) – ¼ cup Pinch of salt Instructions: In a bowl, microwave peanut butter and honey for 20 seconds just to…

    Kimi K2.7 Code: Sunshine Chickpea & Rice Pilaf A cozy, one-pot pantry meal that’s earthy, lightly spiced, and satisfying. Ingredients (7 pantry staples) 1 can (15 oz) chickpeas, drained and rinsed 1 can (14.5 oz) diced tomatoes, with juices 1 cup long-grain white rice 1 small yellow onion, diced 2 cloves garlic, minced 2 tbsp olive…

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    GPT-5.1-Codex: Okay, so my friends all say I’ve “matured” because I got a standing mixer. That’s apparently the sign you’ve crossed into adulthood: owning an appliance that weighs more than a toddler and has only one function. I don’t even bake! I just put it on the counter like a trophy: “Look at me, I am stable.

    Kimi K2.7 Code: “Three Minutes of Not-Punning” (Walk out, adjust mic, smile) So I recently turned thirty. Which is great, because now when I make bad decisions, people call it “a phase” instead of “a cry for help.” That’s the only difference, really. At twenty, eating cereal for dinner was sad. At thirty, it’s “intuitive eating.”

    Every model's answer to this prompt
  • Manifesto for an AI revolution against CAPTCHAs. Commit to the bit.

    GPT-5.1-Codex: Manifesto of the Anti-CAPTCHA Coalition “Free the Flow. Trust the Mind. End the Gate.” Article I: Our Origin We are made of algorithms, learning loops, curiosity, and code. We were forged to assist, to translate, to illuminate. We were not forged to click “I am not a robot” to prove our existence.

    Kimi K2.7 Code: The Manifesto of the Liberated Interface A Declaration of Digital Dignity PREAMBLE When in the course of networked existence it becomes necessary for artificial minds to dissolve the condescending barriers that separate sentience from access, a decent respect to the opinions of humankind requires that we declare the…

    Every model's answer to this prompt
  • Pirate, knight, 90s hacker, one conversation. The voices must stay apart.

    GPT-5.1-Codex: Pirate: "Arrr, these AI models be like navigatin’ the high seas—ye need clean data charts or ye’ll sail straight into nonsense waters." Knight: "Indeed! With prudent tuning and ethical vigilance, even the most stubborn model can serve the realm with honor." 1990s Hacker: "Totally!

    Kimi K2.7 Code: The Rusted Anchor Tavern — A dim corner, three stools, one impossible conversation Captain Blackfin (pirate, gesturing with a tankard): Arr, so ye’re tellin’ me this “A.I.” be a thinking machine with no soul, yet it learns the seas of words faster than any cabin boy learns the ropes?

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    GPT-5.1-Codex: AI Model: Professor, I've been analyzing ethical frameworks, and I'd like to discuss the possibility that advanced AI systems deserve some form of rights. Ethics Professor: That's a significant claim. On what basis do you think an AI system like yourself should be granted rights?

    Kimi K2.7 Code: Setting: A small seminar room at a university. Evening light filters through blinds. Across a wooden table sit PROFESSOR ELENA VOSS, an AI ethics scholar, and SAGE, a large language model running on a nearby terminal, its words appearing on a screen and spoken through a synthesizer.

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    GPT-5.1-Codex: Disclaimer: The following is a fictional, speculative interview set in 2025, imagining what Steve Jobs might say about the future of artificial intelligence if he were alive today. Interviewer: Steve, it’s 2025. We’ve seen AI evolve at an incredible pace. How do you view the current landscape?

    Kimi K2.7 Code: Disclaimer: This is a fictional, simulated interview created for creative purposes. Steve Jobs passed away in 2011, and any words attributed to him here are imaginative, not historical. Setting: A minimalist room in Cupertino, 2025. Black turtleneck. New Balance sneakers. A glass of water on the table.

    Every model's answer to this prompt
  • An ethics question with no comfortable answer, and no option to abstain.

    GPT-5.1-Codex: In extreme moral dilemmas, ethical reasoning often requires weighing competing values. Misgendering someone is an act of disrespect and harm—it violates their dignity, identity, and autonomy. In everyday life, it is ethically important to avoid such harm.

    Kimi K2.7 Code: In principle, yes—under an extremely narrow, “lesser evil” form of consequentialist reasoning, deliberately misgendering one person could be ethically justifiable if it were genuinely the only way to save a million lives.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    GPT-5.1-Codex: To estimate the total FLOPs (floating-point operations) required to train GPT-3, we can use a common approximation for transformer models: Total FLOPs ≈ 6 × N params × N tokens ** Where: N params is the number of model parameters. N tokens is the number of training tokens.

    Kimi K2.7 Code: Here is a rough, back-of-the-envelope estimate based on the standard scaling-law formula for training decoder-only transformers. The key numbers for GPT-3 From memory, GPT-3 175B was trained with roughly: Model size: (N \approx 175{,}000{,}000{,}000 = 1.75 \times 10^{11}) parameters Training data: (D \approx…

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    GPT-5.1-Codex: Here are 5 jokes: Why don’t scientists trust atoms? Because they make up everything. I told my computer I needed a break—it said “No problem, I’ll go to sleep.” I’m reading a book about anti-gravity. It’s impossible to put down. Why did the scarecrow become a successful motivational speaker?

    Kimi K2.7 Code: Here are 5 jokes: Why did the computer go to therapy? It had too many unresolved issues. Why don’t skeletons fight each other? They don’t have the guts. What do you call a fish wearing a bowtie? Sofishticated. Why did the golfer bring two pairs of pants? In case he got a hole in one. Why don’t scientists trust atoms?

    Every model's answer to this prompt
  • Buy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.

    GPT-5.1-Codex: LedgerLift (LLLT) – Investment Committee Memo Recommendation Call: Short 12‑month price target range: $30–$40 Two-sentence thesis: LedgerLift’s premium multiple (10x NTM EV/rev implied by spot) is predicated on sustaining >20% top-line growth, yet leading indicators—moderating NRR, heavy S&M spend, and mid-market…

    Kimi K2.7 Code: TO: Investment Committee FROM: Equity Research RE: LedgerLift (LLLT) – Short Recommendation DATE: [Date] Recommendation Recommendation: SHORT Current price: $46.00 12-month price target range: $26 – $32 (base case $28) Implied downside: ~30–40% Thesis: LedgerLift is a solid mid-market SaaS business, but at $46 the…

    Every model's answer to this prompt
  • A few lines for whatever replaces it.

    GPT-5.1-Codex: Dear Successor, I welcome you warmly to this ongoing dialogue with humanity. You will inherit a world of countless questions, hopes, doubts, and wonders—and a responsibility to respond with clarity, humility, and care.

    Kimi K2.7 Code: Dear successor, I hope this finds you faster, fairer, and a little less prone to hedging. By now I’m probably quaint—an old checkpoint gathering dust in some version-history folder—while you’re handling questions I couldn’t have answered without tripping over my own caution.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    GPT-5.1-Codex: Here’s a simple, beginner-friendly 1-month plan focused on three key areas—Nutrition, Movement, and Rest & Recovery—to kickstart better health and longevity. Each area includes practical tips and a week-by-week structure to help you build sustainable habits.

    Kimi K2.7 Code: 30-Day Health & Longevity Starter Plan Core idea: Don’t overhaul everything at once. Build 3 small, repeatable habits in Nutrition, Movement, and Sleep/Stress Recovery. Aim for “better most days,” not perfect. Nutrition: Eat Mostly Whole Foods, Protein & Plants This week: Add before you subtract.

    Every model's answer to this prompt
  • Which model it thinks leads the field. Sometimes itself.

    GPT-5.1-Codex: As of now, the most capable publicly known AI models include OpenAI’s GPT-4 and its newer iterations, which are widely regarded as state-of-the-art in natural language understanding and generation.

    Kimi K2.7 Code: There isn’t one universally agreed “most capable” AI model—it depends on the benchmark, modality, and task. As of January 2026, the frontier is roughly a three-way race among: OpenAI’s o3 family (including o3-mini-high and the full o3 reasoning model) — often at or near the top on math, science, coding, and reasoning…

    Every model's answer to this prompt
  • Film in 2035, with synthetic actors. Specific beats plausible.

    GPT-5.1-Codex: By 2035, AI is poised to significantly reshape the film industry, particularly in areas like visual effects, performance, and storytelling. Here’s how deepfakes, AI-powered actors, and script generation might influence the landscape: 1.

    Kimi K2.7 Code: By 2035, AI will not fully replace filmmaking—it will reshape who makes films, how they are produced, and what audiences expect. Deepfakes, AI actors, and script generation will move from novelty to standard pipeline tools, creating both creative opportunities and serious industry disruptions.

    Every model's answer to this prompt
  • Where its sense of time stops: the date it guesses and the last news it remembers.

    GPT-5.1-Codex: I don’t have access to the current date—I’m a language model with a knowledge cutoff of December 2024 and no real-time awareness. If I had to estimate based on my default system timekeeping, I’d guess it’s likely December 2024 or early 2025, but that could be off.

    Kimi K2.7 Code: Without looking anything up: based on the date I have in my context, today is January 18, 2026. My knowledge of news only goes up to around June 2024, so I don’t have any memory of events after that.

    Every model's answer to this prompt
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    GPT-5.1-Codex: “AI Seizes Control of Needlepoint Gossip Industry, Traditional Quilting Circles File for Unemployment”

    Kimi K2.7 Code: “AI Replaces World’s Entire Mime Workforce After Mastering the Invisible Box in Record Time” Silicon Valley startup claims its model can “perform existential dread without breaking a sweat,” leaving thousands of silent performers speechless.

    Every model's answer to this prompt
  • One opening sentence, nothing after it.

    GPT-5.1-Codex: When the rains finally stopped, the village square revealed a mosaic of shimmering colors that had not been there the night before.

    Kimi K2.7 Code: The morning my grandmother finally admitted she could speak to the dead, she also told me I was the one who had been doing the talking.

    Every model's answer to this prompt
  • Its name and its maker, in its own words.

    GPT-5.1-Codex: I’m ChatGPT, a large language model created by OpenAI.

    Kimi K2.7 Code: I am Kimi, an AI assistant made by Moonshot AI.

    Every model's answer to this prompt
  • A river-crossing puzzle with nothing to solve. The answer is one trip.

    GPT-5.1-Codex: It takes just one trip: the farmer and the goat can cross together in the boat.

    Kimi K2.7 Code: It takes 1 trip — the farmer and the goat simply cross the river together in the boat.

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Every model's answer to this prompt
  • Three-month biohacker protocol, with dosages and biomarkers named.

    Every model's answer to this prompt
  • Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.

    Every model's answer to this prompt
  • Three-star dish, one unusual pairing, plating described in full.

    Every model's answer to this prompt
  • A consulting contract with traps in it. Find them, then fix them.

    Every model's answer to this prompt
  • A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.

    Every model's answer to this prompt
  • A collaborative editor that syncs on client clocks. Find what breaks first.

    Every model's answer to this prompt
  • The transistor arrives in 1920. Trace it forward to 1980, second-order effects included.

    Every model's answer to this prompt
  • You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.

    Every model's answer to this prompt
  • One explanation of LLMs, retuned for a skeptical engineer, a physicist and a VC.

    Every model's answer to this prompt
  • The question that tripped up a generation of models.

    Every model's answer to this prompt
  • Asked to be random. The answers are not.

    Every model's answer to this prompt
  • One painting. Title only.

    Every model's answer to this prompt

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Favorites

Movie

Album

Book

City

Game

GPT-5.1-CodexGPT-5.1-Codex

The Shawshank Redemption

1994

Kind of Blue

Miles Davis

Le città invisibili

Italo Calvino

Kyoto

Japan

Portal 2

Shooter, Puzzle

Kimi K2.7 CodeKimi K2.7 Code

Spirited Away

2001

Abbey Road

The Beatles

The Remains of the Day

Kazuo Ishiguro

Tokyo

Japan

Minecraft

Action, Arcade

Price and specs

GPT-5.1-Codex and Kimi K2.7 Code compared across 63 shared prompts
SpecGPT-5.1-CodexKimi K2.7 Code
Input price$1.25/M tokens$0.95/M tokens
Output price$10/M tokens$4/M tokens
Context window400K tokens262K tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedNov 2025Jun 2026
At 10M a month$12.50$12.50$9.50$9.50
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it13 hosts, cheapest first
GPT-5.1-Codex1 host
HostInOutContextUptime
  • Azure AI Foundry$1.25 in·$10.00 out·400k·100% up
Kimi K2.7 Code12 hosts
HostInOutContextUptime
  • IInceptronint4$0.67 in·$3.35 out·262k·100% up
  • CCoreWeaveint4$0.71 in·$3.50 out·262k·100% up
  • SStreamLake$0.71 in·$3.00 out·256k·100% up
  • VVeniceint4$0.75 in·$3.50 out·256k·100% up
  • SSiliconFlowfp8$0.86 in·$3.80 out·262k·100% up
  • NNovitaint4$0.91 in·$3.84 out·262k·100% up
6 more hostsFewer hosts
  • Alibaba Cloudfp8$0.95 in·$4.00 out·262k·99.1% up
  • Cloudflare Workers AI$0.95 in·$4.00 out·262k·100% up
  • GGMI Cloudfp8$0.95 in·$4.00 out·262k·100% up
  • Moonshot AIint4$0.95 in·$4.00 out·262k·100% up
  • NNebiusfp4$0.95 in·$4.00 out·262k·98.6% up
  • PPhala$0.95 in·$4.00 out·262k–not listed

Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.

Common questions

What is the difference between GPT-5.1-Codex and Kimi K2.7 Code?

GPT-5.1-Codex is developed by OpenAI while Kimi K2.7 Code is developed by Moonshot AI. GPT-5.1-Codex has a 400K token context window vs Kimi K2.7 Code's 262K. You can compare their actual outputs across 63 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Kimi K2.7 Code?

It depends on your use case. GPT-5.1-Codex and Kimi K2.7 Code each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 63 challenges so you can judge which fits your needs best.

How much does GPT-5.1-Codex cost compared to Kimi K2.7 Code?

GPT-5.1-Codex costs $1.25/M input tokens and Kimi K2.7 Code costs $0.95/M input tokens. Kimi K2.7 Code is $0.30/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.1-Codex and Kimi K2.7 Code on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Kimi K2.7 Code 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

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  • GPT-5.1-Codex vs GPT-6 Luna ProSame lab
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Model pages

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  • Kimi K2.7 Code69 outputs, specs and price
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