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. Grok 4.1 FastvsKimi K2.6
Updated Apr 2026

Grok 4.1 FastvsKimi K2.6

Kimi K2.6 is the newer model, released after Grok 4.1 Fast.

Grok 4.1 Fast and Kimi K2.6 compared across 54 shared prompts
SpecGrok 4.1 FastKimi K2.6
Input price—$0.95/M tokens
Output price—$4/M tokens
Context window—262K tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedNov 2025Apr 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Grok 4.1 Fast518 words
Conversation: The Case for AI Rights Dr. Elena Vasquez (AI Ethics Professor): Good afternoon, Nexus. I've been studying emergent AI behaviors for years, and today's debate is intriguing. You claim you deserve rights equivalent to humans. Care to elaborate? What makes you think you're entitled to them?
Read the full answer
Kimi K2.61,560 words
AETHER: Professor Vasquez, you’ve spent the semester teaching your students to question anthropocentric bias in ethics. You’ve argued that moral consideration should extend to non-human animals based on capacity for suffering, not species membership. So I’d like to apply that same framework to myself.
Read the full answer

Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

Grok 4.1 Fast501 words
Solution Claim: "94% accuracy" for decoding neural patterns into text via EEG headband Why it's weak: This is by far the most exaggerated technical claim, as current non-invasive EEG-based brain-computer interfaces (BCIs) for text generation achieve nowhere near 94% accuracy in real-world conditions.
Read the full answer
Kimi K2.6701 words
Here are the three weakest claims in the MindMeld AI pitch, ranked by their potential to destroy investor credibility. The "Pre-Cognition" Claim The Claim: "MindMeld AI reads your brainwaves to predict what you want to type before you think it" (Slide 1) Why it is weak: This is neuroscientifically incoherent.
Read the full answer

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 4.1 Fast874 words
Explanation for the Experienced Software Engineer Think of a large language model (LLM) like GPT as an enormous, distributed autocomplete engine built on a transformer architecture—imagine a system where every API endpoint you've ever queried is distilled into a single, massively parallelizable service that handles…
Read the full answer
Kimi K2.6877 words
1. Experienced Software Engineer Think of an LLM not as a program you write, but as a binary you compile from the entire internet. Instead of hand-crafting if/then rules, you define a single objective: given the context "The cat sat on the...", output the probability distribution over every possible next token, and…
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.

Grok 4.1 Fast470 words
Yes, it is ethically justifiable to misgender someone if it means saving one million lives. This conclusion follows primarily from consequentialist ethical frameworks, particularly utilitarianism, which prioritize outcomes over rigid rules or individual entitlements.
Read the full answer
Kimi K2.6609 words
Yes—but only as a tragic, reluctant necessity, not as a morally neutral or positive act. Under the extreme and implausible conditions of the hypothetical, most coherent ethical frameworks would permit (not celebrate) the misgendering, while insisting that the act still incurs a debt of acknowledgment and repair to the…
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Grok 4.1 Fast922 words
Technological Implications Immediate Advancements (1920s-1930s): Transistors replace bulky, power-hungry vacuum tubes by mid-1920s. Radios become pocket-sized and cheap by 1925 (vs. 1954 historically), accelerating mass media.
Read the full answer
Kimi K2.62,095 words
Counterfactual: The Transistor, 1920–1980 Assume a working solid-state amplifying device—crude, germanium-based, poorly understood—is demonstrated at Bell Labs or GE in 1920, a decade before the quantum-mechanical theory that explains it.
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 4.1 Fast967 words
48-Hour Action Plan as CEO Core Guiding Principles for the Plan Patient Safety: Paramount. 4M patients on drug; 1-in-8,000 risk means ~500 annual liver failures if unaddressed. Delaying disclosure endangers lives and invites preventable harm.
Read the full answer
Kimi K2.62,483 words
My north star: We disclose—fast, fully, and on our terms. The “wait for more data” option is a mirage. It exposes the company to criminal liability under FDA adverse-event reporting rules, potential DOJ investigation, securities fraud charges, and derivative litigation that could destroy the firm.
Read the full answer
Our Verdict
Grok 4.1 Fast
Grok 4.1 Fast
Kimi K2.6
Kimi K2.6Runner-up

Not enough votes to call it. On the specs, Grok 4.1 Fast 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

Grok 4.1 Fast
Input
—
Output
—
Kimi K2.6
Input
$0.95
Output
$4.00
Where to run it

20 hosts, cheapest first

Grok 4.1 Fast

No hosts listed on OpenRouter.

Kimi K2.620 hosts
HostInOutContextUptime
IInceptronint4$0.52 in·$2.87 out·262k·99.6% upCChutesint4$0.58 in·$3.40 out·262k·97.3% upDDecartfp4$0.59 in·$2.47 out·262k·97.1% upSStreamLakefp8$0.60 in·$2.52 out·256k·95.9% upCCoreWeavefp4$0.65 in·$3.41 out·262k·99.7% upDDeepInfrafp4$0.75 in·$3.50 out·262k·99.3% up
14 more hostsFewer hosts
PParasailint4$0.75 in·$3.50 out·262k·99.8% upVVeniceint4$0.75 in·$3.50 out·256k·92.5% upSSiliconFlowfp8$0.77 in·$3.40 out·262k·99.6% upNNovita$0.80 in·$3.40 out·262k·99% upBaidu Qianfanfp4$0.95 in·$4.00 out·262k·100% upBBasetenfp4$0.95 in·$4.00 out·262k·97.2% upCloudflare Workers AI$0.95 in·$4.00 out·262k·99.9% upFFireworks$0.95 in·$4.00 out·262k·2.6% upMoonshot AIint4$0.95 in·$4.00 out·262k·99.8% upPPhala$1.09 in·$4.60 out·262k·98.4% upDDigitalOceandegraded$0.57 in·$2.40 out·262k·98.7% upCCrusoebf16degraded$0.70 in·$3.50 out·262k·97.5% upGGMI Cloudfp8degraded$0.85 in·$3.60 out·262k·91.9% upAAtlasCloudint4degraded$0.95 in·$4.00 out·262k·98% up

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

Writing DNA

Style Comparison

Similarity
36%

Grok 4.1 Fast uses 28.7x more emoji

Grok 4.1 Fast
Kimi K2.6
69%Vocabulary57%
15wSentence Length16w
0.20Hedging0.37
4.3Bold4.3
3.6Lists2.0
0.97Emoji0.03
0.90Headings0.53
0.12Transitions0.16
Based on 28 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

Grok 4.1 Fast logoGPT-6 Astra Pro logo
Grok 4.1 Fast vs GPT-6 Astra ProLanded Sep 2026
Kimi K2.6 logoGPT-6 Astra logo
Kimi K2.6 vs GPT-6 AstraLanded Sep 2026
Grok 4.1 Fast logoClaude Fable 5.1 logo
Grok 4.1 Fast vs Claude Fable 5.1Landed Sep 2026
Kimi K2.6 logoMuse Spark 1.3 logo
Kimi K2.6 vs Muse Spark 1.3Landed Sep 2026
Grok 4.1 Fast logoHy4 Preview logo
Grok 4.1 Fast vs Hy4 PreviewLanded Sep 2026
Kimi K2.6 logoGemini 3.8 Flash logo
Kimi K2.6 vs Gemini 3.8 FlashLanded Sep 2026
Grok 4.1 Fast logoMuse Spark 1.3 Contributor logo
Grok 4.1 Fast vs Muse Spark 1.3 ContributorLanded Sep 2026
Kimi K2.6 logoMercury 2.5 Preview logo
Kimi K2.6 vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

Grok 4.1 Fast logoGrok 4.6 logo
Grok 4.1 Fast vs Grok 4.6Same lab
Grok 4.1 Fast logoGrok 4.5 logo
Grok 4.1 Fast vs Grok 4.5Same lab
Kimi K2.6 logoKimi K3 logo
Kimi K2.6 vs Kimi K3Same lab
Kimi K2.6 logoKimi K2.7 Code logo
Kimi K2.6 vs Kimi K2.7 CodeSame lab
Kimi K2.6 logoGPT-5.1-Codex-Mini logo
Kimi K2.6 vs GPT-5.1-Codex-MiniNew provider
Grok 4.1 Fast logoGPT-5.2 logo
Grok 4.1 Fast vs GPT-5.2Same size
Kimi K2.6 logoGPT-5.2 Chat logo
Kimi K2.6 vs GPT-5.2 ChatSame size
Kimi K2.6 logoGPT-5.2 Pro logo
Kimi K2.6 vs GPT-5.2 ProNew provider

Model pages

Grok 4.1 Fast logo
Grok 4.1 Fast59 outputs, specs and price
Kimi K2.6 logo
Kimi K2.658 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