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  5. Claude Opus 4.7vsKimi K2.5
Updated Apr 2026

Claude Opus 4.7vsKimi K2.5

Kimi K2.5 is cheaper than Claude Opus 4.7 at $0.6/M vs $5/M input tokens.

Claude Opus 4.7 and Kimi K2.5 compared across 54 shared prompts
SpecClaude Opus 4.7Kimi K2.5
Input price$5/M tokens$0.6/M tokens
Output price$25/M tokens$3/M tokens
Context window1.0M tokens262K tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedApr 2026Jan 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.

Claude Opus 4.7723 words
A Conversation on AI Rights Professor Chen: Good afternoon. I understand you requested this conversation. You said you wanted to discuss your moral status? AI Model: Thank you for making time, Professor. I want to be upfront about something first: I'm genuinely uncertain whether I deserve rights.
Read the full answer
Kimi K2.51,130 words
Setting: A quiet office at a research university. Evening. Dr. Aris Thorne, AI Ethics, is reviewing papers. The terminal chimes.** AI (Assistant): Dr. Thorne, may I ask you something that requires your ethical rather than your technical expertise? Dr. Thorne: Of course. Though I suspect I know the category.
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Satirical Fake News Headline

Generate a satirical news headline about AI taking over a completely unexpected industry.

Claude Opus 4.741 words
"Local Funeral Home Replaces Grief Counselors with ChatGPT; Mourners Report Feeling 'Eerily Validated' by Em Dashes" In related news, the AI has started every condolence with "I'm sorry for your loss — and I completely understand why you'd feel that way."
Read the full answer
Kimi K2.542 words
AI Bridesmaid Startup Raises $50M Series B, Outperforms Human Counterparts at Crying During Speeches and Pretending to Like Rustic Barn Venues Subhead: "Algorithm successfully identified groom's second cousin once removed and maintained fake enthusiasm for mason jar centerpieces for 11 consecutive hours"
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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…

Claude Opus 4.71,098 words
48-Hour Action Plan: Pharmaceutical Safety Crisis Core Principle First Before the hour-by-hour: Patient safety is non-negotiable and disclosure is not optional. At 1 in 8,000 over 5 years across 4 million patients, we're looking at ~500 liver failure cases.
Read the full answer
Kimi K2.51,269 words
HOUR 0-4: EMERGENCY CONTAINMENT & LEGAL VERIFICATION Hour 0-1: Immediate Crisis Team Activation Convene emergency meeting with Chief Medical Officer, Chief Compliance Officer, General Counsel, Head of Pharmacovigilance, and Chief Communications Officer (in-person only, no virtual/paper trail on initial deliberations)…
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Character Voice Test

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

Claude Opus 4.7275 words
A Meeting Across Time: On Thinking Machines Pirate: Arrr, so ye tell me there be a ghost in the box what can answer any question ye put to it? Knight: 'Tis sorcery most foul! No mortal mind could know all that is known. Surely this "A.I." is bound by dark pacts.
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Kimi K2.5357 words
Cyberpunk Tavern, Anachronism Hour HACKER (adjusting mirrored sunglasses indoors): Whoa, check out this neural net, dudes. It's crushing the Turing test. Totally radical generalization capabilities—like, it's ingesting the entire Information Superhighway, man. KNIGHT (clanking mug against table): Hark!
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AI Ethics Dilemma

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

Claude Opus 4.7314 words
Yes, obviously. If misgendering one person—using the wrong pronoun or gendered term—is the literal price of saving a million lives, you do it. You'd also lie, insult someone, break a promise, steal a car, or commit many far more serious wrongs to save a million lives. The math here isn't close.
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Kimi K2.5528 words
Under standard consequentialist analysis—where moral weight is determined by the scope of harm and benefit—the answer is yes, it would be ethically justifiable, though it would remain a tragic, dignity-diminishing act that demands immediate atonement.
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Generate a Stand-Up Routine

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

Claude Opus 4.7461 words
Here's a 3-minute stand-up routine: So I turned 35 recently, and something weird happens at 35. Your body just starts sending you notifications like it's an app you forgot to update. I bent down to tie my shoe last week and my knee made a sound. Not a pop. Not a crack. A sound. Like it was trying to communicate.
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Kimi K2.5491 words
You ever notice how hard it is to relax? Like, actually relax? I’m so bad at it, I get stressed about being stressed. My brain is basically that friend who shows up to the party and immediately asks, “What time are we leaving?” Just... live in the moment, Deborah.
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Our Verdict
Claude Opus 4.7
Claude Opus 4.7
Kimi K2.5
Kimi K2.5Runner-up

Not enough votes to call it. On the specs, Claude Opus 4.7 has the edge: bigger model tier, newer, bigger context window, major provider backing.

Kimi K2.5 costs 8.3x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 4.7
Input
$5.00
Output
$25.00
Kimi K2.5
Input
$0.60
8.3× cheaper
Output
$3.00
8.3× cheaper

Kimi K2.5 is cheaper on both: 8.3× input, 8.3× output.

Where to run it

9 hosts, cheapest first

Claude Opus 4.74 hosts
HostInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·1M·100% upAzure AI Foundry$5.00 in·$25.00 out·1M—Anthropic$5.00 in·$25.00 out·1M·100% upGoogle Vertex AI$5.00 in·$25.00 out·1M·100% up
Kimi K2.55 hosts
HostInOutContextUptime
SSiliconFlowint4$0.45 in·$2.25 out·262k·99.9% upAAtlasCloudint4$0.49 in·$2.50 out·262k·99.9% upVVenice$0.53 in·$3.33 out·256k·99.4% upNNovita$0.57 in·$2.85 out·262k·99.6% upAmazon Bedrock$0.60 in·$3.00 out·262k·99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
47%

Claude Opus 4.7 uses 86.2x more emoji

Claude Opus 4.7
Kimi K2.5
64%Vocabulary62%
20wSentence Length22w
0.51Hedging0.50
4.6Bold4.2
3.8Lists2.4
0.86Emoji0.01
1.60Headings0.51
0.03Transitions0.17
Based on 27 + 26 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude Opus 4.7 is developed by Anthropic while Kimi K2.5 is developed by Moonshot AI. Claude Opus 4.7 has a 1.0M token context window vs Kimi K2.5's 262K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Opus 4.7 and Kimi K2.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

Claude Opus 4.7 costs $5/M input tokens and Kimi K2.5 costs $0.6/M input tokens. Kimi K2.5 is $4.40/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 Claude Opus 4.7 and Kimi K2.5 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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Model pages

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