What is the difference between Kimi K3 and Laguna S 2.1 (free)?

Kimi K3 is developed by Moonshot AI while Laguna S 2.1 (free) is developed by Poolside. Kimi K3 has a 1.0M token context window vs Laguna S 2.1 (free)'s 262K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Kimi K3 or Laguna S 2.1 (free)?

It depends on your use case. Kimi K3 and Laguna S 2.1 (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Kimi K3 cost compared to Laguna S 2.1 (free)?

Kimi K3 costs $3/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $3.00/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 Kimi K3 and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of Kimi K3 and Laguna S 2.1 (free) 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.

Updated Jul 2026

Kimi K3vsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than Kimi K3 at $0/M vs $3/M input tokens.

Kimi K3 and Laguna S 2.1 (free) compared across 10 shared prompts
Spec	Kimi K3	Laguna S 2.1 (free)
Input price	$3/M tokens	Free
Output price	$15/M tokens	Free
Context window	1.0M tokens	262K tokens
Weights	Open	—
Free API (OpenRouter)	No	Yes (1 provider)
Released	Jul 2026	Jul 2026

Side by side

Same prompt, both answers

Opening lines from 3 of the 10 prompts both answered. Formatting stripped, words untouched.

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Kimi K31,167 words

The 3-Month Longevity Optimization Protocol Important caveat before we begin: This plan is designed for a healthy adult. Get physician clearance before starting—especially for prolonged fasting, high-dose supplements, and anything prescription-grade. Several items below interact with medications (notably berberine).

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Laguna S 2.1 (free)1,140 words

Comprehensive 3-Month Longevity Optimization Plan Phase 1: Foundation & Assessment (Month 1) Week 1-2: Baseline Establishment Comprehensive Health Testing Complete blood panel (CBC, CMP, lipid panel, inflammatory markers: hs-CRP, IL-6) Hormone panel (testosterone, estrogen, DHEA, cortisol, thyroid panel) Genetic…

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Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Kimi K31,904 words

Contract Risk Analysis: Contractor Perspective Overall assessment: Every substantive clause in this agreement is one-sided in the Client's favor. Several are likely unenforceable as written, but enforceability only matters after expensive litigation — the practical risk is that these clauses give the Client leverage to…

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Laguna S 2.1 (free)275 words

I'll analyze each clause for potential exploitation against the contractor and suggest improvements. Exploitable Clauses & Recommended Modifications SCOPE CLAUSE Problem: "Client reserves the right to modify the scope at any time without additional compensation" Allows unlimited scope creep without extra pay No…

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Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

Kimi K31,055 words

IC MEMO — LedgerLift (LLLT) Price $46 Mkt cap $8.74B Net cash $1.4B EV $7.34B EV/FY25 Rev 9.0x EV/FY26E Rev 7.4x EV/FY26E EBIT 37x Recommendation: SHORT (moderate conviction; 1.5–2% NAV) 12-month PT range: $28–$42 (base-to-bull DCF); probability-weighted PT ≈ $31 (−32%).

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Laguna S 2.1 (free)910 words

INTERNAL INVESTMENT COMMITTEE MEMO 1. Recommendation & Thesis Recommendation: LONG 12-Month Price Target Range: $62 – $75/share Thesis: LedgerLift is a high-quality B2B SaaS platform with strong recurring revenue, exceptional unit economics, and durable customer retention.

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Our Verdict

Kimi K3

Laguna S 2.1 (free)Runner-up

Not enough votes to call it. On the specs, Kimi K3 has the edge: bigger model tier, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Kimi K3

Input

$3.00

Output

$15.00

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Where to run it

18 hosts, cheapest first

Kimi K317 hosts

HostInOutContextUptime

Sail Researchfp4$1.05 in$13.00 out1M99.9% up InferenceNetfp4$1.95 in$9.75 out1M98.4% up Phala$1.95 in$9.75 out1M98.5% up Relacefp4$1.95 in$9.75 out1M99.3% up Wafer$2.49 in$10.95 out1M99.9% up Morph$2.50 in$14.00 out1M98.8% up

11 more hosts

Makora$2.55 in$12.75 out1M97.2% up DigitalOcean$2.55 in$12.95 out1M99.5% up DeepInfrabf16$2.85 in$14.25 out1M92.1% up Basetenfp8$3.00 in$15.00 out1M98.7% up Chutesmxfp4$3.00 in$15.00 out1M98.1% up Fireworks$3.00 in$15.00 out1M100% up Modalmxfp4$3.00 in$15.00 out1M99.5% up Moonshot AImxfp4$3.00 in$15.00 out1M99.9% up Parasailfp4$3.00 in$15.00 out1M98.5% up Together$3.00 in$15.00 out1M99.5% up Alibaba Cloud$3.45 in$17.25 out1M97.5% up

Laguna S 2.1 (free)1 host

HostInOutContextUptime

Poolsidefp4$0 in$0 out262k100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

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