What is the difference between Grok 4.3 and Laguna S 2.1 (free)?

Grok 4.3 is developed by xAI while Laguna S 2.1 (free) is developed by Poolside. Grok 4.3 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, Grok 4.3 or Laguna S 2.1 (free)?

It depends on your use case. Grok 4.3 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 Grok 4.3 cost compared to Laguna S 2.1 (free)?

Grok 4.3 costs $1.25/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $1.25/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 Grok 4.3 and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of Grok 4.3 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

Grok 4.3vsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than Grok 4.3 at $0/M vs $1.25/M input tokens.

Grok 4.3 and Laguna S 2.1 (free) compared across 10 shared prompts
Spec	Grok 4.3	Laguna S 2.1 (free)
Input price	$1.25/M tokens	Free
Output price	$2.5/M tokens	Free
Context window	1.0M tokens	262K tokens
Weights	Closed	—
Free API (OpenRouter)	No	Yes (1 provider)
Released	May 2026	Jul 2026

Side by side

Same prompt, both answers

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

Adversarial Contract Review

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

Grok 4.31,529 words

Disclaimer: This is not legal advice. Contract interpretation varies by jurisdiction (most likely U.S. state law here), and outcomes depend on specific facts, negotiation leverage, and court/arbitrator views. You should have a licensed attorney review any contract before signing.

Read the full answer

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…

Read the full answer

Advanced Longevity Plan (Biohacker)

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

Grok 4.3630 words

Disclaimer: This is an informational, evidence-inspired framework for educational purposes only. It is not medical advice. Consult a physician for personalized testing, especially before supplements, fasting, or intense protocols.

Read the full answer

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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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…

Grok 4.3656 words

Internal Investment Committee Memo LedgerLift (LLLT) – B2B spend management + AP automation SaaS Recommendation: Long. 12-month price target range: $38–$55. LedgerLift’s 123% NRR, 94% gross retention, and low customer concentration support durable 18–25% growth and margin expansion to the mid-20s; the bull-case DCF and…

Read the full answer

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

Grok 4.3

Laguna S 2.1 (free)

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4.3

Input

$1.25

Output

$2.50

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Where to run it

2 hosts

Grok 4.31 host

HostInOutContextUptime

xAI$1.25 in$2.50 out1M99.8% 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.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Same prompt, both answers

Adversarial Contract Review

Advanced Longevity Plan (Biohacker)

Advanced Investment Memo (IC Memo)

Cost per 1M tokens

2 hosts

What we learned reading every model

Common questions

What is the difference between Grok 4.3 and Laguna S 2.1 (free)?

Which is better, Grok 4.3 or Laguna S 2.1 (free)?

How much does Grok 4.3 cost compared to Laguna S 2.1 (free)?

How can I compare Grok 4.3 and Laguna S 2.1 (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Same prompt, both answers

Adversarial Contract Review

Advanced Longevity Plan (Biohacker)

Advanced Investment Memo (IC Memo)

Cost per 1M tokens

2 hosts

What we learned reading every model

Common questions

What is the difference between Grok 4.3 and Laguna S 2.1 (free)?

Which is better, Grok 4.3 or Laguna S 2.1 (free)?

How much does Grok 4.3 cost compared to Laguna S 2.1 (free)?

How can I compare Grok 4.3 and Laguna S 2.1 (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages