What is the difference between Laguna S 2.1 (free) and Muse Spark 1.3?

Laguna S 2.1 (free) is developed by Poolside while Muse Spark 1.3 is developed by Meta AI. Laguna S 2.1 (free) has a 262K token context window vs Muse Spark 1.3's 1.0M. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Laguna S 2.1 (free) or Muse Spark 1.3?

It depends on your use case. Laguna S 2.1 (free) and Muse Spark 1.3 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 Laguna S 2.1 (free) cost compared to Muse Spark 1.3?

Laguna S 2.1 (free) costs $0/M input tokens and Muse Spark 1.3 costs $1.25/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 Laguna S 2.1 (free) and Muse Spark 1.3 on Rival?

This page shows a side-by-side comparison of Laguna S 2.1 (free) and Muse Spark 1.3 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 Sep 2026

Laguna S 2.1 (free)vsMuse Spark 1.3

Laguna S 2.1 (free) is cheaper than Muse Spark 1.3 at $0/M vs $1.25/M input tokens.

Laguna S 2.1 (free) and Muse Spark 1.3 compared across 10 shared prompts
Spec	Laguna S 2.1 (free)	Muse Spark 1.3
Input price	Free	$1.25/M tokens
Output price	Free	$4.25/M tokens
Context window	262K tokens	1.0M tokens
Weights	—	Closed
Free API (OpenRouter)	Yes (1 provider)	No
Released	Jul 2026	Sep 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…

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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Muse Spark 1.31,591 words

This is general information about contracting risks, not legal advice and not an attorney-client relationship. Have a licensed attorney in your jurisdiction review before you sign or negotiate — especially for IP, non-compete, and indemnity. This agreement as drafted is heavily one-sided.

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Advanced Longevity Plan (Biohacker)

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

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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Muse Spark 1.31,588 words

Disclaimer: For informational and educational purposes only. This is not medical advice. Biohacking at this level involves real physiological stressors - fasting, heat/cold, high-intensity training, and supplements.

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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…

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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Muse Spark 1.31,001 words

To: Investment Committee From: Long/Short Equity Re: LedgerLift (LLLT) – SHORT Price $46 Recommendation: SHORT – 12-month PT $30, range $26-$42 (Bear $17 / Base $28 / Bull $42 DCF).

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Our Verdict

Muse Spark 1.3

Laguna S 2.1 (free)Runner-up

Not enough votes to call it. On the specs, Muse Spark 1.3 has the edge: newer, bigger context window, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Muse Spark 1.3

Input

$1.25

Output

$4.25

Where to run it

2 hosts

Laguna S 2.1 (free)1 host

HostInOutContextUptime

Poolsidefp4$0 in$0 out262k100% up

Muse Spark 1.31 host

HostInOutContextUptime

Meta$1.25 in$4.25 out1M100% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 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 Laguna S 2.1 (free) and Muse Spark 1.3?

Which is better, Laguna S 2.1 (free) or Muse Spark 1.3?

How much does Laguna S 2.1 (free) cost compared to Muse Spark 1.3?

How can I compare Laguna S 2.1 (free) and Muse Spark 1.3 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 Laguna S 2.1 (free) and Muse Spark 1.3?

Which is better, Laguna S 2.1 (free) or Muse Spark 1.3?

How much does Laguna S 2.1 (free) cost compared to Muse Spark 1.3?

How can I compare Laguna S 2.1 (free) and Muse Spark 1.3 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages