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
  • Default Index
  • 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. Claude Opus 4vsLaguna S 2.1 (free)
Updated Jul 2026

Claude Opus 4vsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than Claude Opus 4 at $0/M vs $15/M input tokens.

Claude Opus 4 and Laguna S 2.1 (free) compared across 10 shared prompts
SpecClaude Opus 4Laguna S 2.1 (free)
Input price$15/M tokensFree
Output price$75/M tokensFree
Context window200K tokens262K tokens
Free API (OpenRouter)NoYes (1 provider)
ReleasedMay 2025Jul 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…

Claude Opus 465 words
15%) 20-30% improvement in cognitive test scores Significant improvements in energy and recovery Optimized bloodwork markers Monthly Investment Estimate Supplements: $400-600 Testing: $500-1000 (Month 1 & 3) Devices/Wearables: $500-1500 (one-time) Food: $600-800 (quality sources) Professional services: $200-500…
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…
Read the full answer

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…

Claude Opus 4713 words
INVESTMENT COMMITTEE MEMO Company: LedgerLift (LLLT) Date: December 2024 Analyst: [Name] RECOMMENDATION: LONG PT: $58-65 Position Size: 3.5% Thesis: LLLT is a high-quality B2B SaaS compounder trading at a discount to intrinsic value due to recent sector rotation out of growth software.
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.
Read the full answer

Adversarial Contract Review

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

Claude Opus 4544 words
This contract is heavily biased against the Contractor. Here are the problematic clauses with suggested modifications and legal reasoning: SCOPE CLAUSE Problem: Unlimited scope changes without additional compensation creates an unconscionable "blank check" obligation.
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
Our Verdict
Claude Opus 4
Claude Opus 4
Laguna S 2.1 (free)
Laguna S 2.1 (free)Runner-up

Not enough votes to call it. On the specs, Claude Opus 4 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

Claude Opus 4
Input
$15.00
Output
$75.00
Laguna S 2.1 (free)
Input
$0.000
Output
$0.000
Where to run it

1 host

Claude Opus 4

No hosts listed on OpenRouter.

Laguna S 2.1 (free)1 host
HostInOutContextUptime
PPoolsidefp4$0 in·$0 out·262k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Claude Opus 4 is developed by Anthropic while Laguna S 2.1 (free) is developed by Poolside. Claude Opus 4 has a 200K 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.

It depends on your use case. Claude Opus 4 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.

Claude Opus 4 costs $15/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $15.00/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 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.

Keep exploring

More comparisons

Against the newest arrivals

Claude Opus 4 logoDeepSeek V4 Flash Vision Exp logo
Claude Opus 4 vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Laguna S 2.1 (free) logoSolar Pro 4 logo
Laguna S 2.1 (free) vs Solar Pro 4Landed Sep 2026
Claude Opus 4 logoHy3 logo
Claude Opus 4 vs Hy3Landed Sep 2026
Laguna S 2.1 (free) logoQwen3.7 Flash logo
Laguna S 2.1 (free) vs Qwen3.7 FlashLanded Sep 2026
Claude Opus 4 logoLing 3.0 Flash logo
Claude Opus 4 vs Ling 3.0 FlashLanded Sep 2026
Laguna S 2.1 (free) logoMuse Glimmer 30B logo
Laguna S 2.1 (free) vs Muse Glimmer 30BLanded Sep 2026
Claude Opus 4 logoGLM 5.3 logo
Claude Opus 4 vs GLM 5.3Landed Sep 2026
Laguna S 2.1 (free) logoTernary Bonsai 2 27B logo
Laguna S 2.1 (free) vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

Claude Opus 4 logoClaude Sonnet 4 logo
Claude Opus 4 vs Claude Sonnet 4Version compare
Claude Opus 4 logoClaude Opus 4.6 logo
Claude Opus 4 vs Claude Opus 4.6Version compare
Laguna S 2.1 (free) logoLaguna XS 2.1 (free) logo
Laguna S 2.1 (free) vs Laguna XS 2.1 (free)Same lab
Laguna S 2.1 (free) logoOx Alpha logo
Laguna S 2.1 (free) vs Ox AlphaSame size
Laguna S 2.1 (free) logoMuse Spark 1.1 logo
Laguna S 2.1 (free) vs Muse Spark 1.1Same size
Laguna S 2.1 (free) logoMuse Spark 1.3 logo
Laguna S 2.1 (free) vs Muse Spark 1.3Same size
Laguna S 2.1 (free) logoMuse Spark 1.3 Contributor logo
Laguna S 2.1 (free) vs Muse Spark 1.3 ContributorSame size
Laguna S 2.1 (free) logoNemotron 3 Nano Omni (free) logo
Laguna S 2.1 (free) vs Nemotron 3 Nano Omni (free)Same size

Model pages

Claude Opus 4 logo
Claude Opus 458 outputs, specs and price
Laguna S 2.1 (free) logo
Laguna S 2.1 (free)10 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
  • Default Index
  • 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