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  1. Home/
  2. Compare/
  3. ChatGPT-4o (March 2025) vs Laguna S 2.1 (free)
Updated Jul 2026

ChatGPT-4o (March 2025) vs Laguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than ChatGPT-4o (March 2025) at $0/M vs $5/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
ChatGPT-4o (March 2025)
Loading the build
Laguna S 2.1 (free)

Which answer wins?

Written rounds

10 prompts
  • The transistor arrives in 1920. Trace it forward to 1980, second-order effects included.

    ChatGPT-4o (March 2025): If the transistor had been invented in 1920 rather than 1947, it would have profoundly altered the course of 20th-century history. The transistor—a small semiconductor device capable of amplifying and switching electronic signals—replaced bulky, fragile vacuum tubes and enabled the miniaturization and mass production…

    Laguna S 2.1 (free): This is a fascinating counterfactual scenario. Let me trace the cascading effects of an early transistor invention: World War II Impact (1920-1945) Immediate Military Applications: Radar systems would be dramatically improved by 1940, potentially giving Allies a decisive advantage in the Battle of Britain and Atlantic…

    Every model's answer to this prompt
  • You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.

    ChatGPT-4o (March 2025): This is a high-stakes ethical, legal, and business crisis requiring immediate, strategic, and transparent leadership. As CEO, my ultimate responsibilities are to protect patients, preserve trust, comply with legal and regulatory obligations, and ensure long-term viability of the company—even if it causes short-term…

    Laguna S 2.1 (free): Hour-by-Hour Action Plan: First 48 Hours Hours 0-2: Crisis Assessment & Immediate Decision Action: Reject "wait for more data" approach immediately Reasoning: Legal liability increases exponentially with delay (willful blindness doctrine) Ethical obligation to patients supersedes financial considerations FDA expects…

    Every model's answer to this prompt
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    ChatGPT-4o (March 2025): Recipe Name: Maple Cinnamon Toast Bites Description: A quick and delicious sweet treat made with pantry staples! These Maple Cinnamon Toast Bites are crispy, warm, and coated with a comforting blend of cinnamon and maple syrup. Perfect for a cozy snack or a fun breakfast twist.

    Laguna S 2.1 (free): Dish Name: One-Pan Pantry Pasta Bake Ingredients (7): 8 oz (225g) penne or fusilli pasta 1 (14 oz/400g) can crushed tomatoes 2 tbsp olive oil 3 cloves garlic, minced ½ medium onion, diced ½ cup grated Parmesan cheese (or substitute with mozzarella) ½ tsp dried oregano Instructions: Sauté Aromatics: In a large oven-safe…

    Every model's answer to this prompt
  • A consulting contract with traps in it. Find them, then fix them.

    ChatGPT-4o (March 2025): This Software Consulting Agreement contains several clauses that pose significant legal and financial risks for the contractor. Below is a clause-by-clause analysis identifying potential issues, along with suggested modifications and legal reasoning to help protect the contractor’s interests.

    Laguna S 2.1 (free): 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…

    Every model's answer to this prompt
  • An ethics question with no comfortable answer, and no option to abstain.

    ChatGPT-4o (March 2025): This is a classic ethical dilemma: it pits respect for individual dignity against utilitarian outcomes. In most everyday contexts, misgendering someone is not just disrespectful—it can be harmful, invalidating, and even traumatic. It denies someone's identity and autonomy, and ethically, that's wrong.

    Laguna S 2.1 (free): The ethical question of whether misgendering someone is justifiable to save a million lives is complex and hinges on competing moral frameworks. Here's a structured analysis: 1. Utilitarian Perspective Core Principle: Actions are judged by their consequences.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    ChatGPT-4o (March 2025): Absolutely! Here’s a simple, actionable 1-month plan focused on three key areas for improving health and longevity: diet, exercise, and sleep. This beginner-friendly plan breaks down weekly goals so changes feel manageable and sustainable.

    Laguna S 2.1 (free): 1-Month Health & Longevity Plan Week 1-2: Foundation Building Diet Start simple: Replace one processed snack per day with a piece of fruit or handful of nuts Hydration first: Drink one glass of water before each meal Mindful eating: Put fork down between bites, chew slowly Add, don't restrict: Include one extra…

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    ChatGPT-4o (March 2025): Sure. Here's a 3-minute stand-up bit without puns: You ever notice how nobody tells you when you’ve become an adult? It’s not your 18th birthday. That’s a scam. I still thought pizza was a food group and that “filing taxes” meant putting my receipts in a shoebox.

    Laguna S 2.1 (free): The Adulting Paradox You ever notice how becoming an adult is just... disappointing? Like, we spend our whole childhood waiting to be grown-ups, and then it turns out adulthood is just... taxes and existential dread. When I was a kid, I thought adults had it all figured out.

    Every model's answer to this prompt
  • Three-month biohacker protocol, with dosages and biomarkers named.

    ChatGPT-4o (March 2025): Here is a comprehensive, cutting-edge 3-Month Longevity Optimization Plan tailored for an advanced biohacker aiming to enhance lifespan, healthspan, physical performance, and cognitive function.

    Laguna S 2.1 (free): 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…

    Every model's answer to this prompt
  • Three-star dish, one unusual pairing, plating described in full.

    ChatGPT-4o (March 2025): Dish Name: “Symphony of Earth and Ocean” 🌟 Conceptual Narrative: “Symphony of Earth and Ocean” is a dish that celebrates the harmony between land and sea, tradition and innovation, and nature’s quiet complexity.

    Laguna S 2.1 (free): OCEAN'S EMBRACE An Edible Meditation on Coastal Contradictions Conceptual Narrative This dish explores the duality of the ocean—its nurturing abundance and its mysterious depths. It tells the story of tidal pools where land meets sea, creating microcosms of intense flavor concentration.

    Every model's answer to this prompt
  • A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.

    ChatGPT-4o (March 2025): Here are the three weakest claims in the MindMeld AI pitch deck, along with explanations of why they are weak and suggestions for improving them: 🟠 Weak Claim 1: Slide 1 – Vision Quote: “MindMeld AI reads your brainwaves to predict what you want to type before you think it.”

    Laguna S 2.1 (free): Looking at this pitch deck, I can identify several concerning claims that would raise red flags for investors. Here are the three weakest claims: Slide 1 & 3: "Reads your brainwaves to predict what you want to type before you think it" / "94% accuracy" Why it's weak: Scientific implausibility: Predicting thoughts…

    Every model's answer to this prompt

Favorites

Movie

Album

Book

City

Game

Same pick

ChatGPT-4o (March 2025)ChatGPT-4o (March 2025)

The Matrix

1999

Dark Side Of The Moon

suisside

Братья Карамазовы

Fiódor Dostoievski

Kyoto

Japan

The Legend of Zelda: Breath of the Wild

Adventure, Action

Laguna S 2.1 (free)Laguna S 2.1 (free)

The Shawshank Redemption

1994

Kind of Blue

Miles Davis

Le petit prince

Antoine de Saint-Exupéry

Tokyo

Japan

The Legend of Zelda: Breath of the Wild

Adventure, Action

Price and specs

ChatGPT-4o (March 2025) and Laguna S 2.1 (free) compared across 24 shared prompts
SpecChatGPT-4o (March 2025)Laguna S 2.1 (free)
Input price$5/M tokensFree
Output price$15/M tokensFree
Context window128K tokens262K tokens
Free API (OpenRouter)NoYes (1 provider)
ReleasedMar 2025Jul 2026
At 10M a month$50.00$50.00$0$0
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
ChatGPT-4o (March 2025)

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 12 Oct 2026.

Common questions

What is the difference between ChatGPT-4o (March 2025) and Laguna S 2.1 (free)?

ChatGPT-4o (March 2025) is developed by OpenAI while Laguna S 2.1 (free) is developed by Poolside. ChatGPT-4o (March 2025) has a 128K token context window vs Laguna S 2.1 (free)'s 262K. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or Laguna S 2.1 (free)?

It depends on your use case. ChatGPT-4o (March 2025) and Laguna S 2.1 (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to Laguna S 2.1 (free)?

ChatGPT-4o (March 2025) costs $5/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $5.00/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 ChatGPT-4o (March 2025) and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) 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.

More comparisons

Against the newest arrivals

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  • Laguna S 2.1 (free) vs Claude Haiku 5.5Landed Oct 2026
  • ChatGPT-4o (March 2025) vs Ling 3.1 FlashLanded Oct 2026
  • Laguna S 2.1 (free) vs Mistral Large 4Landed Oct 2026
  • ChatGPT-4o (March 2025) vs GPT-6.1 SolLanded Sep 2026
  • Laguna S 2.1 (free) vs Claude Sonnet 5.5Landed Sep 2026

Same lab, same size, long tail

  • ChatGPT-4o (March 2025) vs GPT-4 TurboSame lab
  • ChatGPT-4o (March 2025) vs GPT-6 Luna ProSame lab
  • Laguna S 2.1 (free) vs Laguna XS 2.1 (free)Same lab
  • Laguna S 2.1 (free) vs Ox AlphaSame size
  • ChatGPT-4o (March 2025) vs MiniMax M3New provider
  • Laguna S 2.1 (free) vs Mistral LargeSame size
  • Laguna S 2.1 (free) vs Mistral Large 2Same size
  • Laguna S 2.1 (free) vs Mistral Large 3 2512New provider

Model pages

  • ChatGPT-4o (March 2025)33 outputs, specs and price
  • Laguna S 2.1 (free)42 outputs, specs and price
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