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  5. GPT-5 NanovsLaguna XS 2.1 (free)
Updated Jul 2026

GPT-5 NanovsLaguna XS 2.1 (free)

Laguna XS 2.1 (free) is the newer model, released after GPT-5 Nano.

GPT-5 Nano and Laguna XS 2.1 (free) compared across 11 shared prompts
SpecGPT-5 NanoLaguna XS 2.1 (free)
Input price—Free
Output price—Free
Context window—262K tokens
WeightsClosed—
Free API (OpenRouter)NoYes (1 provider)
ReleasedAug 2025Jul 2026
Side by side

Same prompt, both answers

Opening lines from 3 of the 11 prompts both answered. Formatting stripped, words untouched.

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…

GPT-5 Nano1,294 words
Internal IC Memo – LedgerLift (LLLT) Recommendation, 12-month PT, thesis Recommendation: Short 12-month target range: $17 to $42; base-case fair value ~ $28; bull-case ~ $42; bear-case ~ $17 2-sentence thesis: LedgerLift trades near peers’ revenue/EBIT multiples but our DCF framework yields a base-case fair value well…
Read the full answer
Laguna XS 2.1 (free)877 words
INVESTMENT COMMITTEE MEMO Subject: LedgerLift (LLLT) – Long/Short/Comps Analysis Date: [Insert Date] Recommendation: LONG 12-Month Price Target Range: $85–$105 Thesis: LedgerLift is executing on a best-in-class B2B SaaS spend management platform with high net revenue retention (NRR), strong gross margins, and a rapidly…
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…

GPT-5 Nano455 words
Below is a dense, action-ready 12-week plan designed for a biohacker aiming to optimize longevity, physical and cognitive performance. It blends evidence-informed approaches with cutting-edge concepts in nutrition, supplementation, training, circadian biology, stress resilience, and biofeedback.
Read the full answer
Laguna XS 2.1 (free)828 words
3-Month Longevity & Performance Optimization Plan for a Biohacker Designed for advanced biohackers with a focus on longevity, cognitive sharpness, and peak physical performance. Assumes access to basic medical testing, wearables, and some advanced tools (e.g., neurofeedback apps).
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

GPT-5 Nano1,089 words
Here’s a simple, actionable 1-month plan focused on three beginner-friendly pillars: Diet, Movement (exercise), and Sleep. It’s designed to be easy to start, with small weekly progressions you can actually stick to.
Read the full answer
Laguna XS 2.1 (free)409 words
1-Month Health & Longevity Plan Focus Areas: Diet, Exercise, Sleep Week 1: Start with Foundational Habits Diet: Action: Add 1 serving of fruit or vegetables daily (e.g., a banana with breakfast, a side salad with lunch). Why: Boosts nutrient intake and fiber.
Read the full answer
Our Verdict
Laguna XS 2.1 (free)
Laguna XS 2.1 (free)
GPT-5 Nano
GPT-5 NanoRunner-up

Not enough votes to call it. On the specs, Laguna XS 2.1 (free) has the edge: bigger model tier, newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5 Nano
Input
—
Output
—
Laguna XS 2.1 (free)
Input
$0.000
Output
$0.000
Where to run it

3 hosts

GPT-5 Nano2 hosts
HostInOutContextUptime
Azure AI Foundry$0.05 in·$0.40 out·400k·99.9% upOpenAI$0.05 in·$0.40 out·400k·100% up
Laguna XS 2.1 (free)1 host
HostInOutContextUptime
PPoolsidefp8$0 in·$0 out·262k·99.8% up

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

Research

What we learned reading every model

FAQ

Common questions

GPT-5 Nano is developed by OpenAI while Laguna XS 2.1 (free) is developed by Poolside. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Nano and Laguna XS 2.1 (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of GPT-5 Nano and Laguna XS 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.

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GPT-5 Nano logoQwen3.7 Max logo
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Model pages

GPT-5 Nano logo
GPT-5 Nano59 outputs, specs and price
Laguna XS 2.1 (free) logo
Laguna XS 2.1 (free)11 outputs, specs and price
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