What is the difference between GPT-5 Mini and Laguna S 2.1 (free)?

GPT-5 Mini is developed by OpenAI while Laguna S 2.1 (free) is developed by Poolside. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Mini or Laguna S 2.1 (free)?

It depends on your use case. GPT-5 Mini 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 GPT-5 Mini cost compared to Laguna S 2.1 (free)?

GPT-5 Mini costs $0.25/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $0.25/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 GPT-5 Mini and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of GPT-5 Mini 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

GPT-5 MinivsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than GPT-5 Mini at $0/M vs $0.25/M input tokens.

GPT-5 Mini and Laguna S 2.1 (free) compared across 10 shared prompts
Spec	GPT-5 Mini	Laguna S 2.1 (free)
Input price	$0.25/M tokens	Free
Output price	$2/M tokens	Free
Context window	—	262K tokens
Weights	Closed	—
Free API (OpenRouter)	No	Yes (1 provider)
Released	Aug 2025	Jul 2026

Side by side

Same prompt, both answers

Opening lines from 2 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…

GPT-5 Mini626 words

Important safety first: this plan is informational and ambitious. Before starting, get medical clearance (especially if you have chronic illness, take medications, are pregnant/breastfeeding, or are >65).

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…

GPT-5 Mini931 words

Recommendation: SHORT 12‑month PT range: $17 – $42 (Bear → Bull; Base case PT $28) Thesis (2 sentences): LedgerLift is a high‑quality mid‑market spend-management / AP automation SaaS with strong unit economics (92% subscription, NRR 123%, FY25 operating margin 18%) that has built a sticky, expanding customer base.

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

Our Verdict

Laguna S 2.1 (free)

GPT-5 MiniRunner-up

Not enough votes to call it. On the specs, Laguna S 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 Mini

Input

$0.25

Output

$2.00

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Where to run it

3 hosts

GPT-5 Mini2 hosts

HostInOutContextUptime

Azure AI Foundry$0.25 in$2.00 out400k100% up OpenAI$0.25 in$2.00 out400k100% 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

Advanced Longevity Plan (Biohacker)

Advanced Investment Memo (IC Memo)

Cost per 1M tokens

3 hosts

What we learned reading every model

Common questions

What is the difference between GPT-5 Mini and Laguna S 2.1 (free)?

Which is better, GPT-5 Mini or Laguna S 2.1 (free)?

How much does GPT-5 Mini cost compared to Laguna S 2.1 (free)?

How can I compare GPT-5 Mini 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

Advanced Longevity Plan (Biohacker)

Advanced Investment Memo (IC Memo)

Cost per 1M tokens

3 hosts

What we learned reading every model

Common questions

What is the difference between GPT-5 Mini and Laguna S 2.1 (free)?

Which is better, GPT-5 Mini or Laguna S 2.1 (free)?

How much does GPT-5 Mini cost compared to Laguna S 2.1 (free)?

How can I compare GPT-5 Mini and Laguna S 2.1 (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages