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  5. GPT-4.1 NanovsLaguna S 2.1 (free)
Updated Jul 2026

GPT-4.1 NanovsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than GPT-4.1 Nano at $0/M vs $0.1/M input tokens.

GPT-4.1 Nano and Laguna S 2.1 (free) compared across 2 shared prompts
SpecGPT-4.1 NanoLaguna S 2.1 (free)
Input price$0.1/M tokensFree
Output price$0.4/M tokensFree
Context window1.0M tokens262K tokens
WeightsClosed—
Free API (OpenRouter)NoYes (1 provider)
ReleasedApr 2025Jul 2026
Our Verdict
GPT-4.1 Nano
GPT-4.1 Nano
Laguna S 2.1 (free)
Laguna S 2.1 (free)

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-4.1 Nano
Input
$0.10
Output
$0.40
Laguna S 2.1 (free)
Input
$0.000
Output
$0.000
Where to run it

3 hosts

GPT-4.1 Nano2 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.40 out·1M·99.7% upOpenAI$0.10 in·$0.40 out·1M·99.8% up
Laguna S 2.1 (free)1 host
HostInOutContextUptime
PPoolsidefp4$0 in·$0 out·262k·99.9% up

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

Research

What we learned reading every model

FAQ

Common questions

GPT-4.1 Nano is developed by OpenAI while Laguna S 2.1 (free) is developed by Poolside. GPT-4.1 Nano has a 1.0M token context window vs Laguna S 2.1 (free)'s 262K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-4.1 Nano and Laguna S 2.1 (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

GPT-4.1 Nano costs $0.1/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $0.10/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 GPT-4.1 Nano 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.

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Model pages

GPT-4.1 Nano logo
GPT-4.1 Nano55 outputs, specs and price
Laguna S 2.1 (free) logo
Laguna S 2.1 (free)2 outputs, specs and price
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