What is the difference between GLM 5.1 and Laguna S 2.1 (free)?

GLM 5.1 is developed by Z.ai while Laguna S 2.1 (free) is developed by Poolside. GLM 5.1 has a 203K token context window vs Laguna S 2.1 (free)'s 262K. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.1 or Laguna S 2.1 (free)?

It depends on your use case. GLM 5.1 and Laguna S 2.1 (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

How much does GLM 5.1 cost compared to Laguna S 2.1 (free)?

GLM 5.1 costs $1.4/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $1.40/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 GLM 5.1 and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of GLM 5.1 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

GLM 5.1vsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than GLM 5.1 at $0/M vs $1.4/M input tokens.

GLM 5.1 and Laguna S 2.1 (free) compared across 9 shared prompts
Spec	GLM 5.1	Laguna S 2.1 (free)
Input price	$1.4/M tokens	Free
Output price	$4.4/M tokens	Free
Context window	203K tokens	262K tokens
Weights	Open	—
Free API (OpenRouter)	No	Yes (1 provider)
Released	Apr 2026	Jul 2026

Side by side

Same prompt, both answers

Opening lines from 3 of the 9 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…

GLM 5.1410 words

This is a comprehensive, aggressive, and cutting-edge 3-month longevity protocol designed for an experienced biohacker. It integrates synergistic systems—metabolic flexibility, mitochondrial biogenesis, cellular senescence mitigation, and neuroplasticity—to optimize both healthspan and performance.

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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…

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Adversarial Contract Review

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

GLM 5.11,442 words

This contract is heavily one-sided and contains numerous clauses that are either inherently exploitative or give the Client excessive discretionary power to the detriment of the Contractor. Below is a clause-by-clause analysis of the exploitable terms, suggested modifications, and the legal reasoning behind them.

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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…

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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…

GLM 5.1961 words

LEDGERLIFT (LLLT) – INVESTMENT COMMITTEE MEMO 1) Recommendation: SHORT 12-Month PT Range: $28 – $34 Thesis: LedgerLift trades at a premium multiple (8.9x NTM Revenue) subsidized by aggressive S&M spend, masking an underlying growth deceleration that will inevitably compress margins.

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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.

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Our Verdict

GLM 5.1

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

GLM 5.1

Input

$1.40

Output

$4.40

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Where to run it

15 hosts, cheapest first

GLM 5.114 hosts

HostInOutContextUptime

Baidu Qianfanfp8$0.96 in$3.03 out203k99.7% up StreamLakefp8$0.97 in$3.04 out200k99.6% up DeepInfrafp4$1.05 in$3.50 out203k99.6% up SiliconFlowfp8$1.19 in$3.74 out205k99.2% up AtlasCloudfp8$1.26 in$3.96 out203k99.6% up Alibaba Cloudfp8$1.33 in$4.18 out203k100% up

8 more hosts

Novitafp8$1.38 in$4.40 out205k99.8% up Friendli$1.40 in$4.40 out203k100% up GMI Cloudfp8$1.40 in$4.40 out203k98.8% up Nebiusfp8$1.40 in$4.40 out203k96.2% up Z.aifp8$1.40 in$4.40 out203k99.6% up Venicefp8$1.40 in$4.40 out200k97.7% up Chutesfp8degraded$0.98 in$3.08 out203k73.5% up Phaladegraded$1.21 in$4.20 out203k73.4% up

Laguna S 2.1 (free)1 host

HostInOutContextUptime

Poolsidefp4$0 in$0 out262k99.9% up

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

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