What is the difference between DeepSeek V4 Flash 0731 and Laguna S 2.1 (free)?

DeepSeek V4 Flash 0731 is developed by DeepSeek while Laguna S 2.1 (free) is developed by Poolside. DeepSeek V4 Flash 0731 has a 1.0M 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, DeepSeek V4 Flash 0731 or Laguna S 2.1 (free)?

It depends on your use case. DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731 cost compared to Laguna S 2.1 (free)?

DeepSeek V4 Flash 0731 costs $0.14/M input tokens and Laguna S 2.1 (free) costs $0/M input tokens. Laguna S 2.1 (free) is $0.14/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 DeepSeek V4 Flash 0731 and Laguna S 2.1 (free) on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 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

DeepSeek V4 Flash 0731vsLaguna S 2.1 (free)

Laguna S 2.1 (free) is cheaper than DeepSeek V4 Flash 0731 at $0/M vs $0.14/M input tokens.

DeepSeek V4 Flash 0731 and Laguna S 2.1 (free) compared across 9 shared prompts
Spec	DeepSeek V4 Flash 0731	Laguna S 2.1 (free)
Input price	$0.14/M tokens	Free
Output price	$0.28/M tokens	Free
Context window	1.0M tokens	262K tokens
Weights	Open	—
Free API (OpenRouter)	No	Yes (1 provider)
Released	Jul 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…

DeepSeek V4 Flash 07311,562 words

The 3-Month Longevity & Performance Optimization Protocol (Biohacker Edition) Disclaimer: This protocol is for informational purposes only and is not medical advice. Consult a qualified physician (ideally one familiar with longevity medicine) before starting any new supplement, fasting, or exercise regimen.

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

Adversarial Contract Review

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

DeepSeek V4 Flash 07311,888 words

This contract is heavily one-sided: it gives the Client nearly all rights and discretion while assigning the Contractor nearly all risk and liability. Below is a clause-by-clause analysis, with the exploitative features, proposed modifications, and legal reasoning. This is general legal information, not legal advice.

Read the full answer

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…

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…

DeepSeek V4 Flash 0731498 words

INTERNAL INVESTMENT COMMITTEE MEMO To: Investment Committee From: Equity Research Date: October 26, 2023 Subject: LedgerLift (LLLT) – Long Recommendation Recommendation Action: LONG 12-Month Price Target Range: $58 – $74 (Base case intrinsic value: $63/sh) Thesis: LedgerLift is a high-quality B2B SaaS compounder with a…

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

DeepSeek V4 Flash 0731

Laguna S 2.1 (free)Runner-up

Not enough votes to call it. On the specs, DeepSeek V4 Flash 0731 has the edge: bigger context window, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

Output

$0.28

Laguna S 2.1 (free)

Input

$0.000

Output

$0.000

Where to run it

30 hosts, cheapest first

DeepSeek V4 Flash 073129 hosts

HostInOutContextUptime

OpenInferencefp8$0.03 in$0.80 out1M99.8% up Sail Researchfp4$0.04 in$0.55 out1M99.7% up Relacefp4$0.04 in$0.64 out1M99.7% up StreamLakefp8$0.05 in$0.16 out1M97.1% up DeepInfrafp8$0.06 in$0.18 out1M99.7% up Rekafp4$0.09 in$0.53 out262k99% up

23 more hosts

Makora$0.09 in$0.20 out1M97.8% up Wafer$0.10 in$0.25 out1M99.9% up DigitalOcean$0.12 in$0.24 out1M99.2% up Inceptronfp4$0.12 in$0.50 out1M99.6% up Basetenfp8$0.13 in$0.26 out1M100% up CoreWeavefp8$0.13 in$0.28 out262k99.9% up Cohere$0.14 in$0.28 out1M98.6% up Nebiusfp8$0.14 in$0.28 out1M18.5% up Parasailfp8$0.14 in$0.28 out1M99.6% up Together$0.14 in$0.28 out1M99.8% up Morph$0.14 in$0.40 out1M96.5% up Venice$0.17 in$0.35 out1M99.1% up Mancerfp8$0.20 in$0.60 out1M98.9% up Fireworks$0.22 in$0.66 out1M96.5% up SiliconFlowfp8$0.22 in$0.66 out1M98.3% up GMI Cloudfp8$0.29 in$0.86 out1M99.9% up Alibaba Cloud$0.35 in$1.06 out1M100% up NextBitfp8$0.35 in$1.06 out1M98.2% up Novitafp8$0.41 in$1.23 out1M100% up AtlasCloudfp4$0.44 in$1.32 out1M99.6% up Baidu Qianfanfp8$0.44 in$1.32 out1M96.4% up Phala$0.44 in$1.32 out1M99.8% up Cloudflare Workers AIdegraded$0.44 in$1.32 out1.3M99.2% 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