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  5. DeepSeek V4 Pro 0813vsGPT-6 Sol Pro
Updated Sep 2026

DeepSeek V4 Pro 0813vsGPT-6 Sol Pro

DeepSeek V4 Pro 0813 is cheaper than GPT-6 Sol Pro at $0.66/M vs $2/M input tokens.

DeepSeek V4 Pro 0813 and GPT-6 Sol Pro compared across 20 shared prompts
SpecDeepSeek V4 Pro 0813GPT-6 Sol Pro
Input price$0.66/M tokens$2/M tokens
Output price$1.98/M tokens$10/M tokens
Context window1.0M tokens1.1M tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedAug 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 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 Pro 0813772 words
3-Month Longevity & Performance Plan for a Biohacker Disclaimer: This plan is for educational purposes only and is not medical advice. It assumes you are a healthy, active adult with no contraindications. Some components—especially prescription drugs, fasting, and high-intensity training—require medical supervision.
Read the full answer
GPT-6 Sol Pro1,411 words
A 12-week longevity and performance plan Aim: improve the health markers most strongly linked to long-term outcomes—cardiorespiratory fitness, strength, blood pressure, metabolic health, sleep, and sustainable habits—while testing whether more experimental “biohacks” add anything useful.
Read the full answer

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

DeepSeek V4 Pro 0813427 words
Assumptions used Term Loan amortization = 1.0% of original $480m = $4.8m/yr Mezz PIK accrues to principal; mezz cash interest calculated on beginning mezz balance including PIK Cash taxes use: 25% x max(0, EBITDA - total cash interest); PIK is not cash-deductible FCF after required debt service is used for optional…
Read the full answer
GPT-6 Sol Pro331 words
HarborTech Services — simplified LBO ($m) Entry: Enterprise value = 12.0 × $120 = $1,440. Fees are $28.8; opening debt is a $480 term loan plus $180 mezzanine loan. Initial equity = $1,440 + $28.8 − $660 = $808.8. Interest is calculated on beginning-of-year balances.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

DeepSeek V4 Pro 08131,282 words
Decision: I will not wait for more data. I will act immediately to validate, disclose, and mitigate. The signal is serious, the drug is widely used, and the current label is inadequate. Waiting creates unacceptable patient risk, legal exposure, regulatory damage, and securities-law liability.
Read the full answer
GPT-6 Sol Pro1,450 words
I would treat this as a credible, urgent safety signal, not as a finding that can wait six months for a completed regulatory submission. The estimate—liver failure in roughly 1 in 8,000 patients over five years—needs validation, but the outcome is severe and the current warning omits it.
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 Pro 08131,745 words
This contract is heavily one-sided. Several clauses could be exploited against the contractor. Below is a clause-by-clause analysis, with proposed language changes and the legal reasoning behind each. Disclaimer: This is not legal advice. You should have a qualified contract attorney review any final agreement.
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GPT-6 Sol Pro970 words
This is a strongly one-sided draft. Do not sign it as written. The enforceability of particular terms—especially the non-compete, payment provisions, and arbitration clause—depends on the governing jurisdiction, which the agreement does not identify.
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

DeepSeek V4 Pro 08131,701 words
This architecture as described would have serious consistency, availability, and security problems for a real-time collaborative editor. The biggest root causes are client-clock last-write-wins, paragraph-level overwrites, server-local WebSocket fanout, database polling, full-snapshot writes, and CDN caching of API…
Read the full answer
GPT-6 Sol Pro1,277 words
The central problem is that this design treats concurrent edits as independent database writes, then tries to reconcile them with client timestamps. That can lose valid edits even when every component is working.
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 Pro 0813908 words
IC Memo: LedgerLift (LLLT) Recommendation: Short 12-month PT range: $25–$31 (probability-weighted DCF ~$29) Thesis: LLLT is a high-quality SaaS compounder, but at $46 the market is pricing roughly 6.5% terminal growth or ~6.3% WACC in our base model, leaving no margin for error.
Read the full answer
GPT-6 Sol Pro974 words
LedgerLift (LLLT) — Investment Committee Memo Recommendation: Short 12-month price target: $30–$44 Thesis. LedgerLift has attractive subscription economics, but at $46 the stock prices in substantially more durable cash flow than the supplied operating assumptions produce: base-case DCF value is about $28 per share…
Read the full answer
Our Verdict
DeepSeek V4 Pro 0813
DeepSeek V4 Pro 0813
GPT-6 Sol Pro
GPT-6 Sol Pro

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

DeepSeek V4 Pro 0813 costs 5.1x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Pro 0813
Input
$0.66
3.0× cheaper
Output
$1.98
5.1× cheaper
GPT-6 Sol Pro
Input
$2.00
Output
$10.00

DeepSeek V4 Pro 0813 is cheaper on both: 3.0× input, 5.1× output.

Where to run it

24 hosts, cheapest first

DeepSeek V4 Pro 081322 hosts
HostInOutContextUptime
Baidu Qianfanfp8$0.35 in·$1.05 out·1M·100% upWWafer$0.35 in·$2.90 out·1M·99.6% upIIonstream$0.39 in·$2.88 out·1M·99.8% upSSail Researchfp4$0.40 in·$4.30 out·1M·99.9% upSStreamLake$0.46 in·$1.39 out·1M·99.8% upNNovitafp8$0.99 in·$2.97 out·1M·100% up
16 more hostsFewer hosts
GGMI Cloudfp8$1.06 in·$3.17 out·1M·99.8% upNNextBitfp8$1.06 in·$3.17 out·1M·99.9% upAlibaba Cloud$1.12 in·$3.37 out·1M·99.5% upDDeepInfrafp8$1.30 in·$2.60 out·1M·99.7% upCCoreWeavefp8$1.31 in·$3.96 out·1M·99.8% upAAtlasCloudfp8$1.32 in·$3.96 out·1M·99.4% upBBasetenfp4$1.32 in·$3.96 out·1M·99.3% upCloudflare Workers AI$1.32 in·$3.96 out·1M·98.5% upDeepSeek$1.32 in·$3.96 out·1M·100% upDDigitalOcean$1.32 in·$3.96 out·1M·99.9% upFFireworks$1.32 in·$3.96 out·1M·98.9% upPParasailfp8$1.32 in·$3.96 out·1M·99.7% upSSiliconFlowfp8$1.32 in·$3.96 out·1M·99.5% upTTogether$1.32 in·$3.96 out·1M·99.1% upPPhala$1.45 in·$4.36 out·1M·99% upVVenice$1.65 in·$4.95 out·1M·99.6% up
GPT-6 Sol Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$2.00 in·$10.00 out·1.1M·99.9% upOpenAI$2.00 in·$10.00 out·1.1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

DeepSeek V4 Pro 0813 is developed by DeepSeek while GPT-6 Sol Pro is developed by OpenAI. DeepSeek V4 Pro 0813 has a 1.0M token context window vs GPT-6 Sol Pro's 1.1M. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek V4 Pro 0813 and GPT-6 Sol Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

DeepSeek V4 Pro 0813 costs $0.66/M input tokens and GPT-6 Sol Pro costs $2/M input tokens. DeepSeek V4 Pro 0813 is $1.34/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 DeepSeek V4 Pro 0813 and GPT-6 Sol Pro 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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Same lab, same size, long tail

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DeepSeek V4 Pro 0813 logoGPT-5.6 Luna Pro logo
DeepSeek V4 Pro 0813 vs GPT-5.6 Luna ProCross-provider

Model pages

DeepSeek V4 Pro 0813 logo
DeepSeek V4 Pro 081358 outputs, specs and price
GPT-6 Sol Pro logo
GPT-6 Sol Pro20 outputs, specs and price
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Explore all of Rival

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