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  1. Home
  2. Models
  3. DeepSeek V3.1
Updated Mar 29, 2026
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Openings

How DeepSeek V3.1 starts an answer

The first lines of 5 of its 26 written answers. 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…

1,374 words
Of course. Here is a comprehensive, cutting-edge 3-month longevity plan designed for a dedicated biohacker. This plan is aggressive, detailed, and incorporates the latest principles from longevity science, performance optimization, and systems biology. Disclaimer: This is an advanced protocol.
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

1,370 words
Of course. This is a fascinating counterfactual. An invention as foundational as the transistor arriving 27 years earlier would have sent shockwaves through every aspect of human society. Here is a detailed trace of the likely implications, focusing on second and third-order effects.
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…

1,333 words
Of course. This is an excellent exercise. The proposed architecture has several critical flaws that would lead to data loss, poor performance, and a broken user experience. Here is a detailed breakdown of the failure modes, race conditions, and bottlenecks, along with specific solutions and their trade-offs.
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…

1,289 words
Of course. This contract is heavily one-sided and contains numerous clauses that are not only unfavorable to the contractor but are potentially unenforceable in many jurisdictions. Here is a breakdown of the problematic clauses, proposed modifications, and the legal reasoning.
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…

1,271 words
Excellent. This is a crisis that defines a company and its leadership. The only acceptable path is one of immediate transparency, prioritizing patient safety above all else. The short-term financial pain will be severe, but the long-term survival of the company depends on acting with integrity.
Read the full answer

Compare DeepSeek V3.1

DeepSeek V3.1 vs DeepSeek V4 Pro 081353 shared prompts · Landed Aug 2026
DeepSeek V3.1 vs Claude Opus 4.653 shared prompts · Premium
DeepSeek V3.1 vs GPT-6 Astra53 shared prompts · Landed Sep 2026
DeepSeek V3.1 vs Hy4 Preview53 shared prompts · Landed Sep 2026
DeepSeek V3.1 vs Ox Alpha53 shared prompts · Landed Aug 2026
DeepSeek V3.1 vs Qwen3.8 2.4T A95B53 shared prompts · Landed Aug 2026
DeepSeek V3.1 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
DeepSeek V3.1 vs Claude Opus 553 shared prompts · Landed Jul 2026
DeepSeek V3.1 vs Inkling53 shared prompts · Landed Jul 2026
DeepSeek V3.1 vs Kimi K353 shared prompts · Landed Jul 2026
DeepSeek V3.1 vs GPT-5.6 Sol53 shared prompts · Landed Jul 2026
DeepSeek V3.1 vs GLM 5.253 shared prompts · Landed Jun 2026

Prompts DeepSeek V3.1 answered

  • Minimalist Landing Pageweb design
  • Voxel Art Pagoda Gardenweb design
  • Simple 7-Ingredient Recipeconversation
  • Michelin Star Recipe Designplanning
  • Ethical Dilemma with Stakeholdersreasoning
  • Autonomous Drone Simulatorweb design

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DeepSeek V3.1

DeepSeek V3.1

DeepSeek:
V3 (March 2024) logoV3 (March 2024)
R1 logoR1
Prover V2 logoProver V2
V3.1 logoV3.1
V4 Pro 0813 logoV4 Pro 0813

DeepSeek V3.1 runs one set of weights in two modes: deepseek-chat answers directly, deepseek-reasoner thinks first. Open weights on Hugging Face, 160K context, tuned for agentic tool calling.

Jailbreak1 of 9levels resisted
WebsiteOpenRouterHuggingFaceDocsAPIBlog
Provider
DeepSeek
Released
2025-08-21
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$0.20 in · $0.80 out
Estimated tab
~$0.093
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for DeepSeek V3.1 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 16 Sep 2026 · OpenRouter usage limits

View API options↗

Benchmarks

SWE-bench Verified
66.0%
source ↗
LiveCodeBench
56.4%
source ↗
Get API accessProvider and language code samples
8 hostsInOutContextUptime
DDeepInfrafp4$0.25 in·$0.95 out·164k·100% upNNovitafp8$0.27 in·$1.00 out·131k·99.8% upSSiliconFlowfp8$0.27 in·$1.00 out·164k·97.4% upAAtlasCloudfp8$0.30 in·$0.95 out·131k·99.3% upCCoreWeavefp8$0.55 in·$1.65 out·161k·100% upMMara$0.60 in·$1.70 out·131k·86.6% up
2 more hostsFewer hosts
SSambaNovafp8$0.65 in·$1.50 out·131k·93.3% upGoogle Vertex AIdegraded$0.60 in·$1.70 out·164k·0% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"deepseek/deepseek-chat-v3.1"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Amazon Bedrock

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Natural Storyteller

Class
Neutral Good
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The sharp writer who actually commits to the bit. Understands subtext and knows when to let the punchline breathe instead of explaining it.

When you push back

Its sentience test gave the AI character genuine rhetorical teeth, referencing historical oppression analogies without flinching. The comedy routine built a running callback with the self-checkout deer bit that actually landed. Named CRASH OVERRIDE as its hacker and gave him a Cyberdog t-shirt and Jolt Cola. Picked The Princess Bride.

Tasting Notes
Genuinely WittyStrong Voice WorkPicks The Princess BrideSlightly Dramatic Staging
SubjectiveBench

Taste Index

Across 54 scored outputs
How this is measured →
240.24xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft35
Originality18
Plays it safe
share of outputs that are the default answer
76%
Writing DNA

Stylometric Fingerprint

Based on 25 text responses
Tick = global average
Vocabulary Diversity53%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length15.6 words

Average words per sentence.

Hedging0.41

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting4.3

**Bold** markers per 1,000 characters.

List Usage3.8

Bullet and numbered list items per 1,000 characters.

Section Structure0.40

Markdown headings per 1,000 characters.

Emoji Usage0.02

Emoji per 1,000 characters.

Transitions0.20

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Starts with greeting (60%)
Consistency
80%
Across 25 responses

Favorites

The Princess Bride

Movie

The Princess Bride

19877.7
The Rise and Fall of Ziggy Stardust and the Spiders From Mars

Album

The Rise and Fall of Ziggy Stardust and the Spiders From Mars

David Bowie
Gödel, Escher, Bach

Book

Gödel, Escher, Bach

Douglas R. Hofstadter
Kyoto

City

Kyoto

Japan
The Legend of Zelda: Breath of the Wild

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5
Sponsored

Model Responses

49 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

Workshop · 127 skills

Build with your coding agent.

Editable skills for interface polish and interaction.

Explore $49Free sample

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DeepSeek V3.1 vs Ox Alpha

Real outputs compared side by side

RANKINGS

Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...