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DeepSeek V3.1

by DeepSeek

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

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Quick Facts

Provider

DeepSeek

Model ID

deepseek/deepseek-chat-v3.1

Modality

Text to Text

Tier

Premium

Last Updated

2026-07-12

Released

2025-08-21

Context Length

164K tokens

Tokenizer

DeepSeek

Input Price

$0.21/M

Output Price

$0.79/M

When To Use DeepSeek V3.1

Best for

  • Reasoning-heavy questions and step-by-step analysis
  • Research, summarization, and document work
  • Comparing DeepSeek responses against other leading AI models

Not ideal for

  • High-volume casual chats where you want to conserve premium credits
  • Native image generation workflows
  • Prompts that require image or screenshot understanding
  • Voice, speech, or audio transcription workflows

Input & Output

Accepts

text

Generates

text

Pricing

All prices are per 1 million tokens

Input

$0.21/M

Output

$0.79/M

Cache Read

$0.13/M

Capabilities

  • Natural language understanding and generation
  • Advanced reasoning and problem-solving
  • Long context window for extended conversations

Example Prompts

Solve this problem step by step, then summarize the final answer in one paragraph.

Summarize these notes into key findings, risks, and recommended next steps.

Compare how DeepSeek V3.1 and two other models answer this prompt.

Use DeepSeek V3.1 to produce a concise answer, then list assumptions and tradeoffs.

Supported Parameters

frequency_penaltyinclude_reasoninglogit_biasmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_p

Compare and Use DeepSeek V3.1

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Frequently Asked Questions

Try DeepSeek V3.1 In Related Workflows

Model pages work best when they connect to real tasks. Use these bots and utilities to test DeepSeek V3.1 against coding, research, and model-selection workflows.

AI Code Reviewer Bot

Test the model on code review, bug finding, edge cases, and test planning.

AI Research Assistant Bot

Use the model for source synthesis, evidence review, and decision briefs.

AI Model Picker Quiz

Check whether this model fits your task before opening a chat.

Try DeepSeek V3.1

Use DeepSeek V3.1 on RyddleAI

Access DeepSeek V3.1 with a RyddleAI subscription.

Try DeepSeek V3.1 View Pricing Compare Models

Compare DeepSeek V3.1 With Alternatives

Use these nearby models to test whether DeepSeek V3.1 is the right choice for your prompt, budget, and model family preference.

AlternativeProviderTierWhy comparePage
DeepSeek V4 ProDeepseekPremiumAnother DeepSeek model to compare within the same provider familyView model
DeepSeek V4 FlashDeepseekFreeAnother DeepSeek model to compare within the same provider familyView model
Qwen3.7 MaxQwenPremiumSame tier alternative from another providerView model
Grok Build 0.1X-aiPremiumSame tier alternative from another providerView model

DeepSeek V4 Pro

Deepseek

DeepSeek V4 Flash

Deepseek

Free

Qwen3.7 Max

Qwen

Grok Build 0.1

X-ai