Context Window

Compare

DeepSeek V3.1 vs Grok 4 1 Fast Reasoning Latest

This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.

Deepseek

Model

DeepSeek V3.1

Tool calling

Context window

164K

163,840 tokens · ~123K words

Model page
Xai

Model

Grok 4 1 Fast Reasoning Latest

Image inputTool calling

Context window

2M

2,000,000 tokens · ~1.5M words

Model page

Context window · side by side

Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.

DeepSeek V3.1164K
Grok 4 1 Fast Reasoning Latest2M

Grok 4 1 Fast Reasoning Latest has about 12.2× the context window of the other in this pair.

Token calculator →Memory savings →

Grok 4 1 Fast Reasoning Latest has 1120% more context capacity (2000K vs 163K tokens). Grok 4 1 Fast Reasoning Latest is 0% cheaper on input.

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use Grok 4 1 Fast Reasoning Latest. Its 2000K context fits entire documents without chunking (vs 163K).

  • Long output (reports, code files)

    Use Grok 4 1 Fast Reasoning Latest. Its 2000K max output lets you generate complete artifacts in one request.

Full specs

Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.

SpecDeepSeek V3.1Grok 4 1 Fast Reasoning Latest
Context window163,840 tokens (163K)2,000,000 tokens (2000K)
Max output tokens163,840 tokens (163K)2,000,000 tokens (2000K)
Speed tierBalancedDeep
VisionNoYes
Function callingYesYes
Extended thinkingYesYes
Prompt cachingYesYes
Batch APINoNo
Release dateAug 2025N/A

Pricing matrix

Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.

ProviderDeepSeek V3.1 inDeepSeek V3.1 outGrok 4 1 Fast Reasoning Latest inGrok 4 1 Fast Reasoning Latest out
Openrouter$0.200/M$0.800/M——
Xai——$0.200/M$0.500/M

Frequently asked questions

Grok 4 1 Fast Reasoning Latest has a larger context window: 2000K tokens vs 163K. For long documents, large codebases, or extended agent sessions, the larger context window reduces the need to chunk inputs or summarize history.

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Without Mem0~128K tokens sent
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Repeated info
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