Context Window

Compare

Claude Instant 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.

Anthropic

Model

Claude Instant

Context window

100K

100,000 tokens · ~75K 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.

Claude Instant100K
Grok 4 1 Fast Reasoning Latest2M

Grok 4 1 Fast Reasoning Latest has about 20× the context window of the other in this pair.

Token calculator →Memory savings →

Grok 4 1 Fast Reasoning Latest has 1900% more context capacity (2000K vs 100K tokens). Grok 4 1 Fast Reasoning Latest is 75% 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 100K).

  • RAG / high-volume retrieval

    Use Grok 4 1 Fast Reasoning Latest. Input tokens are 75% cheaper — critical when sending large retrieved contexts.

  • 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.

SpecClaude InstantGrok 4 1 Fast Reasoning Latest
Context window100,000 tokens (100K)2,000,000 tokens (2000K)
Max output tokens8,191 tokens (8K)2,000,000 tokens (2000K)
Speed tierBalancedDeep
VisionNoYes
Function callingNoYes
Extended thinkingNoYes
Prompt cachingNoYes
Batch APIYesNo
Release dateN/AN/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.

ProviderClaude Instant inClaude Instant outGrok 4 1 Fast Reasoning Latest inGrok 4 1 Fast Reasoning Latest out
Aws Bedrock$0.800/M$2.40/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 100K. For long documents, large codebases, or extended agent sessions, the larger context window reduces the need to chunk inputs or summarize history.

Powered by Mem0

Use a smaller model.
Get better results.

Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.

Calculate your savingsLearn about Mem0

Example: a multi-turn chat session

Without Mem0~128K tokens sent
Full history
Repeated info
Old context
With Mem0~20K tokens sent
Key memories
Current turn

80% less to send — works with any model