Context Window

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Anthropic Claude vs Gemini 3.1 Pro Preview Custom Tools

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

Anthropic Claude

Context window

100K

100,000 tokens · ~75K words

Model page
Google

Model

Gemini 3.1 Pro Preview Custom Tools

Image inputTool calling

Context window

1.0M

1,048,576 tokens · ~786K 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.

Anthropic Claude100K
Gemini 3.1 Pro Preview Custom Tools1.0M

Gemini 3.1 Pro Preview Custom Tools has about 10.5× the context window of the other in this pair.

Token calculator →Memory savings →

Gemini 3.1 Pro Preview Custom Tools has 948% more context capacity (1048K vs 100K tokens). Gemini 3.1 Pro Preview Custom Tools is 75% cheaper on input.

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use Gemini 3.1 Pro Preview Custom Tools. Its 1048K context fits entire documents without chunking (vs 100K).

  • RAG / high-volume retrieval

    Use Gemini 3.1 Pro Preview Custom Tools. Input tokens are 75% cheaper — critical when sending large retrieved contexts.

  • Long output (reports, code files)

    Use Gemini 3.1 Pro Preview Custom Tools. Its 65K 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.

SpecAnthropic ClaudeGemini 3.1 Pro Preview Custom Tools
Context window100,000 tokens (100K)1,048,576 tokens (1048K)
Max output tokens8,191 tokens (8K)65,536 tokens (65K)
Speed tierBalancedFast
VisionNoYes
Function callingNoYes
Extended thinkingNoYes
Prompt cachingNoYes
Batch APIYesNo
Release dateN/AFeb 2026

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.

ProviderAnthropic Claude inAnthropic Claude outGemini 3.1 Pro Preview Custom Tools inGemini 3.1 Pro Preview Custom Tools out
Aws Bedrock$8.00/M$24.00/M——
Google——$2.00/M$12.00/M
Google Vertex——$2.00/M$12.00/M

Frequently asked questions

Gemini 3.1 Pro Preview Custom Tools has a larger context window: 1048K 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.

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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.

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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