Context Window

Compare

GPT-4o Search Preview vs MiMo-V2.5-Pro

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.

Openai

Model

GPT-4o Search Preview

Image inputTool calling

Context window

128K

128,000 tokens · ~96K words

Model page
Xiaomi

Model

MiMo-V2.5-Pro

Tool 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.

GPT-4o Search Preview128K
MiMo-V2.5-Pro1.0M

MiMo-V2.5-Pro has about 8.2× the context window of the other in this pair.

Token calculator →Memory savings →

MiMo-V2.5-Pro has 719% more context capacity (1048K vs 128K tokens).

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use MiMo-V2.5-Pro. Its 1048K context fits entire documents without chunking (vs 128K).

  • Long output (reports, code files)

    Use MiMo-V2.5-Pro. Its 131K 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.

SpecGPT-4o Search PreviewMiMo-V2.5-Pro
Context window128,000 tokens (128K)1,048,576 tokens (1048K)
Max output tokens16,384 tokens (16K)131,072 tokens (131K)
Speed tierBalancedBalanced
VisionYesNo
Function callingYesYes
Extended thinkingNoYes
Prompt cachingYesYes
Batch APIYesNo
Release dateMar 2025Apr 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.

ProviderGPT-4o Search Preview inGPT-4o Search Preview outMiMo-V2.5-Pro inMiMo-V2.5-Pro out
Openai$2.50/M$10.00/M——

Frequently asked questions

MiMo-V2.5-Pro has a larger context window: 1048K tokens vs 128K. 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