Context Window

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Gemini 2.5 Flash vs Gpt 4o Mini Audio Preview

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.

Google

Model

Gemini 2.5 Flash

Image inputTool calling

Context window

1M

1,000,000 tokens · ~750K words

Model page
Openai

Model

Gpt 4o Mini Audio Preview

Tool calling

Context window

128K

128,000 tokens · ~96K 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.

Gemini 2.5 Flash1M
Gpt 4o Mini Audio Preview128K

Gemini 2.5 Flash has about 7.8× the context window of the other in this pair.

Token calculator →Memory savings →

Gemini 2.5 Flash has 681% more context capacity (1000K vs 128K tokens). Gpt 4o Mini Audio Preview is 50% cheaper on input.

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use Gemini 2.5 Flash. Its 1000K context fits entire documents without chunking (vs 128K).

  • RAG / high-volume retrieval

    Use Gpt 4o Mini Audio Preview. Input tokens are 50% cheaper — critical when sending large retrieved contexts.

  • Long output (reports, code files)

    Use Gemini 2.5 Flash. Its 1000K 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.

SpecGemini 2.5 FlashGpt 4o Mini Audio Preview
Context window1,000,000 tokens (1000K)128,000 tokens (128K)
Max output tokens1,000,000 tokens (1000K)16,384 tokens (16K)
Speed tierFastFast
VisionYesNo
Function callingYesYes
Extended thinkingYesNo
Prompt cachingYesNo
Batch APINoYes
Release dateJun 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.

ProviderGemini 2.5 Flash inGemini 2.5 Flash outGpt 4o Mini Audio Preview inGpt 4o Mini Audio Preview out
Deepinfra$0.300/M$2.50/M——
Google$0.300/M$2.50/M——
Google Vertex$0.300/M$2.50/M——
Openai——$0.150/M$0.600/M
Openrouter$0.300/M$2.50/M——
Replicate$2.50/M$2.50/M——

Frequently asked questions

Gemini 2.5 Flash has a larger context window: 1000K 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.

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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