Context Window
OpenaiGPT-4obalancedTool use

Gpt 4o Realtime Preview 2025 06 03

128K context·~96K words·4K max output
View context detailsCompare with Amazon Titan Text Express
Context window128Ktokens
Max output4Ktokens

Context window

This model accepts 128K tokens in one request (~96K words of text).

Context window size128K tokens
4K32K128K1M10M

What fits in one request

  • Short document
    About 1,500 words of text
    Fits
  • Long document
    About 37K words of text
    Fits
  • Small codebase
    About 150K words of text
    Won't fit
  • Full novel
    About 375K words of text
    Won't fit

Specifications

Context size, pricing, and release info in one place.

Context window
128,000 tokens (128K)
Max output tokens
4,096 tokens (4K)
Speed tier
balanced
Provider
Openai
Model family
GPT-4o
Input cost
$5.00/M / 1M tokens
Output cost
$20.00/M / 1M tokens
Cached input
$2.50/M / 1M tokens

Capabilities

See which features this model supports, such as vision, tools, and streaming.

Supported (5)
Tool use
Supported
Function calling
Supported
Streaming
Supported
Batch API
Supported
Prompt caching
Supported
Not supported (3)
Vision
Not supported
Extended thinking
Not supported
Web search
Not supported

Best for

Jump to a guide or ranking that matches each workload.

AI agentsLong documentsRAG

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Frequently asked questions

Short answers about context size and how this model behaves.

Gpt 4o Realtime Preview 2025 06 03 has a context window of 128K tokens (128,000 tokens). This covers most professional use cases including large code files, lengthy reports, and long conversation histories.

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Without Mem0~128K tokens sent
Full history
Repeated info
Old context
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