Active

Apr 23, 2026

ProducerOpenAI

FamilyGPT

APIHosted UICloud

GPT-5.5

LLMMultimodalReasoningTool-Using

GPT-5.5 is OpenAI's newest frontier model, focused on agentic coding, computer use, knowledge work, and scientific research with a 1M-token context window.

Technical specification

Context window

Max output

Tools

Yes

Fine-tuning

Weights access

Closed

Knowledge cutoff

Dec 2025

Last updated: Apr 25, 2026

Modalities

Input

Text

Image

Output

Text

Code

Structured data

Capabilities

Reasoning★

Reasoning

Multi-step reasoning★

Reasoning

Long context★

Reasoning

Coding★

Coding

Function Calling

Planning

Structured output★

Structured gen.

Audio understanding

Audio

Image understanding★

Vision

Video Understanding

Other

Chart understanding

Vision

Diagram reasoning

Reasoning

OCR★

Vision

Multilingual★

Language

Planning★

Planning

Streaming output

Reasoning

Interleaved Multimodal Input

Reasoning

Multimodal understanding★

Multimodality

Pricing

Apr 25, 2026Source

PublicUSDper 1M tokens

Standard API: $5.00/1M input tokens, $0.50/1M cached input, $30.00/1M output. Batch and Flex: half the standard rate. Priority: 2.5× the standard rate. GPT-5.5 Pro API: $30.00/1M input, $180.00/1M output. For requests exceeding 272K input tokens, pricing increases to 2× input and 1.5× output for the entire session.

Pricing · Calculator

Token volume10K

INPUT

$5.0000 / per 1M tokens

$0.0500

OUTPUT

$30.0000 / per 1M tokens

$0.3000

CACHE

$0.5000 / per 1M tokens

$0.00500

TOTAL

for 10K tokens

$0.3500

All plans3

TextStandard/ per 1M tokens

Input$5.0000

Cache$0.5000

Output$30.0000

For prompts exceeding 272K input tokens: 2x input and 1.5x output pricing applies for the entire session.

TextBatch/ per 1M tokens

Input$2.5000

Output$15.0000

Batch and Flex: half the standard rate.

TextPriority/ per 1M tokens

Input$12.5000

Output$75.0000

Priority processing: 2.5x the standard rate.

Security and enterprise

OpenAI rates GPT-5.5's cyber and biological capabilities as High under the Preparedness Framework. The model underwent a full safety and governance process, including targeted evaluations for advanced cyber and biological capabilities and testing with external experts.

Official Privacy CenterUpdated: April 25, 2026