How much does GPT-5.5 cost?

GPT-5.5 costs $5.00 per million input tokens and $30 per million output tokens on standard pricing. A workload of 20M input and 5M output tokens a month is about $250.

What is the context length of GPT-5.5?

GPT-5.5 accepts up to 1,050,000 tokens (1.1M) of input and can return up to 128,000 tokens in one response.

Does GPT-5.5 support tool calling and structured outputs?

Yes, GPT-5.5 supports function/tool calling and structured (JSON) outputs. Supported tools: Function calling, Structured outputs, JSON mode, Reasoning, Deterministic seed, Prompt caching.

What inputs and outputs does GPT-5.5 support?

GPT-5.5 accepts PDF, Image, Text as input and produces Text as output.

When was GPT-5.5 released?

GPT-5.5 was released by OpenAI in 2026-04-24.

GPT-5.5

gpt-5.5

API Provider site

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token... Built by OpenAI.

Prices updated recently

Input price

$5.00

per 1M tokens · Standard

Output price

$30

per 1M tokens · Standard

Input limit

1.1M

tokens

Output limit

128K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF

Compare

GPT-5.5 price history

2 price records since 9/25/2026

GPT-5.5 cost calculator

Input20M tokens

Output5M tokens

$250/month

Standard pricing

Overview

What is GPT-5.5?

GPT-5.5 is a text & reasoning and vision model from OpenAI. GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token... Its 1.1M context window and $5.00 input price make it a candidate for quality-focused production applications.

Image understandingDocument analysisContent workflowsClassification

Benchmarks

GPT-5.5 benchmarks & speed

How GPT-5.5 scores on standardized evaluations, and where it lands among every model we track.

38.4

Intelligence Index

Better than 84% of 153 models

94tok/s

Output speed

Better than 51% of 119 models

1264

DesignArena Elo

Better than 66% of 81 models

Reasoning

GPQA Diamond

93.5%

Graduate-level scientific reasoning · top 7%

HLE

45.8%

Humanity's Last Exam · top 10%

Coding

SciCode

55.8%

Python for scientific computing · top 25%

Latency & design

Time to first token: 41.47s
DesignArena win rate: 53.5%
Design battles judged: 31,251

Independent scores from Artificial Analysis and DesignArena · updated 10/8/2026. Higher is better; ranks compare against every model we track with that score.

Rates

GPT-5.5 pricing

Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

Input · Standard

$5.00

Per 1M tokens

Cached input · Standard

$0.50

Per 1M tokens

Capabilities

GPT-5.5 Tools

Tools available when using GPT-5.5 through supported provider APIs.

Function calling

Supported

Structured outputs

Supported

JSON mode

Supported

Reasoning

Supported

Built-in web search

Not supported

Log probabilities

Not supported

Deterministic seed

Supported

Parallel tool calls

Not supported

Prompt caching

Supported

Strengths and limitations

Strengths

Measured results (AA Intelligence 38.4 · DesignArena Elo 1264) position it for demanding production work.
1.1M context supports large documents, repositories and extended conversations.
Supports text & reasoning and vision workloads in one model.

Limitations

Generated tokens cost 6× more than input tokens, which matters for verbose responses.
Large context capacity does not guarantee consistent retrieval across the entire prompt.
Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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