GPT-5.5 Pro

Name: GPT-5.5 Pro
Author: OpenAI

GPTv5.5 ProCurrent

OpenAI(ai lab)

Released April 23, 2026

API Docs Playground

Context1.1M tokens

Price (In / Out)$30.00/M / $180.00/M

Training CutoffDec 01, 2025

CategoryMultimodal LLM

Max Output128K tokens

About GPT-5.5 Pro

GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Designed for the toughest problems, some requests may take several minutes. It excels at FrontierMath Tier 4 (39.6%) and BrowseComp (90.1%), offering the highest intelligence available from OpenAI at a premium price point.

Capabilities

textvisioncodetool useextended thinkingweb search

Input Modalities

textimage

Output Modalities

text

Technical Details

API Identifier: openai/gpt-5.5-pro
Category: Multimodal LLM
Context Window: 1,050,000 tokens
Max Output Tokens: 128,000 tokens

Benchmarks

Performance scores for GPT-5.5 Pro across standard benchmarks.

FrontierMath Tier 4OpenAI · Apr 2026

39.6

FrontierMath Tier 1-3OpenAI · Apr 2026

52.4

HLE (with tools)OpenAI · Apr 2026

57.2

HLE (no tools)OpenAI · Apr 2026

43.1

BrowseCompOpenAI · Apr 2026

90.1

GeneBenchOpenAI · Apr 2026

33.2

GDPvalOpenAI · Apr 2026

82.3

Investment Banking ModelingOpenAI · Apr 2026

88.6

Pricing

Token pricing for GPT-5.5 Pro API usage.

Input Tokens

$30.00/M

per million tokens

Output Tokens

$180.00/M

per million tokens

No cached input discount. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Regional processing: 10% uplift.

OpenAIai lab

Creating safe AGI that benefits all of humanity

249 Tools58 MCP Servers14 ModelsFounded 2015San Francisco, CA

View full profile

249 Tools·14 Models·58 MCP Servers·5.0avg

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AI Models by OpenAI

AI models from the same organization.

Model	Context Window	Price (In / Out per M)	Capabilities
GPT-6.1 SolCurrent	1.1M	$2.00 / $10.00	textvisionreasoningcoding+4
GPT-6 SolCurrent	1.1M	$2.00 / $10.00	textvisionreasoningcoding+3
GPT-6 LunaCurrent	1.1M	$0.10 / $0.50	textvisionreasoningcoding+3
GPT-5.6 SolCurrent	1.1M	$4.00 / $20.00	textvisionreasoningcoding+5
GPT-5.6 LunaCurrent	1.1M	$0.20 / $1.20	textvisionreasoningcoding+5
GPT-5.6 TerraCurrent	1.1M	$2.00 / $12.00	textvisionreasoningcoding+5