How much does GPT-5.5 cost?

GPT-5.5 costs $5 per million input tokens and $30 per million output tokens. The blended average is $17.50 per million tokens.

What is the context window of GPT-5.5?

GPT-5.5 supports a context window of 1000K tokens (1,000,000 tokens) and can generate up to 33K output tokens per request.

What is GPT-5.5 best for?

GPT-5.5 is best for: Frontier general purpose. It supports chat, vision, function_calling, code, reasoning capabilities.

GPT-5.5 — Pricing, Benchmarks & Specs

GPT-5.5

OpenAIflagship New

OpenAI's "Spud" — the first fully retrained base model since GPT-4.5. 1M context window; AAII = 59. Shipped April 23 2026, on AWS Bedrock April 28.

Context Window

tokens

Max Output

33K

tokens

Input Price

per 1M tokens

Output Price

$30

per 1M tokens

Speed

138

tokens/sec

Released

Apr 2026

2026-04-23

Blended Cost

$17.50

per 1M tokens

Value Score

5.3

quality per $

Capabilities

ChatVisionFunction CallingCode GenerationReasoning

Benchmarks

Quality Index

MMLU Pro

90.4

HumanEval (Coding)

94.6

MATH

91.2

Arena ELO

1481

Try in Playground Use via Swfte Connect OpenAI Docs

Compare With

Quality: 96·$25.00/1M

GPT-4.1

Quality: 89·$5.00/1M

Claude Opus 4

Quality: 95·$45.00/1M

About GPT-5.5

GPT-5.5 is a flagship AI model by OpenAI, released on April 23, 2026. It supports a context window of 1000K tokens and can generate up to 33K output tokens.

At $5 per million input tokens and $30 per million output tokens, its blended cost of $17.50/1M tokens places it in the premium pricing tier. Its value score of 5.3 reflects the balance of quality and cost.

Using GPT-5.5 with Swfte

Access GPT-5.5 through Swfte Connect, our unified LLM gateway. Connect gives you a single API for 50+ models, with automatic routing, cost optimization, and fallback handling. You can also try GPT-5.5 in our AI Playground before integrating.