GPT-5.5

Closed Active Multimodal gpt-5-5-2026-04-23

Frontier model for complex professional work and coding; API availability from 2026-04-24.

Released
Apr 23, 2026
Context window
1.1M tokens
Max output
128K tokens
Parameters
Not disclosed
Input price
$5.00 per 1M
Output price
$30.00 per 1M

Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.

Pricing

Launch priceApr 24, 2026
$5.00 in / $30.00 out
Current price since Apr 24, 2026
$5.00 in / $30.00 out
Cached input $0.50 per 1M

Specifications

Developer
OpenAI
Model type
Multimodal
Architecture
Not disclosed
Parameters
Not disclosed
Input
Text Image
Output
Text
Knowledge cutoff
Dec 2025
License
Proprietary
API access
First-party API
Capabilities
Agentic Coding Flagship Long context Reasoning Tool use Vision