GPT-5.5 Pro
OpenAIReleased 2026-04 · o200k_base tokenizer
Pricing
Input
$30.00 /M tokens
Cached input
—
Output
$180 /M tokens
Specs
Context window
272K tokens
Max output
16.4K tokens
Features
VisionTools Caching ReasoningStructured
Released 2026-04 · o200k_base tokenizer
Input
$30.00 /M tokens
Cached input
—
Output
$180 /M tokens
Context window
272K tokens
Max output
16.4K tokens