← All models
OpenAI: GPT-5.5
openai/gpt-5.5
VisionTool useJSONReasoningStreaming
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...
Pricing
Input
$5.00 / 1M
Output
$30.00 / 1M
Specs
Context
1,050,000 tokens
Input
file, image, text
Output
text
Knowledge cutoff: 2025-12-01
Released: 2026-04
Supported parameters
include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools