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openaiOpenAI: GPT-5.5
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...
openai/gpt-5.5
Context Size
1,050K
Input Price
500,000 Ks/M
Output Price
3,000,000 Ks/M
Architecture
File
Image
Text
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools
Details
TokenizerGPT
Max Completion128,000 tokens
Provider Context1,050K tokens
ModeratedYes
CreatedApr 24, 2026