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OpenAI: GPT-5.5 Pro
openai/gpt-5.5-pro
VisionTool useJSONReasoningStreaming
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Pricing
Input
$30.00 / 1M
Output
$180.00 / 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_tokensreasoningresponse_formatseedstructured_outputstool_choicetools