OpenAI: GPT-5.5 Pro
Released Apr 24, 2026Try it on:
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...
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Pricing
Per token
- Input (per 1M)
- $30.00
- Output (per 1M)
- $180.00
Per unit
- Web search
- $0.010/call
Capabilities
Modality
text+image+file->textContext
1.1M tokens
Tokenizer
GPT
Knowledge cutoff
2025-12-01
Max output
128K tokens
Moderation
Moderated
Supported parameters
include_reasoning
max_tokens
reasoning
response_format
seed
structured_outputs
tool_choice
tools
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