GPT-5.5 Pro
by OpenAItext+image+file->text2 endpoints
Neura Intelligence Index
79.5/ 100
Rank
#24—
Confidence
lowBenchmarks
3(8% coverage)
Overview
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...
Capabilities
Text generation
Image understanding
Tool use / Function calling
Structured output
Extended reasoning
Long context
Modalities
Input
FileImageText
Output
Text
Technical Specifications
Context Window
1.1M tokens
Max Output
128K tokens
Knowledge Cutoff
2025-12-01
Tokenizer
GPT
Content Moderation
Enabled
Uptime (24h)
9988.7%
Country
Supported Parameters
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
Benchmark Performance
math
| Benchmark | Score | Source |
|---|---|---|
| FrontierMath | 39.6 | verified |
reasoning
| Benchmark | Score | Source |
|---|---|---|
| Humanity's Last Exam | 57.2 | verified |
agent
| Benchmark | Score | Source |
|---|
Performance Over Time
Pricing
Per 1M tokens
Input$30.00
Output$180.00