OpenAI
OpenAI GPT-6 model for focused, high-volume workloads where cost efficiency is the priority.
1.05M ctxUSD 0.10 / 1M input tok; USD 0.50 / 1M output tok
Introducing GPT-5.5 (and Pro)OpenAIReleased April 16, 2026
GPT-5.5 (and Pro)
A new class of intelligence for advanced coding and professional knowledge work with a 1.05M context window and 128K output capacity.
reasoning-llmProprietary API$5.00 / 1M tok (Professional Class)Context: 1.05M (1,050,000 tokens)Arena ELO: 1490
Technical Specifications
Architecture Type
Frontier Professional Reasoning Model
Total Parameters
Frontier Scale
Context Window
1.05M (1,050,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
December 2025
Supported Modalities
text, code, vision, reasoning
License & Access
OpenAI Business Terms
Benchmark Evaluations
Math500
98.5
Mmlu Pro
90.4
Humaneval
98.8
Swe Bench Verified
74
Chatbot Arena ELO
1490
Deep Architectural Overview
GPT-5.5 sets a new standard for high-stakes enterprise workflows. Achieving 90.4% on MMLU-Pro and 74% on SWE-bench, it reliably navigates multifaceted corporate, legal, and financial analytical tasks with configurable reasoning effort.
Strengths & Considerations
Core Strengths
- First model to break 90% on MMLU-Pro
- 1,050,000 context window
- 128k output buffer for comprehensive syntheses
Known Limitations
- Higher token pricing ($5/$30) tailored for complex professional work
Token & API Pricing
Input Tokens (1M)$5.00
Output Tokens (1M)$30.00
Cached Input (1M)$0.5000
Pricing is verified directly against OpenAI's developer documentation and API rate sheets.
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