GPT-5.5
Language modelPrevious generationCard summarizedA new class of intelligence for coding and professional work.
Active (legacy)● Re-checked 12 Oct 2026 · 112 facts · 0 corrections · 3 unconfirmedSource: GPT-5.5 System Card (46 pp)
Use it via API
Where to call it
- OpenAI API
gpt-5.5
Supports
- Image input
- Streaming
- Structured outputs
- Reasoning control
- Tool calling
- Web search
- Prompt caching
- Batch API
Good for
- Complex real-world work: writing code, researching online, analyzing information, creating documents and spreadsheets, moving across tools
- Understands the task earlier, asks for less guidance, uses tools more effectively and checks its work
- Individual claims 23% more likely to be factually correct than GPT-5.4 on user-flagged cases
Overview
GPT-5.5
A new class of intelligence for coding and professional work.
- Cost
- $5.00 in
- Context
- 1.05M
- Input / output
- $5.00 / $30.00
- Max output
- 128K
- Knows up to
- December 2025
- Released
- 24 Apr 2026
OpenAI's system card for GPT-5.5, a model for complex real-world work such as coding, online research, analysis and multi-tool tasks. OpenAI treats it as High capability in biology and chemistry and in cybersecurity (below Critical), and below High in AI self-improvement. It is a step up in cyber capability over GPT-5.4 Thinking, so OpenAI expanded its cyber safeguards and limits scaled agentic vulnerability research to its Trusted Access for Cyber program. Safety results also stand in for GPT-5.5 Pro, the same model with parallel test-time compute. p.5, p.22, p.41–42
gpt-5.5- Input / output per 1M
- $5.00 / $30.00
- Context window
- 1.05M
- Max output
- 128K
- Knows up to
- December 2025
- Reasoning
- Configurable (effort none → xhigh)
- Weights
- Closed
About this card. A model card is the maker's own account of a model: what it's for, how it was trained and tested, and where it falls short. This page condenses OpenAI's GPT-5.5 System Card. Every claim carries its source page.