GPT-5.5
GPT-5.5 is a frontier model developed by OpenAI designed to handle complex professional tasks. It supports text, file, and image inputs and features advanced reasoning capabilities and tool calling functionality.
GPT-5.5 specs and pricing
- Provider: OpenAI
- Released: April 24, 2026
- Context window: 1.1M tokens
- Max output: 128K tokens
- Input: files, images, text
- Output: text
- Price: $5.00 input / $30 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What GPT-5.5 is good at
- Analyzing large sets of documents or files
- Complex reasoning tasks requiring high reliability
- Professional workflows involving image and text integration
To-dos to try with GPT-5.5
- Upload a 500-page technical manual and summarize the safety protocols for specific hardware components.
- Analyze a series of architectural diagrams and generate a list of potential structural inconsistencies.
- Process a collection of research papers to identify common themes and conflicting data points.
FAQ
- What types of files can I provide to GPT-5.5? The model accepts text, images, and various file types as input.
- Is this model capable of using external tools? Yes, GPT-5.5 supports tool calling to assist with complex professional workflows.
- How much does GPT-5.5 cost? GPT-5.5 costs $5.00 per million input tokens and $30 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 18.2 credits ($1 = 100 credits).
- What is the context window of GPT-5.5? GPT-5.5 can read up to 1.1M tokens at once and write up to 128K tokens in one reply.
- Can I use GPT-5.5 without coding? Yes. In todo.is you pick GPT-5.5 as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.