GPT-5.5 Pro
GPT-5.5 Pro is an OpenAI model designed for complex, high-stakes tasks that require deep reasoning. It supports a large context window of over one million tokens and can process text, images, and files.
GPT-5.5 Pro 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: $30 input / $180 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What GPT-5.5 Pro is good at
- Analyzing extensive document sets
- Complex logical reasoning tasks
- Processing multi-modal inputs like images and files
To-dos to try with GPT-5.5 Pro
- Upload a 500-page technical manual and summarize the troubleshooting steps for a specific error code.
- Analyze a set of project images and files to identify inconsistencies in a design plan.
- Use the reasoning capability to evaluate the logical consistency of a long-form research proposal.
FAQ
- Who developed GPT-5.5 Pro? This model was developed by OpenAI.
- Can this model process images? Yes, GPT-5.5 Pro supports both image and file inputs alongside text.
- How much does GPT-5.5 Pro cost? GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 109.2 credits ($1 = 100 credits).
- What is the context window of GPT-5.5 Pro? GPT-5.5 Pro can read up to 1.1M tokens at once and write up to 128K tokens in one reply.
- Can I use GPT-5.5 Pro without coding? Yes. In todo.is you pick GPT-5.5 Pro 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.