OpenAI Releases GPT-5.5, Its Most Capable AI Model Yet
OpenAI has announced GPT-5.5, describing it as "the most capable and easiest to use model yet, and the next step toward a new way of getting work done on a computer."
Key Capabilities
GPT-5.5 excels at:
- Writing and debugging code
- Researching online
- Analyzing data
- Creating documents and spreadsheets
- Operating software
- Moving across tools until a task is finished (true agentic behavior)
According to OpenAI, "gains are especially strong in agentic coding, computer use, knowledge work, and early scientific research—areas where progress depends on reasoning across context and taking action over time."
Efficiency Improvements
The company has focused on making GPT-5.5 more token-efficient than its predecessor:
"carefully tuning the experience so GPT‑5.5 delivers better results with fewer tokens than GPT‑5.4 for most users"
The model matches GPT-5.4's per-token latency while performing at a much higher level of intelligence.
Availability and Pricing
GPT-5.5 is rolling out to Plus, Pro, Business, and Enterprise users in ChatGPT and Codex starting April 23, 2026. A more powerful GPT-5.5 Pro version is available to Pro, Business, and Enterprise users.
The model is also available in the API as of April 24, 2026. While priced higher than GPT-5.4, OpenAI justifies this based on intelligence and efficiency gains.
Safety Measures
OpenAI is "releasing GPT‑5.5 with their strongest set of safeguards to date," designed to reduce misuse while preserving access for beneficial work. The company worked with internal and external redteamers and added targeted testing for advanced cybersecurity and biology capabilities.
Market Context
This release comes as OpenAI faces increased competition from Google's Gemini and Anthropic's Claude. According to reporting, OpenAI "fell short of internal user and revenue goals as it moved toward an IPO path."
The company has also "widened its cloud reach after loosening a previous Microsoft-linked exclusivity structure, opening the door for distribution through Amazon and also room for ties with Google."