OpenAI Launches GPT-5.5: The Most Advanced AI Model with Agentic Coding & 1M Token Context

On April 24, 2026, OpenAI officially launched its most advanced AI model to date, GPT-5.5. The model delivers significant improvements in agentic coding, computer use, knowledge tasks, and early scientific research, positioning it as a critical step toward autonomous AI agents. GPT-5.5 is available immediately to ChatGPT Plus, Pro, Business, and Enterprise users via the ChatGPT interface and API, supporting a 1 million token context window.

On the pricing side, GPT-5.5 API costs $5 per million input tokens and $30 per million output tokens. OpenAI highlights efficiency gains, including lower token consumption at comparable latency, helping enterprises reduce key costs when scaling AI deployments. The model shows clear performance improvements in tasks related to math, science, finance, law, and research, further strengthening OpenAI’s enterprise-focused strategy.

Given that the release prioritizes paying Business and Enterprise users, OpenAI is accelerating its commercial monetization, with no mention of a free-tier plan yet. The breakthroughs in reasoning and autonomous capabilities in GPT-5.5 also lay the groundwork for future iterations closer to AGI (artificial general intelligence).