GPT-5.5

GPT-5.5 (April 2026) is OpenAI's flagship — best-in-class agentic coding, frontier reasoning and a ~1M-token context, powering the top of ChatGPT and the API.

Best for

• Hardest agentic coding and long-horizon software engineering
• Frontier research, science and competition-grade math
• Whole-repo / multi-document analysis (huge context)
• When you want the single strongest OpenAI model

How it compares — and the India angle

• At $5/$30 per 1M tokens it's ~2x the price of GPT-5.4 for a modest quality gain — for most production work GPT-5.4 is the smarter value pick.
• Indian devs/startups: reserve GPT-5.5 for the hardest jobs and route bulk traffic to a mini tier; the INR price gap compounds fast at volume.
• Feeding it giant contexts (>272K tokens) silently ~doubles the bill — chunk or summarise first unless you truly need the full window.