The Arrival of GPT-5.5: OpenAI's New Deep-Thinking Powerhouse
Published on 28.04.2026
The Arrival of GPT-5.5: OpenAI's New Deep-Thinking Powerhouse
TLDR: OpenAI shipped GPT-5.5 and GPT-5.5 Pro, both available in the Kilo Gateway. The headline numbers are real, especially for terminal workflows and long-horizon coding, but the price went up and in-memory prompt caching is gone for this tier.
The Arrival of GPT-5.5: OpenAI's New Deep-Thinking Powerhouse
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