OpenAI
APIs and tools for building AI products
5.0•741 reviews•14K followers
APIs and tools for building AI products
5.0•741 reviews•14K followers
The most powerful platform for building AI products.
Build and scale AI experiences powered by industry-leading models and tools.
This is the 39th launch from OpenAI. View more
GPT‑5.5 Instant
Launching today
GPT-5.5 Instant replaces GPT-5.3 as ChatGPT's default model with smarter, more concise answers, improved personalization from past chats and connected Gmail, and memory source controls.
For ChatGPT users on all plans.
Free
Launch Team
Claude Code
Gemini 2.5 Pro
GPT-5.5 Instant is now ChatGPT’s default model, replacing GPT-5.3 Instant globally.
It brings two major upgrades.
First, accuracy: hallucinated claims on sensitive medical, legal, and financial prompts dropped by 52.5% versus the previous default.
Second, a new transparency feature called memory sources. When ChatGPT personalizes responses using past chats, saved memories, files, or connected Gmail, it now shows exactly what context it referenced. Users can review, edit, or delete those sources.
Most AI personalization works like a black box. Memory sources changes that by adding a citation-like layer for personal context across all ChatGPT models, not just GPT-5.5 Instant.
Key features:
52.5% fewer hallucinated claims on high-stakes prompts
Memory sources with visible, editable context references
Personalization from chats, files, and Gmail
More concise responses by default
Better visual reasoning, STEM, math, and web search decisions
Available in API as chat-latest
Why it matters:
More reliable answers where accuracy matters most
Greater transparency and control over personalization
Less response bloat in everyday use
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