What's changed (as of 2026-09-11)
- Frontend name/tagline no longer say GPT-4.
- Model list updated to GPT-5.6 Sol / Terra / Luna and GPT-6 Pro.
- GPT-4o noted as retired from ChatGPT (still may exist on API).
Evidence: https://openai.com/index/gpt-5-6/ · https://help.openai.com/en/articles/20001051-retiring-gpt-4o-and-other-chatgpt-models
Why it matters
- Widely used for drafting, explanation, and coding help.
- Supports file uploads and tool use in-session.
- Same model family available via OpenAI API for integration.
Key capabilities
- Multi-turn chat with context retention.
- Code generation and explanation.
- Optional browsing and advanced tools (subscription).
Technical notes
- API: Separate product (OpenAI API); chat is web/apps.
- Self-hosted: No.
- License: Proprietary.
- Current models: GPT-5.6 family — not GPT-4.
Ideal for
- Everyday assistant use, coding help, and writing.
- Teams on Plus / Business / Enterprise plans.
Not ideal for
- Privacy-sensitive workloads that cannot leave your network.
- Pure API integration (use OpenAI API).
See also
- OpenAI GPT — Model-family notes (GPT-5.6 vs retired GPT-4).
- OpenAI API — Programmatic access.
- Claude — Anthropic alternative.