OpenAI has officially released GPT 5.1, an upgraded version of its GPT-5 series that brings enhanced reasoning, more natural tone, and improved customization. The rollout begins today for all ChatGPT users — starting with paid tiers and expanding from there. Learn more on OpenAI’s site
What’s new in GPT 5.1?
- Instant mode: ChatGPT’s most-used model is now warmer, more conversational, and better at following your instructions.
- Thinking mode: Optimised for deeper reasoning and complex tasks — it adapts its “thinking time”, making quick tasks faster and tough tasks more thorough.
- Personalisation upgrades: You can now choose from improved tone presets (Friendly, Professional, Quirky, Efficient, etc.) and tailor how the assistant responds.
Why this matters
For professionals who leverage ChatGPT for planning, drafting, analysis or collaboration, GPT 5.1 brings two big advances: smarter outputs and a voice that feels more like *you*. It’s no longer just about *what* the AI can do but *how* it does it. Customers are already reporting smoother conversations and better alignment with their workflows.
Rollout & availability
- GPT 5.1 is rolling out now; paid users will likely see it first, followed by broader access.
- If you don’t see it yet in ChatGPT, give it a little time — the rollout is progressive.
Whether you’re brainstorming, generating proposals, managing projects or writing content, now is a great moment to test GPT 5.1 and explore the new modes and tone settings. If you’ve already got access, experiment with *Instant* vs *Thinking* and try adjusting the assistant’s “personality” to match your style.
Note: As with any upgrade, results may vary depending on your use-case and prompt style. The best way to learn is by diving in and seeing how the new model changes your experience.