Quick brief: GPT-5.1 release
OpenAI announced the GPT-5.1 update on November 12, 2025, introducing two variants: GPT-5.1 Instant (fast, warmer responses) and GPT-5.1 Thinking (adaptive, deeper reasoning). The update expands ChatGPT personalization with new tone presets and will be rolled out across ChatGPT tiers and the API over the following days. Official details are available on OpenAI’s GPT-5.1 page. Microsoft also made GPT-5.1 available in parts of Copilot Studio for early testing; see Microsoft’s note here.
At a glance
2
Model variants: Instant, Thinking
8
Personality presets
API
GPT-5.1 available via API this week
3 months
Legacy GPT-5 stays in dropdown for paid users
Related site coverage: Tesla chip fab, Snap deal.
Try a tone preset (demo)
Sample prompt (fixed)
“Explain in two sentences: what is GPT-5.1 Thinking?”
GPT-5.1 Thinking adapts how much reasoning time it devotes to a prompt: it spends less time on simple tasks and more time for complex questions, and aims to reduce technical jargon in explanations.
Adaptive token usage — simplified view
This visualization is a simplified representation: token use is lower on short tasks and expands for very complex tasks, with GPT-5.1 Thinking allocating more tokens for complex reasoning while staying efficient on simpler prompts.
Rollout timeline (high level)
Nov 12, 2025
OpenAI published the GPT-5.1 announcement and system-card addendum. See the official post: openai.com.
Week of rollout
GPT-5.1 Instant and Thinking are rolled out across ChatGPT tiers; API endpoints are planned to be added the same week.
Legacy access
GPT-5 remained available as a legacy option in ChatGPT for a temporary period to allow comparison.
Speed ↔ Thoroughness selector
Model
Speed
Thoroughness
Tip: GPT-5.1 Thinking will move itself toward higher thoroughness automatically on complex prompts; Instant emphasizes speed while improving instruction following.
Quick facts & resources
Official OpenAI release ▸
OpenAI announcement: openai.com — GPT-5.1
Microsoft Copilot Studio note ▸
Microsoft’s availability note: Copilot Studio — GPT-5.1
Related site links ▸
Conclusion
The section summarized the GPT-5.1 announcement: the two model variants (Instant and Thinking), expanded personalization presets, phased rollout across ChatGPT tiers and the API, and the availability note for Microsoft Copilot Studio. For the official product details, see OpenAI — GPT-5.1.