GPT-5.1

GPT-5.1
GPT-5.1
Developer	OpenAI
Initial release	November 12, 2025; 17 days ago
Included with	ChatGPT; Microsoft Copilot;
Predecessor	GPT-5
Type	Multimodal; Large language model; Generative pre-trained transformer; Foundation model;
License	Proprietary
Website	openai.com/index/gpt-5-1/

GPT-5.1 is a large language model within OpenAI's GPT series, released on November 12, 2025.^[1] It expanded beyond text with shopping research, multimodal features, and customizable personalities. Its interactive shopping tools highlight OpenAI's drive toward everyday usefulness.^[2]

GPT-5.1 offers 8 personality options, making it OpenAI's most customizable model yet.^[3]^[4] According to OpenAI, it is faster and has a "warmer personality" by default compared to GPT-5.^[1]^[5]

The model consists of two modes: GPT-5.1 Instant and GPT-5.1 Thinking, the latter being a reasoning model designed for more complex tasks.^[6]

GPT-5.1 is available to all users, though paid Pro, Plus, Go, and Business users were given advanced access.^[7] From GPT-5.1's release, the old GPT‑5 model will remain available as a legacy option for three months to give users time to transition.^[7]

On November 19, 2025, OpenAI released GPT‑5.1-Codex-Max, an agentic coding model which "has been internally observed to complete tasks lasting more than 24 hours, including multi-step refactors, test-driven iteration, and autonomous debugging."^[8] GPT-5.1 Pro was also released on the same day, replacing GPT-5 Pro.^[9]

Reception

Critical reviews

Amanda Caswell from Tom's Guide praised GPT-5.1 for its mathematical reasoning and coding abilities, but ultimately decided that Gemini 3 produced better results overall.^[10]

Writing for TechRadar, Eric Hal Schwartz compared GPT-5.1 to GPT-5 and found the new model to be more consistent in following prompts. Though the upgrade "might be termed [an] incremental improvement" and despite GPT-5 being "still a remarkably capable model that delivers strong performance across a variety of tasks", "GPT-5.1 builds on that foundation with refinements that make it feel like a better choice for real-world uses."^[11]

User responses

In several surveys, many^[quantify] users have been found to feel that while GPT-5.1 Thinking is an improvement, GPT-5.1 Instant is a significant decrease in understanding and accuracy from GPT-5 Mini and also easier to convince to produce NSFW content.^{[citation needed]}

References

^ ^a ^b "OpenAI says the brand-new GPT-5.1 is 'warmer' and has more 'personality' options". The Verge. November 13, 2025.
^ "openai-launches-chatgpt-5-1-with-8-new-personalities-warmer-tone-and-quicker-replies". November 12, 2025.
^ Hughes, Alex (November 13, 2025). "ChatGPT-5.1 offers 8 different personalities to choose from — here's how to use them". Tom's Guide. Retrieved November 13, 2025.
^ Mannan, Jasmine (November 13, 2025). "I love Gemini, but the GPT 5.1 update could make ChatGPT the AI bot you want to use". Digital Trends. Retrieved November 13, 2025.
^ "OpenAI's GPT-5.1 makes ChatGPT 'warmer' and smarter - how its upgraded modes work now". ZDNET. Retrieved November 13, 2025.
^ Edwards, Benj (November 12, 2025). "OpenAI walks a tricky tightrope with GPT-5.1's eight new personalities". Ars Technica. Retrieved November 14, 2025.
^ ^a ^b Schäfer, Michael (November 13, 2025). "OpenAI GPT 5.1: KI wird nicht nur intelligenter, sondern auch freundlicher". ComputerBase [de] (in German). Retrieved November 19, 2025.
^ Franzen, Carl (November 19, 2025). "OpenAI debuts GPT‑5.1-Codex-Max coding model and it already completed a 24-hour task internally". VentureBeat. Retrieved November 22, 2025.
^ "ChatGPT — Release Notes". OpenAI. Retrieved November 25, 2025. GPT-5.1 Pro: Clearer, more capable answers for complex work
^ Caswell, Amanda (November 19, 2025). "I just tested Gemini 3 vs ChatGPT-5.1 — and one AI crushed the competition". Tom's Guide. Retrieved November 19, 2025.
^ Schwartz, Eric Hal (November 14, 2025). "I compared GPT-5.1 to GPT-5 on ChatGPT, and now I don't want to go back". TechRadar. Retrieved November 19, 2025.

External links

Official website
GPT-5.1 Prompting Guide. OpenAI. November 13, 2025.
GPT‑5.1 in Foundry: A Workhorse for Reasoning, Coding, and Chat. Microsoft Foundry Blog. November 13, 2025.
Building more with GPT-5.1-Codex-Max. OpenAI. November 19, 2025.

[:1-1] "OpenAI says the brand-new GPT-5.1 is 'warmer' and has more 'personality' options". The Verge. November 13, 2025.

[2] "openai-launches-chatgpt-5-1-with-8-new-personalities-warmer-tone-and-quicker-replies". November 12, 2025.

[3] Hughes, Alex (November 13, 2025). "ChatGPT-5.1 offers 8 different personalities to choose from — here's how to use them". Tom's Guide. Retrieved November 13, 2025.

[:0-4] Mannan, Jasmine (November 13, 2025). "I love Gemini, but the GPT 5.1 update could make ChatGPT the AI bot you want to use". Digital Trends. Retrieved November 13, 2025.

[5] "OpenAI's GPT-5.1 makes ChatGPT 'warmer' and smarter - how its upgraded modes work now". ZDNET. Retrieved November 13, 2025.

[6] Edwards, Benj (November 12, 2025). "OpenAI walks a tricky tightrope with GPT-5.1's eight new personalities". Ars Technica. Retrieved November 14, 2025.

[:2-7] Schäfer, Michael (November 13, 2025). "OpenAI GPT 5.1: KI wird nicht nur intelligenter, sondern auch freundlicher". ComputerBase [de] (in German). Retrieved November 19, 2025.

[8] Franzen, Carl (November 19, 2025). "OpenAI debuts GPT‑5.1-Codex-Max coding model and it already completed a 24-hour task internally". VentureBeat. Retrieved November 22, 2025.

[9] "ChatGPT — Release Notes". OpenAI. Retrieved November 25, 2025. GPT-5.1 Pro: Clearer, more capable answers for complex work

[10] Caswell, Amanda (November 19, 2025). "I just tested Gemini 3 vs ChatGPT-5.1 — and one AI crushed the competition". Tom's Guide. Retrieved November 19, 2025.

[11] Schwartz, Eric Hal (November 14, 2025). "I compared GPT-5.1 to GPT-5 on ChatGPT, and now I don't want to go back". TechRadar. Retrieved November 19, 2025.

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