GPT-5.1

Last updated

GPT-5.1
Developer OpenAI
Initial releaseNovember 12, 2025;31 days ago (2025-11-12)
Included with
Predecessor GPT-5
SuccessorGPT-5.2
Type
License Proprietary
Website openai.com/index/gpt-5-1/

GPT-5.1 is a family of four large language models within OpenAI's GPT series. Two were released on November 12, 2025; [1] two more were released one week later on November 19.

Contents

Features

GPT-5.1 expands beyond text with shopping research, multimodal features, and customizable personalities. Its interactive shopping tools highlight OpenAI's drive toward everyday usefulness. [2] It offers 8 personality options, making it OpenAI's most customizable model yet. [3] [4] It is also faster and has a "warmer personality" by default compared to GPT-5. [1] [5]

GPT-5.1 is available to all users, though paid Pro, Plus, Go, and Business users were given advanced access. [6] 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. [6]

Models

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. [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]

References

  1. 1 2 "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.
  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. 1 2 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.
  7. ↑ Edwards, Benj (November 12, 2025). "OpenAI walks a tricky tightrope with GPT-5.1's eight new personalities". Ars Technica. Retrieved November 14, 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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