GPT-5.1

GPT-5.1
DeveloperOpenAI
ReleaseNovember 12, 2025 (2025-11-12)
Included with
PredecessorGPT-5
SuccessorGPT-5.2
Type
LicenseProprietary
Websiteopenai.com/index/gpt-5-1/

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

Features

GPT-5.1 adds customizable personalities, with 8 personality options.[2][3] OpenAI describes it as having a "warmer personality" by default compared to GPT-5.[1]

GPT-5.1 is available to all users, though paid Pro, Plus, Go, and Business users were given advanced access.[4]

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.[5] GPT-5.1-Codex-Mini was released on the same day as a cost-effective alternative for coding and agentic tasks.

On November 19, 2025, OpenAI released GPT‑5.1-Codex-Max, an agentic coding model.[6] GPT-5.1 Pro was also released on the same day, replacing GPT-5 Pro.[7]

Reception

Critical reviews

Amanda Caswell from Tom's Guide praised GPT-5.1 for its mathematical reasoning and coding abilities, but decided that Gemini 3 produced better results overall.[8]

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. He also considered it an "incremental improvement".[9]

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. ↑ 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.
  3. ↑ 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.
  4. ↑ Schäfer, Michael (November 13, 2025). "OpenAI GPT 5.1: KI wird nicht nur intelligenter, sondern auch freundlicher". ComputerBase (in German). Retrieved November 19, 2025.
  5. ↑ Edwards, Benj (November 12, 2025). "OpenAI walks a tricky tightrope with GPT-5.1's eight new personalities". Ars Technica. Retrieved November 14, 2025.
  6. ↑ 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.
  7. ↑ "ChatGPT — Release Notes". OpenAI. Retrieved November 25, 2025. GPT-5.1 Pro: Clearer, more capable answers for complex work
  8. ↑ 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.
  9. ↑ 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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