- Two variants: GPT-5.1 Instant and GPT-5.1 Thinking with adaptive reasoning and clearer answers.
- New tone and personality controls (friendly, efficient, sincere, quirky, and professional) and granular adjustments.
- Gradual rollout: first paid plans; availability in API with gpt-5.1-chat-latest and GPT-5.1.
- GPT-5 remains as a legacy for three months; direct impact on companies in Spain and the EU.
OpenAI has enabled GPT-5.1 in ChatGPT With an update focused on improving the clarity of responses, instruction tracking, and conversational tone. It arrives in two variants —Instant y Thinking— with the aim of better adapt to the type of consultation without forcing the user to change tools.
In addition to the new models, options are arriving for choosing personality and fine-tuning style. deployment is gradual and prioritizes those with a paid subscription, with later availability for free accounts; in Europe and Spain, these new features are aligned with more explicit memory and preference controls for to promote business integration.
What is ChatGPT 5.1 and what changes?
GPT-5.1 It is an evolution on GPT-5 which reinforces the reasoning, It reduces technical jargon and makes the dialogue more natural.OpenAI emphasizes a focus on warmer interactionsMaintaining accuracy and usefulness in daily and professional tasks.
Among the notable improvements is the adaptive reasoningAI can dedicate more or less "thinking time" depending on the complexity, offering Quick responses when the basics are sufficient, and expanding the analysis when the challenge requires it..
Instant and Thinking: this is how tasks are divided
The variant GPT-5.1 Instant It is designed for most everyday uses. faster, It's best to follow the instructions. y adopts a more approachable tone, with the ability to "stop and think" when the question requires it.
Version GPT-5.1 Thinking Prioritize advanced reasoning. Adjust effort according to the problem. It speeds up for simple requests and extends when it's necessary to break down logical steps., promising clearer answers with less technical jargon.
- Instant: speed and naturalness for general inquiries, with adaptive reasoning when the difficulty increases.
- Thinking: analytical depth and better handling of complex tasks with clearer explanations.
More personality and control of style
ChatGPT adds personality profiles to choose between default behavior and alternatives such as friendly, efficient, sincere, peculiar, or professionalThe technical capabilities of the model do not change, but the way in which they are expressed does.
OpenAI is also testing granular controls that allow for fine-tuning conciseness, warmth, or use of emojis, applying immediately even to chats that are already open. The memory can be turned on or off.offering greater control over what the assistant remembers and how it affects tone.
Transition from GPT-5 and compatibility
To avoid friction, GPT-5 It will remain available for three months. in the paid subscriber model selector. Earlier versions like GPT-4o could be maintained for longerso that companies can validate prompts and automations before the final change.
The practical recommendation is to review prompts that are sensitive to the style or structure of the response, especially in branded content generators, support assistants, and tools that manage regulated information.
Impact on companies and sectors in Spain
The deployment of GPT-5.1 It's staggered: it will first reach subscribers of Pro, Plus, Go and Business, plus Enterprise and Eduand later to free users. This prioritization aims to ensure an orderly transition and minimize sudden changes in productive environments.
In customer service, support, and internal communications, personality control and clarity of response help to adopt a tone more aligned with the brandThis facilitates deployments in banking, insurance, energy, or healthcare, where consistency and readability are key.
- Automation chats and forms with clearer responses and less jargon.
- Internal Assistants for documentation, analysis, and training with configurable style.
- that take advantage of lower latency and adaptive reasoning.
- Multilingual and tone adjustment for diverse audiences in Spain and the EU.
User safety and well-being
The balance between warmth and precision—along with user-controlled memory—aims to make the interaction useful. without fostering unhealthy dependencies or misunderstandings on sensitive issues.
Everything points to GPT-5.1 consolidates a more adaptable approachTwo variants to cover everything from the immediate to the complex, greater control over tone, and a monitored transition with legacy models. For organizations in Spain and the EU, the key will be validating real-world use cases, adapting the style to each channel, and measuring the impact on costs, quality, and response times.
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