OpenAI launches GPT-5.1 with improved accuracy and personalization

The release is already available to paid users and will soon roll out to everyone.

Key Updates for Business and Marketing Teams

GPT-5.1 Instant: Warmer Tone and More Accurate Responses

ChatGPT’s most frequently used model now offers:

• a more natural, human-like communication style;
• significantly improved instruction following;
• adaptive reasoning — the model decides when to “think longer” to deliver more complete answers.

For B2B teams, this means less prompt rewriting and faster, more structured outputs.

GPT-5.1 Thinking: Faster and Deeper Analytical Reasoning

The advanced reasoning model for complex analytical tasks has become:

• twice as fast for simple queries;
• more deliberate for complex cases (analytics, technical explanations, handling large datasets);
• easier to understand — with less jargon and fewer abstract formulations.

This is particularly useful for marketers working with multi-layered analytics, complex calculations, or explaining technical changes to clients.

Personalization: New Presets and More Predictable Model Behavior

OpenAI updated its tone presets: Default, Friendly, Efficient, and added Professional, Candid, Quirky.

Importantly, tone and behavior settings now apply across all chats — not only new ones. Models follow custom instructions more consistently, improving stability in long-term projects.

The company is also testing adjustable “sliders” for fine-tuning:

• conciseness,
• warmth,
• structural clarity,
• emoji frequency.

This gives marketers the ability to quickly adapt the model’s writing style to a brand’s tone of voice.

Rollout and Transition Period

GPT-5.1 Instant and Thinking are already available to paid users. Over the next week, enterprise customers will have the option to enable early access; afterward, the model will become the default.

GPT-5 will remain available for the next three months for comparison.

Why This Matters for Marketers

GPT-5.1 is designed to improve productivity for teams working with large volumes of content, data, and client communications. The updates directly influence the quality and speed of marketing operations.

Fewer Hallucinations and More Accurate Instruction Following

Marketers rely on stable, predictable, and factually correct outputs. GPT-5.1 reduces the risks of:

• incorrect insights in reports and presentations;
• misinterpretation of technical metrics (CPC, ROAS, attribution, etc.);
• deviation from briefs in content creation.

This means fewer corrections, less time spent clarifying queries, and fewer risks in client-facing work.

Adaptive Reasoning: Speed for Simple Tasks, Depth for Complex Ones

The new reasoning system ensures fast responses to routine tasks (content generation, structuring materials, translations) while allocating more “intellectual bandwidth” to complex work:

• competitor analysis;
• interpreting GA4, CRM, or ad platform data;
• forming hypotheses for experiments;
• building strategic recommendations.

In essence, the model has become more flexible: it doesn’t overthink simple tasks but “goes deep” when needed.

More Accurate Tone-of-Voice — Essential for Brands and B2B Communication

GPT-5.1 better understands tone, which simplifies:

• writing content in a brand’s tone of voice;
• adapting communications for different audience segments;
• agency workflows where one brand = multiple styles (official, expert, simplified for social media).

The new presets and improved instruction adherence deliver a consistently “on-brand” style, reducing revision cycles.

Clearer Explanation of Technical Topics

GPT-5.1 uses fewer abstractions and less technical jargon, making it easier to:

• explain complex advertising technologies to clients (auctions, optimization algorithms, attribution);
• adapt technical documentation for internal teams;
• create training materials for colleagues;
• build presentations for leadership where clarity is essential.

The model is now a more effective bridge between marketing, technical teams, and decision-makers.

Conclusion

GPT-5.1 is a step toward a more personalized and professional AI tool. It evolves from a simple assistant into an adaptive partner capable of supporting complex analytical and content-driven workflows in marketing.

Read this article in Ukrainian.