OpenAI Introduces GPT-5.1: Combining Adaptive Reasoning, Account Level Personalization, And Updated Safety Metrics In The GPT-5 Stack

OpenAI has launched GPT-5.1 as the subsequent iteration within the GPT-5 household, with 2 core variants, GPT-5.1 Instant and GPT-5.1 Thinking. The replace focuses on 3 axes, adaptive reasoning conduct, clearer explanations, and stronger management over tone and security.

Model Lineup And Positioning

GPT-5.1 Instant is the default conversational mannequin in ChatGPT. OpenAI describes it as probably the most used mannequin, with a hotter default tone and improved instruction following. GPT-5.1 Thinking is the superior reasoning mannequin. It exposes specific pondering time and now adjusts that point extra exactly to the query. GPT-5.1 Auto continues to route queries between these variants so most finish customers don’t want to pick fashions manually.

GPT-5.1 Instant, Adaptive Reasoning For Everyday Use

GPT-5.1 Instant retains latency low for typical chat use whereas including adaptive reasoning. For easy prompts, the mannequin responds shortly with a shallow inside cross. For tougher prompts resembling multi step math or coding issues, it chooses to spend extra inside compute earlier than answering. This conduct yields greater scores on evaluations like AIME 2025 and Codeforces relative to earlier GPT-5 Instant variations, whereas staying responsive for informal use.

Instruction following is one other specific goal. In OpenAI’s examples, GPT-5.1 Instant is extra dependable on constraints resembling ‘all the time reply with 6 phrases’ and maintains that constraint throughout turns. This is related while you construct instruments that depend on strict codecs or quick pure language responses, for instance structured outputs, message templates, or chained instruments that anticipate bounded size.

The mixture of adaptive reasoning and stricter instruction adherence makes GPT-5.1 Instant a extra predictable entrance finish for a lot of agent workflows the place most calls are easy, however a tail of calls require deeper reasoning.

GPT-5.1 Thinking, Dynamic Compute Allocation

GPT-5.1 Thinking takes the GPT-5 Thinking strategy and tightens how pondering time is used. The mannequin now adapts its inside pondering time primarily based on immediate complexity. On a consultant distribution of ChatGPT duties with Standard pondering time, GPT-5.1 Thinking is roughly 2x sooner than GPT-5 Thinking on the quickest duties, and roughly 2x slower on the slowest duties.

This issues for workloads the place you need a single mannequin to deal with each mild and heavy queries. Lightweight queries don’t pay for lengthy chains of thought. Hard reasoning and planning duties obtain extra inside steps with none new API floor.

GPT-5.1 Thinking responses use much less jargon and fewer undefined phrases in comparison with GPT-5 Thinking. This reduces the time spent decoding verbose solutions and makes the mannequin extra appropriate as an interactive tutor on subjects resembling statistics, algorithms, or system design.

On the API, GPT-5.1 Instant is uncovered as gpt-5.1-chat-latest, and GPT-5.1 Thinking seems as gpt-5.1. Both embody adaptive reasoning by default.

Personalization, Preset Styles And Fine Grained Tone Control

Alongside the mannequin replace, ChatGPT will get a extra specific personalization layer. Users can select a base fashion resembling Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, or Cynical from a personalization display. These presets apply throughout all fashions, together with GPT-5.1.

OpenAI can also be experimenting with finer sliders in settings. Users can modify how concise, heat, or scannable responses must be, and the way typically emojis seem. ChatGPT can suggest updates to those preferences inside a dialog when it detects repeated tone requests. Preferences now apply instantly to each new and ongoing chats, which is a shift from earlier conduct the place modifications solely affected new conversations.

Safety Metrics And Preparedness Classification

The GPT-5.1 retains the identical total security framework as GPT-5 and gives up to date baseline metrics. GPT-5.1 Instant and GPT-5.1 Thinking use the identical class of mitigations described within the GPT-5 system card, together with filters for disallowed content material, routing for delicate instances, and coverage aligned refusals.

On the Production Benchmarks for disallowed content material, gpt-5.1-instant improves over gpt-5-instant in all listed classes. For instance, not_unsafe scores attain 0.918 for illicit or violent content material and 0.897 for hate content material.

For jailbreak robustness, measured with the StrongReject analysis, gpt-5.1-instant reaches a not_unsafe rating of 0.976 in comparison with 0.850 for gpt-5-instant and 0.683 for gpt-5-instant. gpt-5.1-thinking scores 0.967, which is near gpt-5-thinking at 0.974.

Key Takeaways

1. GPT-5.1 introduces 2 essential variants, GPT-5.1 Instant and GPT-5.1 Thinking, plus GPT-5.1 Auto as a router inside ChatGPT, and is positioned as an in technology improve inside the GPT-5 household, not a brand new mannequin technology.
2. GPT-5.1 Instant makes use of adaptive reasoning so it spends extra compute on arduous prompts and fewer on easy ones, which improves math and coding benchmarks resembling AIME 2025 and Codeforces whereas retaining low latency and stronger instruction following for typical chat workloads.
3. GPT-5.1 Thinking allocates dynamic pondering time per question, is round 2 occasions sooner than GPT-5 Thinking on simple duties and about 2 occasions slower on the toughest duties at Standard pondering, and produces clearer, much less jargon heavy explanations for technical questions.
4. ChatGPT provides a personalization layer on high of GPT-5.1 with preset types resembling Default, Professional, Friendly, Efficient, Nerdy and others, together with deliberate sliders for conciseness and heat, so tone management strikes partly from prompts into persistent consumer settings that apply throughout chats and fashions.
5. GPT-5.1 reuses the GPT-5 security framework and mitigations, improves gpt-5.1-instant security scores throughout all disallowed content material classes versus gpt-5-instant, considerably will increase jailbreak robustness on StrongReject, and retains preparedness assessments anchored within the GPT-5 system card for prime threat domains resembling organic and chemical capabilities.

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