On November 12, 2025, OpenAI announced that its newest model, GPT-5.1, has been &# 12522;leased the GPT-5 (announced in August 2025)&# 12398; As the next version, it will offer warmer&#. 12415;warmer conversations, faster response times, and| 38283;s new features for callersす. 12377; This article describes the new features of GPT-5.1, the Benチmark and other new features. This article details the new features of GPT-5.1, its benチmark and how it compares to other models. 12367; This article will explain in detailくwhat's new in GPT-5.1, its benチmark and how it compares to other models.
Two Model Variants of GPT-5.1
GPT-5.1 offers two variants for different applications. 12488; are available for different applications.
| Model | Characteristics | Optimal Applications |
|---|---|---|
| GPT-5.1 Instant | Warm conversation, low latency | Routine questions, customer support |
| GPT-5.1 Thinking | Deep reasoning, strong for complex tasks | Math, coding, analysis |
GPT-5.1 Instant
The most used default modӤ in ChatGPT 12523; Key features:
- Warm and friendly conversation: template-likeӤ 12394; natural conversational tone rather than template-like responses
- Adaptive Reasoning: Automatically adjusts the time to think, depending on the complexity of the task. 12390; Automatic adjustment of thinking time
- Improved fidelity to instructions: constraints such as "in 6 words or less回 Respond accurately to constraints such as "6 words or less".
GPT-5.1 Thinking
Advanced reasoning specialized for complex tasks⾹s 12514;Del:
- About twice as fast as conventional for simple tasks
- Twice as long for complex tasksて Deeper reasoning
- Easier-to-understand explanations and more persistentԁ problem solving 21839; Problem-solving ability
OpenAI official: GPT-5.1 announced
Adaptive Reasoning
The most important feature of GPT-5.1 is "Adaptive Reasoning". The most important feature of GPT-5.1 is "Adaptive Reasoning", which determines how much "考 can be done" depending on the complexity of the task. 32771; dynamically adjusts how much itスs able to "get" depending on the complexity of the task.
How it works
- Simple task: immediate answer in "no reasoning" mode (within 2 seconds) Simple task: immediate answer in "no reasoning" mode (within 2 seconds)
- Complex task: Deep thinking process 32076; and answer it.
Example
A "globally installed by npmた Tell me what packages are listed in the npm package list. GPT-5: Took 10 seconds to answer:
- GPT-5: 10 seconds to answer.
- GPT-5.1: answered in 2 seconds
This reduces the token consumptionド and the response time. 12392 ; while improving response timeと. 12290;
Personalization Controls
Users can customize the tone of the response. Available pre-setsイ: Personalization Controls Available presetsト:
| Preset | Description |
|---|---|
| Default | Balanced standard response |
| Friendly | Friendly and warm response |
| Professional | Formal, business-oriented response |
| Candid | Straightforward and direct responses |
| Nerdy | Responses that include technical details |
| Quirky | Unique and personalized response |
| Efficient | Responses that are concise and to the point |
| Cynical | Responses from a skeptical perspective |
In addition, experimental control of "warmth" and "conciseness（ Experimental control of "warmth" and "concisenessル ;has also been added.
New features for developers
Important new features for developersがhave been added to the GPT-5.1 API. The GPT-5.1 API includes the following new features for developers
apply_patch tool
Aӗnew tool for more reliableӗeditingӗofӗcode. 12398;This is a new tool that allows you toはreplaceはthe traditional full-text replaceはtool with a new one. 12399;Instead of the traditional full-text replacement, you can now modify the codeドin a patch format. 12489; in a patch format instead of full text replacement.
Shell Tool
The shell tool allows models to directly execute shell commands. It is a function that allows models to execute shell commands directly. 12527;s in the agent type.
Extended prompt cache
The cache retention time has been extended to a maximum of 24 hours. This allows for faster延response延to repetitive requests:
- Faster response to repetitive requests. 21270; and
- Reduction of API usage cost
OpenAI Official: GPT-5.1 for Developers
GPT-5.1 Codex Series
Coding-specific models are also available in the same&# 26178; release. 26178; released in the same昺 time.
| Model | Features | Purpose of use |
|---|---|---|
| GPT-5.1-Codex | Long-time agent-type codin&# 12464; for | Large projects, complex tasks |
| GPT-5.1-Codex-Mini | Lightweight version, fast response | Quick editing, code completion |
For use with GitHub Copilot
GitHub Copilot Pro, Pro+, Business and Enterprise users can use the following &# 12398; environment. 65306;
- VS Code (1.104.1 or higher): chat, ask, edit, agent mode
- JetBrains (1.5.61 or higher): ask, edit, agent mode
- Xcode (0.45.0 or later): ask, edit, agent mode
- Eclipse (0.13.0 or higher): ask, edit, agent mode
GitHub Copilot: GPT-5.1 compliant
Benchmark Performance
GPT-5.1 is a further performance improvement over GPT-5い. 12356; and is now available for download from the GPT-5 website.
Official Benchmarks
| Benchmarks | GPT-5 | GPT-5.1 |
|---|---|---|
| AIME 2025 (math) | 94.6% (math) | Equal to slightly improved |
| SWE-bench Verified (coding) | 74.9% Improvement | Improvement |
| Aider Polyglot | 88% Improvement | Improvement |
| Codeforces | -Aider Polyglot | Improvement |
Operational Performance
According to a report by asset management firm Balyasny Asset Managementる and 12427; and:
GPT-5.1 outperformed both GPT-4.1 and GPT-5 in our完 GPT-5.1 outperforms both GPT-4.1 and GPT-5 in our完full dynamic evaluation suite. 12398;ran two to three times faster."
Actual Measurements on Coding Tasks
Agent-based coding taskでs 12391; comparison (Composio study):
- Anomaly detection system construction
- GPT-5.1 Codex: 11 minutes, $0.76
- GPT-5: 18 minutes, $0.95
- Claude 4.5 Sonnet: $1.68 (buggy)
GPT-5.1 Codex costs about 55% less than Claude 4.5 Sonnet , or &#. 12388;It generates code that works in a production environment. 12375;.
Composio: Agent-based Coding Ratio較. 36611; Comparison with GPT-5
Comparison with GPT-5
GPT-5.1 is not a "dramatic IQ improvement," but rather a better usabilityい GPT-5.1 focuses on ease of use and agent-based workoffロs optimization, not "dramatic IQ improvement". GPT-5.1 focuses on usability and agent-based workflow optimization, not "dramatic IQ improvement ".
| Item | GPT-5 | GPT-5.1 |
|---|---|---|
| Response Speed | Standard | 2 to 3 times faster (simple tasks) |
| Conversation Tone | Standard | Warmer |
| Token efficiency | Standard | Significantly improved |
| Developer Tools | Standard | apply_patch, shell addition |
| Personalization | Limited | 8 presets + advanced settings |
GPT-5.1 Review: 7 Important Upgrades&#. 12540; Do's and Don'ts
Comparison with Claude 4.5 Sonnet
In comparison to Anthropic's Claude 4.5 Sonnet, eachԁ 24375;s are different.
| Item | GPT-5.1 | Claude 4.5 Sonnet |
|---|---|---|
| Strengths | Speed, cost efficiency | Agent reliability, tool use |
| Coding | Fast, low cost | Quality oriented |
| Optimization targets | Product ergonomics, developer experience | Sustainable tool use |
It is important to use the right tool for the right purposeで. 12391; It is important to use the right tool for the right purpose.
Thorough Comparison of ChatGPT, Claude, and Gemini｜Recommendationsめby Use AI Selection Guide
Rates and Available Plans
Use with ChatGPT
- Pro: $200/month - full functionality
- Plus: $20/month - GPT-5.1 available
- Go: New plan - GPT-5.1 available
- Business: for teams - GPT-5.1 available
- Free: Available in phases
Use with API
For detailed pricing, please visit OpenAI's official websiteき. 12365; GPT-5.1 offers a significant improvement in talkンefficiency compared to GPT-5. GPT-5.1 is significantly more efficient than GPT-5, which means that you can実 The cost reduction is expected to be qualitative.
Continued use of GPT-5
GPT-5 is a legacyモserviceモfor paying users. 12514; available as a del for 3 months.
Effective Prompt Writing
To get the most out of GPT-5.1プs capabilities 12503; Here are some prompting techniquesプ to get the most out of GPT-5.1. 12290;
1. clarify constraints
GPT-5.1 has improved fidelity to instructions. 12377;:
Answer in 6 words or less: Explain the un来 of AI. Describe the following2. specify the tone
Utilize the personalization feature：. 65306;.
Please use a professional tone toԁ improve thisԁ business proposal. 12398; Improve your business proposal. 12356; 3.3. take complex tasks in stages
GPT-5.1 Thinking to help you:
Solve the following problems step by step. 12356; Explain your thinking process at each step. 26126; Explain your thinking process at each step.How to write an AI prompt 7 techniques to maximize the effect
Summary
GPT-5.1 is a more user-friendly and efficient version of the "smarts" of GPT-5. 12377; and more efficient. 12377; and more efficient.
Main Points
- Two variants: Instant (for everyday use) and Thinking 65288; for complex tasks.)
- Adaptive Reasoning: optimal thinking for each task時 Adaptive Reasoning
- 2-3x faster: on simple tasks応 Improved answer speed
- Token efficiency improvement: direct結cost reduction 32080; New tool for developers: a
- New tools for developers: apply_patch, shell, 24 hours間 Cache
- GPT-5.1 Codex: agent-based coding&# 12395; Optimization
Recommended usage
- Routine questions: GPT-5.1 Instant
- Complex analysis and reasoning: GPT-5.1 Thinking
- Coding: GPT-5.1 Codex (via GitHub Copilot)
GPT-5.1 is a fast, cost-effective &# 12426; and further accelerate the use of AI in business. 12373; model, especially for agencyӔ-type workflows. 12488;s workflows and coding tools. 12473;s, especially in agencyト-type workflows and coding tools. 12391; In addition, the model is also a great tool for the development of new applications.
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