GPT-5.1 Pro

GPT-5.1 Pro

OpenAI
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About

GPT-5.1 Pro is the highest-performance version of the GPT-5.1 model family, designed for research-grade reasoning and advanced analytical workloads. It delivers deeper, more structured thinking, making it ideal for complex problem-solving across coding, science, finance, law, and technical research. Unlike the Instant and Thinking versions, GPT-5.1 Pro is built to maintain accuracy under heavy cognitive load, producing clearer logic and more reliable multi-step reasoning. Pro users also gain access to extended context windows, allowing significantly longer inputs and deeper information processing. While it supports the full range of ChatGPT features, GPT-5.1 Pro is optimized for precision, rigor, and high-stakes tasks. It is available exclusively to ChatGPT Pro and Business customers.

About

Step 5 Preview is StepFun’s flagship model for agentic work, designed for real-world tasks across software engineering and professional knowledge work, with particular strength in finance. It natively supports text, image, and video input and provides a 1M-token context window, enabling tasks that require large amounts of information, tool calls, and continuous progress toward a deliverable. The model can analyze long documents, multiple source materials, and conversation history for cross-document question answering and research organization. For programming and software engineering, it works across multiple languages and can support troubleshooting, code changes, verification, and test creation. Its multi-step agent capabilities let applications provide tools for retrieving information, processing documents, conducting deep research, and producing analytical reports. Multimodal understanding combines images, video, and text for chart analysis, screenshot question answering, etc.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

GPT-5.1 Pro is ideal for researchers, technical professionals, and advanced users who require ChatGPT’s strongest reasoning capabilities for high-precision, high-complexity work

Audience

Developers, engineering teams, and knowledge-work organizations wanting to build multimodal AI agents for coding, research, analysis, and other complex multi-step tasks

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

$0.04 per input
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Pros & Cons from Real Users

Pros

  • GPT-5.1 Pro is an absolute powerhouse for deep reasoning and high-complexity tasks. Its expanded context window makes it possible to analyze massive documents, multi-file codebases, and large datasets all within a single session—something general models simply can’t handle at this scale. The upgraded reasoning engine delivers structured, defensible logic, enabling professional-grade work in fields like scientific research, legal analysis, quantitative finance, and advanced data modeling. It also excels at following nuanced instructions with precision, providing predictable, consistent, and goal-aligned output across extended workflows.

Cons

  • Because GPT-5.1 Pro is designed specifically for rigorous analysis, it does not support Canvas or image generation features. Users seeking creative or visual outputs will need to switch to other models. Additionally, its emphasis on depth and accuracy means responses aren’t always as fast as those from instant-response models—which is a fair trade-off, but worth noting for users expecting speedy, lightweight interactions.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

OpenAI
Founded: 2015
United States
openai.com

Company Information

StepFun
Founded: 2023
United States
platform.stepfun.ai/docs/en/guides/models/step-5-preview

Alternatives

Alternatives

No Alternatives
Claude Opus 4.1

Claude Opus 4.1

Anthropic
Claude Opus 4.5

Claude Opus 4.5

Anthropic

Categories

Categories

Integrations

Python
Amp
Azure OpenAI Service
Bash
ClinePass
Doraverse
Ghost
GitHub
Hugging Face
Java
Kimi K2 Thinking
LaunchLemonade
Microsoft 365 Copilot
NextDocs
OpenAI Codex
OpenCode
Qwen Studio
React
TypeScript
Visual Studio Code

Integrations

Python
Amp
Azure OpenAI Service
Bash
ClinePass
Doraverse
Ghost
GitHub
Hugging Face
Java
Kimi K2 Thinking
LaunchLemonade
Microsoft 365 Copilot
NextDocs
OpenAI Codex
OpenCode
Qwen Studio
React
TypeScript
Visual Studio Code
Claim GPT-5.1 Pro and update features and information
Claim GPT-5.1 Pro and update features and information
Claim Step 5 Preview and update features and information
Claim Step 5 Preview and update features and information