Discover OpenAI's GPT-5.1-Codex for Coding

Unlock your coding potential with GPT-5.1-Codex's advanced capabilities.

Input: text · image Output: text Context: 400,000 tokens Release: 2025-11-13

GPT-5.1-Codex, released on November 13, 2025, is a model by OpenAI designed specifically for software engineering. With a context window of 400,000 tokens, it accepts both text and image inputs, producing text outputs. This model excels in interactive development and can handle complex engineering tasks, including project creation, debugging, and code reviews. Codex adapts its reasoning effort based on the task, offering quick responses for small jobs and sustained performance for larger projects. It integrates seamlessly into various developer environments, enhancing productivity with its multimodal capabilities and tool integration.

Use Cases

Here are a few ways teams apply OpenAI: GPT-5.1-Codex in practice—from fast drafting to multimodal understanding. Adapt these ideas to your workflow.

Build projects from scratch efficiently

Develop and debug features seamlessly

Conduct thorough code reviews

Refactor code at scale

Integrate tools for enhanced workflows

Key Features

A quick look at the capabilities that make this model useful in real projects.

Optimized for software engineering tasks

Handles multimodal inputs like images

Supports structured code reviews

Integrates into developer environments

Adjustable reasoning effort for tasks

Specs

Overview

Vendor
openai

Model ID
openai/gpt-5.1-codex

Release
2025-11-13

Modalities & context

Input
text · image

Output
text

Context
400,000 tokens

Parameters & defaults

Supported parameters: include_reasoning, max_tokens, reasoning, response_format, seed, structured_outputs, tool_choice, tools

Defaults: temperature 0.2, top_p 0.95

Benchmark tests: OpenAI: GPT-5.1-Codex

We ran this model against a few representative prompts to show its range. Review the outputs below and be the judge.

Text

Prompt:

Write 150 words on how AI might positively upend work, leisure and creativity

Artificial intelligence promises to positively upend work, leisure, and creativity by automating repetitive tasks while amplifying uniquely human strengths. In the workplace, AI-driven data interpretation and predictive analytics can expose hidden opportunities, freeing employees to cultivate strategic thinking, interpersonal collaboration, and informed decision-making. When routine chores consume less time, professionals may iterate faster and pursue continual learning, creating agile workplaces infused with curiosity. Leisure also gains depth: personalized recommendations can curate immersive experiences, while AI-managed logistics simplify travel, events, and household planning, letting people focus on meaningful interaction rather than tedious coordination. Creativity receives a generative partner—algorithms capable of suggesting novel harmonies, visual motifs, or narrative arcs based on vast cultural datasets. Working alongside these tools, artists can prototype ideas rapidly, explore cross-genre fusions, and revive archival techniques. Ultimately, AI’s supportive presence enables individuals to allocate their energy toward purpose, bonding, and experimentation, enriching both productivity and personal fulfillment.

Run this prompt on Upend.AI

Image

Prompt:

Generate an SVG of a pelican riding a bicycle.

Run this prompt on Upend.AI

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Chat with GPT-5.1-Codex

up.end

/ˌəpˈend/

verb

To “upend” means to completely disrupt, overturn, or drastically change the established order or structure of something. It implies a significant shift or alteration that can potentially have far-reaching consequences. When something is upended, it is turned upside down or transformed in a way that challenges conventional norms or expectations. The term often carries a sense of innovation, transformation, and sometimes even a hint of upheaval, indicating that the changes are not just minor adjustments but rather a fundamental reimagining of the status quo.

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