Start Chatting with GPT-5.4
Use GPT-5.4 and its full model family, with more messages every day.
GPT-5.4: Frontier Model for Professional Work and Coding
Released on March 5, 2026, GPT-5.4 is OpenAI’s frontier model for complex professional work, coding, reasoning, and agentic workflows. It belongs to the GPT-5 family and was introduced as a mainline reasoning model that combines advances in coding, tool use, computer use, and knowledge work.
GPT-5.4 is designed for developers, researchers, analysts, and professional users who need reliable instruction following, long-context reasoning, and practical tool use. Compared with GPT-5.4 mini, it offers a larger context window and stronger overall reasoning performance, while compared with GPT-5.5 it is positioned as a more affordable model for coding and professional work.
GPT-5.4: Key Specs
Below are GPT-5.4's main specs and how they translate into real-world behavior.
- Context Window - 1,050,000 tokens: This very large context window lets GPT-5.4 work with long documents, extensive conversations, large codebases, and multi-source research materials, which is useful for professional workflows that depend on full context.
- Maximum Output Length - 128,000 tokens: This high output limit allows the model to produce long reports, detailed explanations, structured research summaries, and multi-file coding outputs without being limited to short responses.
- Speed and Efficiency - Medium speed profile: GPT-5.4 is not the fastest model in the GPT-5.4 family, but it balances speed with stronger reasoning depth, making it suitable for professional tasks where quality matters more than instant replies.
- Cost Efficiency - $2.50 input and $15.00 output per 1M tokens: GPT-5.4 is priced below newer flagship models while still supporting frontier reasoning, coding, and tool-use workflows, making it a practical option for complex work with cost control.
- Reasoning and Tool Use - Highest reasoning tier with broad tool support: GPT-5.4 supports reasoning effort settings from none through xhigh and works with tools such as function calling, web search, file search, code interpreter, hosted shell, computer use, MCP, and skills, which helps it complete agentic workflows.
- Multimodal Capabilities - Text and image input with text output: GPT-5.4 can process written and visual inputs together while producing text responses, enabling document review, screenshot analysis, visual reasoning, and image-informed research.
Compare GPT-5.4, GPT-5.5, and GPT-5.4 mini
A brief overview of how each model differs in power, speed, and use cases.
| Feature | GPT-5.4 | GPT-5.5 | GPT-5.4 mini |
|---|---|---|---|
| Knowledge Cutoff | Aug 31, 2025 | Dec 01, 2025 | Aug 31, 2025 |
| Context Window (Tokens) | 1,050,000 | 1,050,000 | 400,000 |
| Max Output Tokens | 128,000 | 128,000 | 128,000 |
| Input Modalities | Text, image | Text, image | Text, image |
| Output Modalities | Text | Text | Text |
| Latency (OpenRouter Data) | Medium | Fast | Fast |
| Speed | Medium | Fast | Fast |
| Input / Output Cost per 1M Tokens | $2.50 / $15.00 | $5.00 / $30.00 | $0.75 / $4.50 |
| Reasoning Performance | Highest | Highest | Higher |
| Coding Performance (on SWE-bench Verified) | 57.7% on SWE-Bench Pro; 75.1% on Terminal-Bench 2.0 | 58.6% on SWE-Bench Pro; 82.7% on Terminal-Bench 2.0 | 54.4% on SWE-Bench Pro; 60.0% on Terminal-Bench 2.0 |
| Best For | coding, research, professional knowledge work, tool use, and long-context reasoning | advanced coding, research, knowledge work, tool use, and agentic workflows | fast everyday assistance, efficient coding help, subagents, computer use, and high-volume workflows |
Source: OpenAI GPT-5.4 Documentation
Best Cases to Use GPT-5.4
GPT-5.4 is best suited for professional workflows that require strong reasoning, reliable instruction following, long context, and practical tool use across coding, research, and everyday business tasks.
- For developers: Use GPT-5.4 to work across large codebases, plan changes, debug issues, generate implementation steps, and review code with strong context awareness.
- For research and analysis: Review long documents, synthesize information across sources, compare evidence, and produce structured findings for academic, business, or technical research.
- For knowledge workers: Create reports, spreadsheets, presentations, summaries, and decision-support materials from complex instructions and messy source material.
- For agentic workflows: Build systems that search, call tools, inspect files, use code execution, and coordinate multi-step tasks across applications and data sources.
- For multimodal review: Analyze screenshots, images, charts, forms, and document pages alongside text prompts to produce clear written conclusions.
- For professional automation: Support repeatable workflows such as policy review, operations analysis, customer-support research, and internal reporting where consistency and reasoning quality matter.
How to Access GPT-5.4
Accessing GPT-5.4 is straightforward, and you can choose the option that best fits your workflow, whether you prefer direct API integration or a simple chat-based experience.
1. Official API
You can access GPT-5.4 through the official OpenAI API using the gpt-5.4 model ID. It supports the Responses API and Chat Completions API, includes reasoning controls, and is suitable for coding tools, research systems, agents, and professional automation.
2. EssayDone AI Chat
If you want to use GPT-5.4 without API setup, EssayDone AI Chat provides access to this model through an easy-to-use chat interface.
This option is useful for students, writers, developers, researchers, and professionals who want a simple way to use GPT-5.4 for coding, research, analysis, writing, and everyday professional tasks without managing API keys or developer settings.
Explore More AI Models
Find the model you need-search or select to open its full profile.
19 models available
FAQ
Here are some frequently asked questions about GPT-5.4.
Yes. GPT-5.4 is a reasoning model with OpenAI’s highest reasoning tier and supports reasoning effort settings from none through xhigh, making it suitable for complex coding, research, and multi-step professional work.
GPT-5.4 costs $2.50 per 1M input tokens and $15.00 per 1M output tokens under standard OpenAI API pricing. OpenAI states that very long prompts above its long-context threshold may be billed at higher rates.
GPT-5.4 is optimized for coding, professional knowledge work, research, document-heavy workflows, tool use, computer use, and agentic tasks that require strong reasoning and long context.
GPT-5.4 accepts text and image inputs and produces text outputs. This makes it useful for visual analysis, screenshots, document review, interface reasoning, and tasks that combine written and visual context.
Compared with GPT-5.5, GPT-5.4 is more affordable but less current as a frontier model. Compared with GPT-5.4 mini, GPT-5.4 has a larger context window and stronger overall reasoning, while GPT-5.4 mini is faster and cheaper for high-volume work.
Using GPT-5.4 in EssayDone AI Chat gives users a simple chat-based way to apply the model to writing, coding, research, and analysis without setting up the official API or managing developer configuration.