GPT-5 is Now Available: All you need to know about the update

After a long wait and growing competition, OpenAI has finally released the GPT‑5 series. It says this is its most powerful AI yet. GPT‑5 is a big step up from earlier models, performing better in areas like coding, math, writing, health, and understanding images. It’s built as one smart system that knows when to respond quickly and when to take more time to think carefully and give expert-level answers.

Let’s take deep dive into the details of the milestone update.

What’s New in GPT‑5?

Plenty. Here are the biggest breakthroughs, distilled:

1. Unified Model, Seamless Experience

Gone are the days of choosing between “ChatGPT-4o” and “Pro reasoning mode.” GPT‑5 intelligently routes your request to the right backend, integrating multiple capabilities into a single conversational experience. It just works.

2. Way Smarter, And It Knows What It Doesn’t Know

GPT‑5 has seen massive performance jumps across key areas:

• Math: 94.6% on AIME

• Coding: ~75% verified completion on SWE‑Bench

• Vision: 84% accuracy on visual reasoning tasks

• Multilingual prompts: 88%+ on Aider Polyglot

Even more importantly, it hallucinates significantly less—nearly 45% less than GPT‑4o, and 80% less than GPT‑4-turbo when reasoning. And when it doesn’t know something? It’s more likely to tell you.

3. Bigger Memory, Better Context

With longer context windows and memory that retains your style, preferences, and past queries, GPT‑5 can handle more complex workflows without losing the thread. Great for long docs, big data, or detailed planning.

4. Dramatically Lower Hallucination Rates

One of the most frustrating limitations of previous large language models (LLMs) was hallucination - where the AI confidently produced false or misleading information. GPT-5 changes that:

• 45% fewer hallucinations than GPT-4o

• 80% fewer hallucinations in reasoning tasks compared to GPT-4-turbo

GPT-5 is not just better at guessing answers - it’s also better at knowing what it doesn’t know, and more willing to say so.

5. More Agentic, Less Robotic

GPT‑5 is better at executing multi-step instructions and using external tools. It’s edging toward being an “AI assistant” in the truest sense - something that can do things for you, not just talk about them. The model is better, compare to previous ones, for supporting AI Agent(what is an AI agent?) tasks.

6. Tool Use and Agentic Capabilities

OpenAI has quietly but consistently been moving toward agentic AI - tools that can autonomously complete multistep tasks. GPT-5 takes a meaningful step forward here.

• It can integrate with tools like code interpreters, file uploaders, databases, and APIs.

• It’s better at using tools mid-conversation - asking follow-up questions, checking assumptions, and correcting errors.

• It enables multi-step workflows (e.g., “Analyze this PDF, summarize the contents, and create a slide deck”).

Whether in ChatGPT Enterprise or API integrations, GPT-5 makes AI more functional, more proactive, and more reliable.

API Change

The most API usage remain the same. However, one important update is that the new GPT-5 series models(including gpt-5, gpt-5-mini, gpt-5-nano, and gpt-5-chat) no longer support custom temperature values. Developers should take note of this change. If your API implementation includes a custom temperature setting when calling GPT-5 models, you are likely to encounter an error message.:

openai.BadRequestError: Error code: 400 - {'error': {'message': "Unsupported value: 'temperature' does not support 0.5 with this model. Only the default (1) value is supported.", 'type': 'invalid_request_error', 'param': 'temperature', 'code': 'unsupported_value'}}

GPT-5 Token Price

OpenAI made GPT-5 cheaper in input tokens and more expensive in output.

See price chart between input token vs output token

*gpt-5 input vs output price per million tokens

*gpt-4.1 input vs output price per million tokens

Why It Matters

This is about more than benchmarks. GPT‑5 represents a deeper design shift: AI that’s invisible, intuitive, and integrated. You don’t need to think like a machine to use it. It’s starting to think like you.

The metaphor here isn’t "Google but smarter." It’s more like a colleague who can code, design, summarize, research, and visualize - instantly, and often better than a human generalist. One that knows when it’s out of its depth, too.

In Nutshell

GPT‑5 is a milestone. Not because it’s perfect - it isn’t. But because it’s the first time an AI model feels like something you don’t have to manage.

You ask.
It thinks.
It acts.
It tells you if it can’t.
And most of the time—it just does stuff.

How It Impact AI Agents

AgentX has fully integrated and onboarded the latest OpenAI model, GPT-5, GPT-5-mini, and GPT-5-nano.

You can now pick your new favorite model to power your AI Agents.