OpenAI Introduces Its Flagship Model ‘GPT-5’, Making It the New Default in ChatGPT

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IBL News
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IBL News | New York

OpenAI unveiled its latest model, GPT-5 yesterday, making it available to all ChatGPT users, including those on the free tier, with usage limits varying by subscription level.

It is also integrated into Microsoft 365 Copilot and available to developers through the OpenAI API.

The company made GPT‑5 the new default in ChatGPT, replacing GPT‑4o, OpenAI o3, OpenAI o4-mini, GPT‑4.1, and GPT‑4.5 for signed-in users.

GPT‑5 started to roll out today to all Plus, Pro, Team, and Free users, with access for Enterprise and Edu coming in one week. Pro, Plus, and Team users could also start coding with GPT‑5 in the Codex CLI⁠ by signing in with ChatGPT.

Pro subscribers got unlimited access to GPT‑5, and access to GPT‑5 Pro, for complex tasks and a replacement of OpenAI o3‑pro. Plus users have significantly higher usage than free users.

“For ChatGPT free-tier users, full reasoning capabilities may take a few days to fully roll out. Once free users reach their GPT‑5 usage limits, they will transition to GPT‑5 mini, a smaller, faster, and highly capable model,” said OpenAI.

During a livestream presentation [watch in the video below], the company’s CEO, Sam Altman, described the model as “having a team of experts on call for whatever you want to know.” He defined it as “our smartest, fastest, most useful model yet, with built-in thinking that puts expert-level intelligence in everyone’s hands.”

GPT‑5 provides more useful responses across math, science, finance, and law. It includes 128,000 max output tokens. The price per 1 million tokens for the API is $1.25.

The tools supported by this model when using the Responses API are Web search, File search, Image generation, Code interpreter, and MCP.

OpenAI’s executives who participated in the virtual presentation highlighted the coding capabilities of GPT-5, tackling “complex tasks end-to-end and delivering more readily usable code, better design, and is more effective at debugging.”

GPT‑5 is OpenAI’s most advanced model for coding and agentic tasks. It produces high-quality code, generates front-end UI with minimal prompting, and shows improvements to personality, steerability, and executing long chains of tool calls.”

GPT‑5 also showed ‘minimal’ reasoning and a ‘verbosity’ parameter in the API.

 

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