OpenAI Simply Upgraded ChatGPT's Default Mannequin—Right here's What GPT-5.5 Prompt Truly Does – Decrypt

OpenAI simply swapped out the engine inside ChatGPT. Beginning right this moment, GPT-5.5 Prompt replaces GPT-5.3 Prompt because the default mannequin utilized by lots of of tens of millions of people that open ChatGPT day-after-day.

This is not a flashy launch; no new mode, no jaw-dropping demo. However “small enchancment” is a relative time period when the improve cuts hallucinations by greater than half.

What’s GPT-5.5 Prompt?

OpenAI’s GPT household ships in tiers. Prompt is the on a regular basis mannequin, constructed for pace and basic use; Pondering is the slower, extra analytical model for complicated issues; and Professional is the heavyweight for maximum-intensity duties.

GPT-5.5 Prompt is the newest replace to the tier that the majority ChatGPT customers will work together with, whether or not they notice it or not.

In accordance with OpenAI, the brand new mannequin produced fewer hallucinated claims than GPT-5.3 Prompt on high-stakes prompts in medication, legislation, and finance. Hallucinations have been ChatGPT’s most persistent flaw because the starting.

OpenAI additionally examined in opposition to conversations actual customers had beforehand flagged for factual errors. On these, inaccurate claims dropped by 37.3%.

On HealthBench—a benchmark testing AI responses to actual medical questions, scored from 0 to 100— GPT-5.5 Prompt scores 51.4 factors, up from 49.6. On HealthBench Skilled, the clinical-use model, it jumps from 32.9 to 38.4 factors.

Well being questions are among the many commonest issues folks ask ChatGPT, which makes getting them proper greater than a benchmark train. These outcomes imply GPT 5.5 Prompt elevated accuracy by responding appropriately 38.4% of the time.

GPT-5.5 Prompt additionally pulls extra actively out of your previous chats, saved recordsdata, and linked Gmail account to make solutions personally related. Now when it does this, it reveals you precisely what context it used, and allows you to delete or appropriate it. “You stay accountable for what’s in your reminiscence,” OpenAI wrote. Momentary chats nonetheless decide out solely.

The place it matches—and what it is not

When Decrypt coated the GPT-5.5 household launch two weeks in the past, the story was agentic coding and terminal workflows. GPT-5.5 Prompt is a special animal—it handles extra “fundamental” stuff like your meal plans and e-mail drafts, not autonomous multi-step coding pipelines. Don’t ask us about GPT 5.4 Prompt, although. It’s most likely chilling subsequent to the O2 mannequin that by no means existed.

The complete GPT-5.5 scores 82.7% on Terminal-Bench 2.0, which measures complicated command-line process efficiency. Prompt is what the remainder of us get, and doubtless what a lot of the customers will most likely be high-quality working with.

One notable footnote within the system card: GPT-5.5 Prompt is the primary Prompt-tier mannequin OpenAI classifies as “Excessive Functionality” in each cybersecurity and organic domains—succesful sufficient to require the identical automated safeguards beforehand reserved for the extra highly effective Pondering variants. It will not assist you hack something, however OpenAI constructed guardrails in case somebody tries.

The earlier default, GPT-5.3 Prompt, launched in March with guarantees of fewer preachy refusals and higher accuracy. GPT-5.5 Prompt continues that trajectory. Paid subscribers preferring the previous model have three months earlier than GPT-5.3 Prompt is retired. Enhanced personalization by way of Gmail rolls out first to Plus and Professional customers on the net, with Free, Go, Enterprise, and Enterprise to observe within the coming weeks.