OpenAI AI Updates: May 6, 2026

1. GPT-5.5 Instant Becomes the New ChatGPT Default

OpenAI. GPT-5.5 Instant replaces GPT-5.3 Instant as ChatGPT’s default model and ships in the API as chat-latest. OpenAI reports 52.5% fewer hallucinated claims than 5.3 Instant on high-stakes prompts (medicine, law, finance) and 37.3% fewer inaccuracies on user-flagged hard conversations, alongside a jump on AIME 2025 from 65.4 to 81.2 and meaningful gains on multimodal and STEM reasoning. Responses are also 30% shorter on average with the gratuitous emojis trimmed, and Plus/Pro users get a personalization mode where the model can search past chats, files, and Gmail. GPT-5.3 Instant remains accessible to paid users via model settings for three months before retirement. Source

2. GPT-5.5 Instant System Card Lands Alongside the Launch

OpenAI. OpenAI published the GPT-5.5 Instant system card concurrent with the model rollout, documenting the safety evaluations and red-teaming behind the new default. Pairing a system card with the actual production cutover (rather than weeks later) is the pattern OpenAI has been pushing since GPT-5, and it gives developers planning a migration the safety-eval baseline they need before flipping API traffic. Source

3. ChatGPT Ads Manager Opens to All US Businesses with CPC Bidding

OpenAI. OpenAI broadened its ChatGPT advertising pilot into a self-serve Ads Manager beta open to US businesses of any size, and added cost-per-click bidding alongside the existing CPM model — reportedly with bids in the $3–$5 range as CPMs have softened from around $60 at launch toward $25. The release also brings a Conversions API and pixel-based measurement, with agency partners (Dentsu, Omnicom, Publicis, WPP) and adtech vendors (Adobe, Criteo, Kargo, Pacvue, StackAdapt) plugged into the ecosystem. For practitioners this is the first time ChatGPT ads look like a real performance channel rather than a managed-buy experiment. Source