GPT-5.5 Instant

Claims and evidence

• Released 5 May 2026 ● Primary source[1]Availability [2]May 5, 2026: GPT-5.5 Instant in ChatGPT [3]May 5 (2026)

• Status Status unknownNever offered under its own API id: it was served through the moving alias chat-latest, which is not deprecated. On 2026-08-06 OpenAI said GPT-5.6 Luna would become the default for Free and Go users that week and that GPT-5.6 Sol now powers Instant responses for Plus and Pro users; no source states whether GPT-5.5 Instant is still selectable or retired. ● Primary source[4]Safety and availability [2]August 6, 2026: Updates to GPT-5.6 in ChatGPT [5]

• Successor of GPT-5.3 InstantReplaced GPT-5.3 Instant as the ChatGPT default; the system card notes there is no GPT-5.4 Instant, so GPT-5.3 Instant is the baseline. ● Primary source[1]Availability [6]Introduction

• Change · Other OpenAI reports fewer hallucinated and inaccurate claims than GPT-5.3 Instant in its internal evaluations.Compared with GPT-5.3 Instant ● Primary source[1]
• Change · Other OpenAI describes shorter, more direct answers with fewer follow-up questions, less formatting and fewer emojis.Compared with GPT-5.3 Instant ● Primary source[1]
• Change · Other Makes better use of context from past chats, files and a connected Gmail account to personalise answers, first for Plus and Pro users on the web.Compared with GPT-5.3 Instant ● Primary source[1]
• Change · Safety First Instant model that OpenAI treats as High capability in cybersecurity and in biological and chemical risk, deployed with matching safeguards.Compared with GPT-5.3 Instant ● Primary source[6]Introduction

• Input text, imageOpenAI describes improved analysis of photo and image uploads. ● Primary source[1]Smarter, more accurate answers [2]May 5, 2026: GPT-5.5 Instant in ChatGPT
• Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
• Access consumer app, APIIn the API only through the chat-latest alias. ● Primary source[1]Availability [3]May 5 (2026)

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