AI Radar

GPT-5.3 Instant

Retired · Language, Multimodal

GPT-5.3 Instant is an update to the Instant model in OpenAI's ChatGPT for text and image input, released on 3 March 2026 to all ChatGPT users and in the API as gpt-5.3-chat-latest. OpenAI says it refuses less often without need and adds fewer defensive preambles. No GPT-5.3 Thinking model was released. [1] [2]Model details [3]Introduction Primary source

Timeline of GPT-5.3 Instant →

Claims and evidence

  • Released Primary source[1]Availability [4]Mar 3 (2026)
  • Deprecated Primary source[5]2026-05-08: gpt-5.2-chat-latest and gpt-5.3-chat-latest model snapshots
  • Retired Primary source[5]2026-05-08: gpt-5.2-chat-latest and gpt-5.3-chat-latest model snapshots
  • Status RetiredIts only API form, gpt-5.3-chat-latest, was shut down on 2026-08-10. In ChatGPT it was replaced as the default by GPT-5.5 Instant on 2026-05-05 and stayed available to paid users for three months before retirement; no dated ChatGPT retirement entry was found. Primary source[5]2026-05-08: gpt-5.2-chat-latest and gpt-5.3-chat-latest model snapshots [6]May 5, 2026: GPT-5.5 Instant in ChatGPT
  • Replaced by GPT-5.5 InstantGPT-5.5 Instant replaced it as the ChatGPT default and in the API as chat-latest. The deprecations page names gpt-5.6-sol as the replacement for gpt-5.3-chat-latest. Primary source[7]Availability [6]May 5, 2026: GPT-5.5 Instant in ChatGPT
  • Successor of GPT-5.2The post compares GPT-5.3 Instant with GPT-5.2 Instant throughout and moves GPT-5.2 Instant to the legacy models; GPT-5.2 Instant is part of the GPT-5.2 record. Primary source[1] [8]Introduction
  • Change · Safety OpenAI says it gives fewer unnecessary refusals and fewer defensive or moralizing caveats than GPT-5.2 Instant.Compared with GPT-5.2 Primary source[1]
  • Change · Tool use OpenAI says it balances web search results better with its own knowledge, for example to put recent news in context.Compared with GPT-5.2 Primary source[1]
  • Change · Other OpenAI reports fewer hallucinations in its internal evaluations, with or without web access.Compared with GPT-5.2 Primary source[1]
  • Change · Other OpenAI describes a more focused conversational style with fewer unwarranted assumptions about user intent or emotions.Compared with GPT-5.2 Primary source[1]
  • Input text, image Primary source[2]Model details
  • Output text Primary source[2]Model details
  • Feature Function calling Primary source[2]Supported features
  • Context window 128,000 tokensThe docs also list a maximum of 272,000 input tokens. Primary source[2]Model details
  • Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
  • Access consumer app, API Primary source[1]Availability

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