GPT-4.5

Timeline

1. 2025-02-27 · Product update · evidence link

1. 2026-11-14T02:21:52.804Z · Alex's posts · model family · OpenAI · official articles
   Excerpt

   GPT‑4.5 Preview will be turned off in three months, on July 14, 2025, to allow time for developers to transition

2. 2026-11-14T00:29:48.887Z · Evidence links · OpenAI · official articles
3. 2026-11-10T17:59:50.472Z · Catalogue listing · GitHub · openai/openai-agents-python · code
   Excerpt

   mport ThreadPoolExecutor # import logging # logging.basicConfig(level=logging.INFO) # logging.getLogger("openai").setLevel(logging.DEBUG) OPENAI_MODEL = os.environ.get("OPENAI_MODEL", "gpt-5.6-sol") ENABLE_CODE_SNIPPET_EXCLUSION = True # gpt-4.5 needed this for better quality ENABLE_SMALL_CHUNK_TRANSLATION = False SEARCH_EXCLUSION = """--- search: exclude: true --- """ # Define the source and target directories source_dir = "docs" REPO_ROOT = Path(__file__).resolve().parents[2] languages = { "ja": "Japanese", "ko": "Korean", "zh": "Chinese", # Add more languages here, e.g., "fr": "French" } # Initialize OpenAI client api_key = os.getenv("OPENAI_API_KEY") openai_client = OpenAI(api_key=api_key) # Define dictionaries for translation control do_not_translate = [ "OpenAI", "Agents SDK", "Hello World", "Model context protocol", "MCP",

   This code reference does not establish a working model identifier.

4. 2026-11-05T14:39:16.565Z · Evidence links · OpenAI · Model release notes
5. 2026-11-05T14:39:16.565Z · Evidence links · OpenAI · Model release notes
   Excerpt

   GPT-4.5 is available worldwide for users on the Pro plan in ChatGPT

6. 2026-10-07T18:13:28.058Z · Evidence links · OpenAI · ChatGPT release notes
   Excerpt

   As of June 26, 2026, GPT-4.5 is no longer available in ChatGPT, including for custom GPTs

7. 2026-10-07T18:13:28.058Z · Evidence links · OpenAI · ChatGPT release notes
8. 2026-08-06T17:53:02.905Z · Alex's posts · Alex Getman
   Excerpt

   🚨 OpenAI is launching GPT 6 Astra next week It is a brand new model trained from scratch and the company’s largest since GPT 4.5. The latest internal build, codenamed mewfour, is already the release candidate.

   The forecast timing did not hold; retained as an early mention, not a successful prediction.