“(It certainly was not the long-awaited GPT-5).”
Our reading, the sentence that was checked:
OpenAI's o3 is not the long-awaited GPT-5.
Assessment: Supported Evidence as of
Where and when Gary Marcus wrote it
Marcus on AI, o3, AGI, the art of the demo, and what you can expect in 2025, paragraph 2.
- Said
- Source observed
- live page, full text, public
- Evidence as of
- the cutoff for this assessment
- Assessment recorded
- assessment marcus-o3-agi-the-art-of-the-demo-and-what-9b659d-a1
We recorded 15 claims from this post. See every claim from this post.
The wording above is the version this site observed on 2026-10-28. The source may have been edited after 2024-12-21. This page does not claim the wording was captured then.
What the claim commits to
- Kind
- Observation
- Deadline, as the speaker wrote it
- None stated. This site does not add one.
- Deadline state when assessed
- No horizon
- Deadline state on 2026-10-29
- No horizon (the release’s reference date)
From the speaker
- OpenAI revealed o3 in a 25 minute live demo
- It certainly was not the long-awaited GPT-5
Our interpretation
- Plain reading: the model OpenAI showed on 20 December 2024 was o3, a model OpenAI presented as distinct from GPT-5 and not as GPT-5 under another name.
- The claim describes the demo day, 20 December 2024. A later separate GPT-5 launch is context that confirms the two were distinct products.
Counts as supported if: Records from the announcement show OpenAI presented the model as o3, the successor to o1, and not as GPT-5.
Counts as contradicted if: OpenAI presented o3 as GPT-5, or later said o3 was the model released as GPT-5.
Retrospective: these criteria were written after the outcome was public.
Current assessment
Was it true for the period described?
Outcome: Supported
The dated evidence matches what the claim committed to, under the criteria frozen before grading.
Scored on a plain reading. The speaker named no measure for this claim, so it was judged on the reading an informed reader would take, stated below under our interpretation. Both reviews had to find that reading fair.
- Evidence as of
- Deadline state when assessed
- No horizon
- Assessment recorded
- Policy version
- 2026-10-28.7
Rationale
On 20 December 2024 OpenAI presented the new model as o3, the successor to its o1 reasoning model, not as GPT-5. In August 2025 OpenAI launched GPT-5 as a separate model and said it replaced o3 in ChatGPT. So o3 was not GPT-5.
Limitations
- The core evidence for the demo day is a news report, not an OpenAI page from that day.
Evidence (2 items)
Supports the claim: TechCrunch,
On Friday, the company unveiled o3, the successor to the o1 “reasoning” model it released earlier in the year.
Why it matters here: On the day of the demo, the model was presented as o3, the next o-series reasoning model, not as GPT-5.
- Where
- paragraph 2
- Publisher
- TechCrunch
- Kind of source
- News report
- Describes events of
- Public from
Supports the claim: OpenAI,
GPT‑5 is the new default in ChatGPT, replacing GPT‑4o, OpenAI o3, OpenAI o4-mini, GPT‑4.1, and GPT‑4.5 for signed-in users.
Why it matters here: OpenAI later launched GPT-5 as a separate model that replaced o3. This confirms o3 was not GPT-5.
- Publisher
- OpenAI
- Kind of source
- Company disclosure: the company describing itself, not an independent finding
- Describes events of
- Public from
Where it was said (1)
Said once in the sources this register covers.
: Marcus on AI, o3, AGI, the art of the demo, and what you can expect in 2025
(It certainly was not the long-awaited GPT-5).
- Where
- paragraph 2
- Published
- 2024-12-21
- Source observed
- , live page
- Access
- full text, public
History
Assessment versions
- Assessment marcus-o3-agi-the-art-of-the-demo-and-what-9b659d-a1: Current. Outcome: Supported. Evidence as of 2026-10-28. Public date not recorded.
Recorded events
Assessment publishedBy this site
First assessment published after both reviews and the final-text check passed.
About assessment marcus-o3-agi-the-art-of-the-demo-and-what-9b659d-a1.