If the S&P 500 rule changes are adopted, OpenAI's and Anthropic's IPOs may likewise be added quickly to index funds at fantasy-level early valuations, leaving retirement investors exposed to rapid price drops.

Assessment: Can’t be checked Not checked against evidence

Where and when Gary Marcus wrote it

Marcus on AI, This one weird trick might cost your retirement fund billions, paragraph 16.

Said: 2026-05-22
Source observed: 2026-10-28live page, full text, public
Evidence: Not checkedboth screens found it cannot be checked
Assessment recorded: 2026-10-29assessment marcus-this-one-weird-trick-might-cost-your-519cc6-a1

We recorded 2 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 2026-05-22. This page does not claim the wording was captured then.

What the claim commits to

Kind: Conditional forecast
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)

Conditions

if S&P 500 adopts proposed rule changes (antecedent, stated by the speaker)
if quickly added to S&P 500 at high early valuation (antecedent, stated by the speaker)

From the speaker

if S&P 500 adopts proposed rule changes
if quickly added to S&P 500 at high early valuation

Our interpretation

None added.

This claim is not graded on evidence. The record checks that the words are quoted correctly and attributed to the right person, and that the claim is classified correctly.

Current assessment

Not graded on evidence

Outcome: Can’t be checked

Both AI providers screened this claim on their own and found that public evidence could not settle it. It is recorded and attributed, not scored.

Why it can’t be checked

Both screens gave the same reason:

Stated as a chance or a possibility, or at medium or low confidence.

Evidence: Not checked
Deadline state when assessed: No horizon
Assessment recorded: 2026-10-29
Policy version: 2026-10-28.7

Rationale

Not checked against evidence. Two independent screens, one from each provider, both found this stated as a chance or a possibility, or at medium or low confidence.

Limitations

None recorded.

Evidence (0 items)

No evidence was searched for. Both screens found that public evidence could not settle this claim.

This claim is about OpenAI, and models from OpenAI worked on this record: gpt-6-astra screened it. Agreement between models is a check, not proof.

This claim is about Anthropic, and models from Anthropic worked on this record: claude-opus-5-5 extracted it and claude-opus-5-5 screened it. Agreement between models is a check, not proof.

This claim was not checked against evidence. claude-opus-5-5 (Anthropic) extracted it from the post and wrote the sentence at the top, our reading of the claim. claude-opus-5-5 (Anthropic) and gpt-6-astra (OpenAI) then screened it independently, without seeing each other’s answers. Both confirmed that the sentence says what the author said, and both found that public evidence could not settle the claim. No model wrote the assessment: code composed its text from the two screens, so there was no separate check of the final text. Code, not a model, decided whether it could be published.

Agreement between models is a check on the record, not proof that the assessment is right. Anthropic and OpenAI make these models, and some claims on this site are about those companies. How the method works.

Where it was said (1)

Said once in the sources this register covers.

2026-05-22: Marcus on AI, This one weird trick might cost your retirement fund billions
Same logic may well apply to the upcoming IPOs of OpenAI and Anthropic.
Where
paragraph 16
Published
2026-05-22
Source observed
2026-10-28, live page
Access
full text, public

History

Assessment versions

Assessment marcus-this-one-weird-trick-might-cost-your-519cc6-a1: Current. Outcome: Can’t be checked. Not checked against evidence. Public date not recorded.

Recorded events

2026-10-29
Assessment publishedBy this site
First assessment published after both reviews and the final-text check passed.
About assessment marcus-this-one-weird-trick-might-cost-your-519cc6-a1.