Pundit ClaimsAI claims by Gary Marcus and Ed Zitron, with the evidence

Gary Marcus Observation First said

“Anthropic has taken a lot of the business market and OpenAI has lost a lot of it.”

Breaking news, and how the end might begin, paragraph 17. The full statement is at the source.

Our reading, the sentence that was checked:

Anthropic has taken a large share of the business market while OpenAI has lost much of it.

Assessment: Supported Evidence as of

Where and when Gary Marcus wrote it

Marcus on AI, Breaking news, and how the end might begin, paragraph 17.

Said
Source observed
live page, full text, public
Evidence as of
the cutoff for this assessment
Assessment recorded
assessment marcus-breaking-news-and-how-the-end-might-2b3f1d-a2

We recorded 22 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 2026-06-10. 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

  • Anthropic has taken a lot of the business market
  • OpenAI has lost a lot of it

Our interpretation

  • The plain reading concerns relative enterprise market share, not necessarily falling customer counts or revenue.
  • I interpret the business market as enterprise purchases and use of foundation-model services, including APIs.
  • The surrounding comparison with a few years ago supports a trend beginning around 2023 and ending before the post.
  • Large movements in market share count as substantial; Marcus supplies no numerical threshold.
  • This is a market-share claim, not a claim about either company’s recognized revenue.

Counts as supported if: A credible enterprise market-share series shows a substantial Anthropic gain and substantial OpenAI share loss over the comparison period.

Counts as contradicted if: Comparable enterprise market-share measurements show no substantial Anthropic gain or no substantial OpenAI share loss.

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

Menlo’s December 9, 2025 release reports that Anthropic’s enterprise LLM API share rose from 12% in 2023 to 40% in 2025, while OpenAI’s fell from 50% to 27%. These substantial movements support the relative-market-share claim within that market [e1]. Ramp reports that Anthropic’s business adoption quadrupled over the year through April 2026, while OpenAI’s increased slightly; this does not establish a decline in OpenAI’s customer count [e2].

Limitations

  • Enterprise LLM API share does not measure the entire business AI market [e1].
  • Menlo lists Anthropic among its portfolio companies [e1].
  • The share and adoption figures do not establish falling OpenAI revenue or customers switching directly from OpenAI to Anthropic [e1, e2].

Evidence (2 items)

  • Supports the claim: Menlo Ventures, distributed by GlobeNewswire,

    OpenAI ceded nearly half its share.

    Why it matters here: Menlo reports Anthropic’s enterprise LLM API share rising from 12% in 2023 to 40% in 2025, while OpenAI’s fell from 50% to 27%. Both movements are substantial under the ordinary share-based reading.

    Publisher
    Menlo Ventures, distributed by GlobeNewswire
    Kind of source
    Independent measurement
    Describes events of
    Public from
  • Context only: Ramp,

    OpenAI grew business adoption

    Why it matters here: Ramp independently reports rapid Anthropic adoption growth, but a small annual increase for OpenAI. Its adoption-rate denominator differs from enterprise API market share, so it limits a customer-loss interpretation rather than contradicting the selected share-based claim.

    Publisher
    Ramp
    Kind of source
    Independent measurement
    Describes events of
    Public from

Where it was said (1)

Said once in the sources this register covers.

  • : Marcus on AI, Breaking news, and how the end might begin

    Anthropic has taken a lot of the business market and OpenAI has lost a lot of it.

    Published
    2026-06-10
    Source observed
    , live page
    Access
    full text, public

History

Assessment versions

Recorded events

  1. Assessment publishedBy this site

    First assessment published after both reviews and the final-text check passed.

    About assessment marcus-breaking-news-and-how-the-end-might-2b3f1d-a2.