Real public-source records, manually reviewed. This is a dated snapshot, not a continuous live feed or a representative market survey.
Counts describe the current snapshot. The time window applies to movement history below.
OpenAI3
Distinct companies naming OpenAI in covered disclosures.
Anthropic3
Distinct companies naming Anthropic in covered disclosures.
Both providers disclosed100%
3 of 3 companies naming at least one provider. Co-disclosure is a potential co-adoption signal, not confirmed joint production usage.
Industry mix in this sample
Customer service softwareOpenAI 1 · Anthropic 1
Developer toolsOpenAI 2 · Anthropic 2
Changes in the last 12 months
History unavailable. This window runs from 2025-09-15 to 2026-09-15. Our reviewed baseline begins 2026-09-10. Additions, removals, switches, and net change cannot yet be calculated. This does not mean there were zero changes.
OpenAI → Anthropic switchesUnavailable
Requires matched, dated before-and-after sources.
Anthropic → OpenAI switchesUnavailable
Co-disclosure alone does not show a switch.
Net movementUnavailable
Initial observations are not new adoptions.
Companies and source disclosures
These lists also serve as the OpenAI and Anthropic customer evidence for this comparison.
OpenAI and Anthropic subprocessor evidence. Observation dates are review dates, not adoption dates.
The published subprocessor list names this provider for the stated processing purpose.
Direct vs. cloud-mediated usage
3 companies name a provider directly in their disclosure. The reviewed records do not establish whether requests go directly to the provider or through Azure OpenAI, Amazon Bedrock, or Vertex AI. No delivery-route percentages are inferred. An AWS infrastructure disclosure alone is not evidence of a particular Bedrock model.
Anthropic vs ChatGPT is not a like-for-like label
Anthropic is the organization behind Claude. ChatGPT is an assistant product from OpenAI. A product comparison would normally compare Claude with ChatGPT; a provider comparison compares Anthropic with OpenAI.
This page makes that distinction selectable. Our reviewed records support provider relationships. They do not identify product subscriptions, assistant seat counts, or which model a company calls.
ChatGPT vs Anthropic for an enterprise workflow
Define whether you are evaluating an assistant for employees, an API used by your product, or access through a cloud provider. Then verify the configuration, integration, and data-processing conditions for that route.
A source naming OpenAI does not establish ChatGPT adoption. A source naming Anthropic does not establish a particular Claude application or model version. We do not fill those gaps with inferred product counts.
Observed overlap and historical movement
The provider view supports industry filters and requested movement windows. Its overlap rate uses distinct companies in the union of the two provider samples.
A current or newly reviewed source is not a historical panel. Switches, net movement, and product-specific trends remain unavailable. The linked source dates are review dates, not purchase dates.
A public job board supports an ATS observation. A subprocessor disclosure identifies a provider that may process data for particular services. A vendor customer story describes a published relationship. These sources have different scopes and are labeled separately.
Counts cover the records on these pages, not the whole market. No observation in our covered sources does not mean a company does not use a vendor. Source recency and unresolved conflicts affect confidence; observations do not establish spend, renewal timing, or customer churn.