The Stack Index / Reasoning / ChatGPT
Reasoning · serves AI Layer
ChatGPT
ChatGPT is used in the reasoning layer by 2 operators documented on GTM Vault, including Jason Patel, Open Forge AI, where it ran as the generative engine optimised for.
Who named it, and what it did
One entry per episode. Mentions in passing, sponsor reads and guest biographies are not counted.
Jason PatelOpen Forge AIGenerative engine optimised for
Operator evidence · GTM 34From SEO to GEO: When AI Search Becomes DistributionThe episode →
Michele ShepardEmburseEnterprise ChatGPT holding messaging, content and roadmaps
Operator evidence · GTM 31AI as the Revenue Intelligence LayerThe episode →
Run the system yourself
Revenue intelligence layerFree Claude skill, built from Michele Shepard’s system on GTM 31 →Get cited by AI searchFree Claude skill, built from Jason Patel’s system on GTM 34 →For the ChatGPT team
2 operators put ChatGPT on the record.
Each operator above described ChatGPT running inside a working revenue system, in their own words, one citation per episode. The record is yours to share.
Placement, order and counts are never for sale. How the index works.
Share the record
Free. It states the count and nothing else, and updates itself, so it can go down as well as up. The only condition is that it links back to this page.
Add a customer
Put a customer forward for Show Me Your StackA customer walks through the system they built with ChatGPT. If it holds up, it goes on the record.
See which stacks this tool shows up in next
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Runs alongside
Tools that appear in the same operators’ stacks as ChatGPT. The count is how many of those operators run both.
Compared on the record
Who runs each, who runs both, and the displacements operators said out loud. Counts, not opinions.
Others in reasoning
Common questions
- Which operators use ChatGPT?
- 2 operators on GTM Vault have described running ChatGPT in a working system: Jason Patel (Open Forge AI) and Michele Shepard (Emburse). Each entry is one citation per episode, in the operator's own words. Jason Patel, Open Forge AI described it as the generative engine optimised for (GTM 34).
- What layer of revenue architecture does ChatGPT serve?
- ChatGPT is placed on the Reasoning layer, which serves AI Layer in the eight-layer model of revenue architecture. The models and agent runtimes that score, decide, draft and build. Placement follows the job the tool did in an operator's system, not the category its marketing claims.
- What runs alongside ChatGPT?
- In the stacks of operators who run ChatGPT, the tools that appear most often are Claude (1), Gong (1), Marketo (1), Outreach (1) and Capterra (1). The number is how many of those operators run both.
- What entry tier is ChatGPT?
- ChatGPT is listed at the self-serve tier. The index records budget as a posture (self-serve, mid-market, enterprise), not a price, because public pricing in this category is unreliable.