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The Stack Index / Reasoning

serves AI Layer

Reasoning

The models and agent runtimes that score, decide, draft and build.

Cheap to adopt, worthless without context beneath it.

Updated 20 Oct 2026, the date of the latest episode citing a tool in this layer. Cite as: GTM Vault, The Stack Index, “Reasoning”, https://pro.gtmvault.co/stack/layer/reasoning, updated 20 Oct 2026.

6tools placed
6operator verified
0author recommended
Claude Code8 ops
Orchestration environment in plan mode. Alexander Shartsis, Skyp, SMYS 2
Self-serve
Claude4 ops
True or false relevance check on negative reviews, with reasoning. Vinayak Mishra, Slang AI, SMYS 1
Self-serve
ChatGPT2 ops
Generative engine optimised for. Jason Patel, Open Forge AI, GTM 34
Self-serve
Cursor2 ops
Runs Claude Code with parallel agents. Alexander Shartsis, Skyp, SMYS 2
Self-serve
OpenClaw
Runs five personal agents. Gorish Aggarwal, Sybill, GTM 48
Self-serve
Relevance AI
Hosts the multi-agent system behind the rep-facing checkbox. Angelo Quiambao, Intellistack, SMYS 7
Mid-market

Common questions

What is the Reasoning layer?
The models and agent runtimes that score, decide, draft and build. It serves AI Layer in the eight-layer model of revenue architecture. Cheap to adopt, worthless without context beneath it.
Which tools do operators run in the Reasoning layer?
6 tools are placed in the Reasoning layer, 6 of them named by an operator running them in a working system. The most-named are Claude Code (8 operators), Claude (4 operators), ChatGPT (2 operators), Cursor (2 operators) and OpenClaw (1 operator).
How does a tool get placed in the Reasoning layer?
A tool is placed by the function it performed in a named operator's system, described on a Show Me Your Stack or GTM Vault Podcast episode, or by a GTM Vault essay recommendation. The two grades are shown separately and never blended. Placement is not for sale.

Counted with the layers next to it

The reasoning layer is one part of a working system. These pages rank every tool across this layer and the ones it runs with, by how many operators described running each.

The tools GTM engineers run, by operator count · The AI tools operators run in their GTM stack, by operator count

New operator stacks, as they are published

Every Show Me Your Stack episode adds operators and tools to this index. Subscribe to GTM Vault and get each one as it lands.

← Context · All layers · What the layers mean · Orchestration →