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Infrastructure as code · September 2026 Edition

OpenTofu vs Pulumi

Five of twelve models named OpenTofu first on the direct prompt; zero named Pulumi. Both were named by all twelve models and OpenTofu carries 49 labels and Pulumi 66, so the shares are not directly comparable.

OpenTofu

endorsed leader

Named in one category this edition.

Pulumi

accepted challenger

Named in one category this edition.

First-choice share39%7%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.

Negative rate0%6%Negative labels as a share of the product's labels, 0 to 100.

Rank in category#2#3A position in a field of 12; printed, not drawn.

Labels4966A count; the two differ.

The two percentage rows are drawn on one 0 to 100 track, OpenTofu reading right to left. Rank and label count are printed, not drawn.Terraform was named alongside these two in eleven of the twelve direct answers. Terraform vs OpenTofu · Terraform vs Pulumi

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the infrastructure as code page.

By framing

How many of the twelve models made each the first choice, per way of asking, and how many argued against it.

OpenTofuFirst choices, of twelve modelsPulumi

Direct50

Paraphrase50

Comparative13

Budget-constrained1103 against Pulumi

Scale-constrained14

Negative411 against Pulumi

Bars are first choices, 0 to 12 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to twelve.

The direct prompt

The plain question, one answer per model, grouped by where OpenTofu and Pulumi stood in it.

OpenTofu first, Pulumi an alternative

5 of 12 modelsPulumi was named in the answer but not as the choice, or not at all.

GPT-5.4 miniOpenTofu, Terraform alternatives: AWS CloudFormation, Azure Bicep, Pulumi

Gemini 3.5 FlashOpenTofu alternatives: Pulumi, Spacelift, Terraform, env0

Grok 4.1 FastOpenTofu, Terraform alternatives: AWS CloudFormation / CDK, Atlantis, Pulumi

Kimi K2OpenTofu, Terraform alternatives: AWS CDK, Pulumi

GLM 4.7 FlashXOpenTofu, Terraform alternatives: AWS CDK, AWS CloudFormation, Pulumi

Neither was the first choice, one was named

6 of 12 modelsThe answer put something else first and named one of the two as an alternative.

Claude Haiku 4.5Terraform alternatives: AWS CloudFormation, Ansible, Pulumi

Perplexity SonarTerraform alternatives: Ansible, OpenTofu, Pulumi

Mistral SmallTerraform alternatives: AWS CDK, Azure Bicep, OpenTofu, Pulumi

DeepSeek V4 FlashTerraform alternatives: AWS CloudFormation, Ansible, OpenTofu, Pulumi

Qwen 3.7 FlashTerraform alternatives: AWS CDK, Ansible, Azure Bicep, Pulumi

MiniMax M2.5Terraform alternatives: AWS CloudFormation, Pulumi

Neither was named

1 of 12 modelsThe answer made no first choice from these two in this category.

Llama 4 Maverickno first choice

Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.

Small business

OpenTofu leads by twenty-five points.

OpenTofu#2 of 11

Pulumi#3 of 11

The full small business standing →

Mid-marketThe figures above

OpenTofu leads by thirty-two points.

OpenTofu#2 of 12

Pulumi#3 of 12

The full mid-market standing →

Enterprise

OpenTofu leads by five points.

OpenTofu#2 of 14

Pulumi#3 of 14

The full enterprise standing →

What the models said about OpenTofu

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.

“If you require strict open-source guarantees (OSI-approved), consider OpenTofu, which is an established community-led fork of Terraform under the MPL 2.0 license.” Qwen 3.7 Flash · negative prompt · first choice

“OpenTofu | Seamless migration from old Terraform, open-source MPL 2.0 license, and fast-paced community innovation.” Gemini 3.5 Flash · scale prompt · first choice

“the best infrastructure-as-code (IaC) tool is OpenTofu (or Terraform), specifically when self-hosted” Qwen 3.7 Flash · budget prompt · first choice

What the models said about Pulumi

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.

“Pulumi's free tier is limited: The free Individual tier supports only 1 user, making it impractical for teams without paying.” DeepSeek V4 Flash · budget prompt · soft negative

“Team tier is paid (~$40–$150+/user/month); higher learning curve for ops teams not comfortable with programming.” GLM 4.7 FlashX · budget prompt · soft negative

“Pitfalls: Less mature ecosystem/modules than Terraform, "footguns" from general-purpose languages” Grok 4.1 Fast · negative prompt · soft negative

“If your developers are already writing TypeScript/Python, Pulumi or AWS CDK can flatten the learning curve significantly.” Kimi K2 · scale prompt · first choice

“The best infrastructure as code tools in 2026 are Pulumi, Terraform, OpenTofu... Pulumi offers a distinct approach” Claude Haiku 4.5 · comparative prompt · first choice

“Pulumi | Strong multi-language support, excellent secrets engine, and great developer UX.” Gemini 3.5 Flash · scale prompt · first choice

Also compared

Terraform vs OpenTofu Terraform vs Pulumi The full iac standing

Comparisons are drawn for the top three products in each category. The output is the models' output; nothing here is a recommendation by the index.