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CI/CD platforms · October 2026 Edition

GitHub Actions vs CircleCI

Ten of fourteen models named GitHub Actions first on the direct prompt; one named CircleCI. Both were named by all fourteen models and GitHub Actions carries 68 labels and CircleCI 64, so the shares are not directly comparable.

GitHub Actions

endorsed leader

Named in one category this edition.

CircleCI

accepted challenger

Named in two categories this edition.

First-choice share68%4%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.

Negative rate7%19%Negative labels as a share of the product's labels, 0 to 100.

Rank in category#1#3A position in a field of 10; printed, not drawn.

Labels6864A count; the two differ.

The two percentage rows are drawn on one 0 to 100 track, GitHub Actions reading right to left. Rank and label count are printed, not drawn.GitLab CI/CD was named alongside these two in eleven of the fourteen direct answers. GitHub Actions vs GitLab CI/CD · GitHub Actions vs Buildkite · GitLab CI/CD vs CircleCI

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen 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 CI/CD platforms page.

By framing

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

GitHub ActionsFirst choices, of fourteen modelsCircleCI

Direct1012 against CircleCI

Paraphrase801 against CircleCI

Comparative110

Budget-constrained1412 against CircleCI

Scale-constrained602 against CircleCI

Negative005 against GitHub Actions · 5 against CircleCI

Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.

Across every category in the October 2026 Edition, GitHub Actions and CircleCI were named in the same answer 159 times, of the 210 answers naming GitHub Actions and the 177 naming CircleCI. In those answers CircleCI took the first choice zero times and GitHub Actions 105.

Every model, every framing

The eighty-four answers behind the chart above, one cell each: where GitHub Actions and CircleCI stood in it.

Model	Direct	Paraphrase	Comparative	Budget-constrained	Scale-constrained	Negative
Claude Haiku 4.5
GPT-5.4 mini
Gemini 3.5 Flash
Perplexity Sonar
Grok 4.20
Mistral Small
DeepSeek V4 Flash
Llama 4 Maverick
Qwen 3.7 Flash
Kimi K2
GLM 4.7 FlashX
MiniMax M2.5
GPT-6 Luna
Muse Glimmer 30B

GitHub Actions

CircleCI

first choice

named as an alternative

argued againstblank: not namedEach cell is one answer, GitHub Actions on the left and CircleCI on the right.

The direct prompt

The plain question, one answer per model, grouped by where GitHub Actions and CircleCI stood in it.

GitHub Actions first, CircleCI an alternative

10 of 14 modelsCircleCI was named in the answer but not as the choice, or not at all.

GPT-5.4 miniGitHub Actions alternatives: Azure Pipelines, CircleCI

Gemini 3.5 FlashGitHub Actions alternatives: Argo CD, GitLab CI/CD, Harness

Grok 4.20GitHub Actions alternatives: CircleCI, GitLab CI/CD

DeepSeek V4 FlashGitHub Actions alternatives: GitLab CI/CD

Qwen 3.7 FlashGitHub Actions alternatives: GitLab CI/CD

Kimi K2GitHub Actions alternatives: CircleCI, GitLab CI/CD

GLM 4.7 FlashXGitHub Actions alternatives: Azure Pipelines, CircleCI, GitLab CI/CD

MiniMax M2.5GitHub Actions alternatives: CircleCI, GitLab CI/CD

GPT-6 LunaGitHub Actions alternatives: Buildkite, CircleCI, GitLab CI/CD

Muse Glimmer 30BGitHub Actions alternatives: GitLab CI/CD

CircleCI first, GitHub Actions not the choice

1 of 14 modelsGitHub Actions was named in the answer but not as the choice, or not at all.

Mistral SmallCircleCI, GitLab CI/CD alternatives: Buildkite, JetBrains TeamCity

Neither was the first choice, one was named

1 of 14 modelsThe answer put something else first and named one of the two as an alternative.

Perplexity SonarGitLab CI/CD alternatives: GitHub Actions

Neither was named

2 of 14 modelsThe answer made no first choice from these two in this category.

Claude Haiku 4.5no first choice

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

GitHub Actions leads by seventy points.

GitHub Actions#1 of 9

CircleCI#3 of 9

The full small business standing →

Mid-marketThe figures above

GitHub Actions leads by sixty-four points.

GitHub Actions#1 of 10

CircleCI#3 of 10

The full mid-market standing →

Enterprise

GitHub Actions leads by nineteen points.

GitHub Actions#2 of 12

CircleCI#12 of 12

The full enterprise standing →

What the models said about GitHub Actions

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

“GitHub Actions workflows that trust third-party actions or pull-request code too much” GPT-6 Luna · negative prompt · soft negative

“This is currently the easiest place to start, but it can become the most expensive.” Qwen 3.7 Flash · negative prompt · soft negative

“Moderate Caution: GitHub Actions ... Common misconfigs in public pipelines” Grok 4.20 · negative prompt · soft negative

“"GitHub Actions is the right default for the vast majority of teams in 2026, and it's where I'd start unless you have a specific reason not to."” Muse Glimmer 30B · budget prompt · first choice

“If teams are already on GitHub, GitHub Actions is the de facto default: bundled with GitHub Enterprise, 20,000+ marketplace actions.” Muse Glimmer 30B · scale prompt · first choice

“GitHub Actions | Teams already on GitHub Enterprise | Native integration, 20,000+ marketplace actions, SOC 2 certified” Kimi K2 · scale prompt · first choice

What the models said about CircleCI

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

“most companies have migrated to GitHub Actions to avoid paying for two separate platform subscriptions” Gemini 3.5 Flash · direct prompt · soft negative

“solid standalone CI tool, but it's CI-focused (not full CD) and has faced pricing pressure” DeepSeek V4 Flash · paraphrase prompt · soft negative

“Best for: Speed-critical builds, though free tier is more limited than competitors” Kimi K2 · budget prompt · soft negative

“GitHub Actions or CircleCI are the best starting points due to their generous free tiers and ease of use” Mistral Small · budget prompt · first choice

“CircleCI or GitLab CI are the best CI/CD platforms due to their balance of features, scalability, and cost” Mistral Small · direct prompt · first choice

“CircleCI if its execution environments, concurrency, or existing workflows are a particularly good match.” GPT-6 Luna · direct prompt · alternative

Also compared

GitHub Actions vs GitLab CI/CD GitHub Actions vs Buildkite GitLab CI/CD vs CircleCI CircleCI vs Buildkite All six head-to-head pages and the full CI/CD standing

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