A family of custom-trained security models for coding agents
Arcjet is launching a family of custom AI security models designed for analyzing AI agent activity: Arcjet Himalia 1, a general purpose prompt injection model, live today for every SDK call that uses prompt injection detection, and specialist versions designed for situations that general models handle badly, Arcjet Thebe 1 for coding agents, and Arcjet Carme 1, for autonomous security agents.
@davidmytton put it simply: "You can't detect prompt injections with a general-purpose model."
First launched here 2 months ago and loved by the community (Top Product of the Week, featured in the newsletter), @Arcjet keeps the momentum by announcing a family of custom-trained security models designed for analyzing AI agent activity:
Arcjet Himalia 1, a general-purpose prompt injection model (live now)
Arcjet Thebe 1, for coding agents (in early preview)
Arcjet Carme 1, for autonomous security agents (in early preview)
The models are compact classifiers fine-tuned from @Qwen 3-0.6B, so they return a verdict in milliseconds at a fraction of the cost of asking a frontier model.
What should @Arcjet build/improve/fix from your perspective?
About Arcjet AI security models on Product Hunt
“A family of custom-trained security models for coding agents”
Arcjet AI security models launched on Product Hunt on November 9th, 2026 and earned 238 upvotes and 39 comments, placing #4 on the daily leaderboard. Arcjet is launching a family of custom AI security models designed for analyzing AI agent activity: Arcjet Himalia 1, a general purpose prompt injection model, live today for every SDK call that uses prompt injection detection, and specialist versions designed for situations that general models handle badly, Arcjet Thebe 1 for coding agents, and Arcjet Carme 1, for autonomous security agents.
On the analytics side, Arcjet AI security models competes within Developer Tools, Artificial Intelligence and Security — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how Arcjet AI security models performed against the three products that launched closest to it on the same day.
Who hunted Arcjet AI security models?
Arcjet AI security models was hunted by fmerian. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Reviews
Arcjet AI security models has received 2 reviews on Product Hunt with an average rating of 5.00/5. Read all reviews on Product Hunt.
For a complete overview of Arcjet AI security models including community comment highlights and product details, visit the product overview.
fmerian
@davidmytton put it simply: "You can't detect prompt injections with a general-purpose model."
First launched here 2 months ago and loved by the community (Top Product of the Week, featured in the newsletter), @Arcjet keeps the momentum by announcing a family of custom-trained security models designed for analyzing AI agent activity:
Arcjet Himalia 1, a general-purpose prompt injection model (live now)
Arcjet Thebe 1, for coding agents (in early preview)
Arcjet Carme 1, for autonomous security agents (in early preview)
The models are compact classifiers fine-tuned from @Qwen 3-0.6B, so they return a verdict in milliseconds at a fraction of the cost of asking a frontier model.
More details about the benchmark
Get started at arcjet.com
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What should @Arcjet build/improve/fix from your perspective?