6,622 tools, each one opened, scored and signed by a Toolio reviewer

Build T AI

Cosine trains AI models to write production-quality code.

Checked 3 Oct 2026 Reviewed by Alex Listed since August 2024

Screenshot of Build T AI

At a glance

Starts at from $19 per month Price as published by the vendor, September 2026.
Free tier No
Platforms Web, macOS, Windows
Best for Developers and teams building complex software.
Not for Python and javascript developers

3.9 out of 5

Scored by Alex after real use

Our verdict

Cosine excels in training specialised coding agents for secure environments. It's best suited for those needing exceptional maintainable code, but may be overkill for simpler projects or generalists.

✓What it does well

Specialised ModelsTrained exclusively on real production code from engineering teams.
Cross-Platform SupportWorks within a terminal-native interface and cloud solutions.
Customisable PricingFlexible plans starting at $19/month with add-on credits available.

✕Where it falls short

Limited to Niche LanguagesDoes not support mainstream languages like Python or JavaScript out of the box.
Air-Gapped Deployment ComplexityFits only air-gapped environments, which can be complex and costly to set up.
No Free TierAll plans start at $19/month with limited free credits for solo developers and side projects.

Key features

Air-Gapped SupportAvailable in fully air-gapped deployments.
Comprehensive Credit SystemCredits cover agent work, model calls, and cloud execution.
Red Team TrainingComing soon for security-focused training models.
Mainstream Language SupportSupport for popular languages like Python and JavaScript

Questions about Build T AI

What is Build T AI?

Build T AI is presented under the name Cosine, which trains AI models to write production-quality code. Its specialised models are trained exclusively on real production code from engineering teams, and the reviewer says it excels at training specialised coding agents for secure environments.

How much does Build T AI cost?

Build T AI starts from $19 per month and has no free tier, though the reviewer mentions limited free credits for solo developers and side projects. Its credit system covers agent work, model calls and cloud execution, and add-on credits are available.

What platforms does Build T AI support?

Build T AI runs on the web, macOS and Windows. The reviewer notes it works within a terminal-native interface as well as cloud solutions, and it is also available in fully air-gapped deployments, though setting those up can be complex and costly.

Who is Build T AI for?

Build T AI is best for developers and teams building complex software who need maintainable code. The reviewer warns it may be overkill for simpler projects or generalists, and Toolio lists it as not for Python and JavaScript developers.

How does Toolio score Build T AI?

Alex gave Build T AI a Toolio score of 3.9 out of 5 on 3 Oct 2026 after real use. It has been listed on Toolio since August 2024, and red team training for security-focused models is listed as coming soon.

COMPARE