Cosine
Verified Oct 2, 2026 ActiveAI coding agent for terminal, cloud and desktop, backed by its own coding models and air-gapped deployments for regulated teams.
Listed on EffectHub ·
Pricing
- Pricing model
- Paid
- Paid options from
- $19/mo
- Billing
- Monthly
Plans are credit pools: Starter $19 a month (4M credits), then tiers up to Team $199 (47M) and Enterprise $999 (240M) on the pricing page, with add-on credits from $6.50 down to $4.50 per million. Different models burn credits at different rates; air-gapped and private deployments are quoted by sales.
Use tool ↗About Cosine
Cosine is a coding agent that takes engineering tasks from a terminal CLI, a cloud workspace where several tasks run in parallel, or a desktop app, and returns commits and pull requests. It runs on the company's own Lumen coding models, post-trained from open models such as Devstral and Kimi, and on third-party models too. The vendor's pitch is deployment inside strict environments: managed single-tenant cloud or fully air-gapped installs for banks, healthcare and defence, plus support for niche languages like COBOL and Verilog. It is made by the London company Buildt AI Limited, which trades as Cosine.
- API
- No
- Last verified
- Oct 2, 2026
Verified sources
- Product surfaces, Lumen models, deployment options and benchmarkscosine.sh ↗
- Credit-based plan prices and add-on credit ratescosine.sh ↗
- Operating company Buildt AI Limited, London, trading as Cosinecosine.sh ↗
- UK-based lab history from 2022 and move to air-gapped deploymentscosine.sh ↗
- Plan ladder and one account across Cloud, CLI and Desktopdocs.cosine.sh ↗
Is Cosine legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Last checked
- Oct 2, 2026The site answered
- On the market since
- 2022The vendor's own material, read by us
- Operated by
- Buildt AI Limited (Cosine), United KingdomOur research, card verified Oct 2, 2026
Pros & cons of Cosine
Cosine is aimed at organisations that cannot send code to a public cloud and want a coding agent plus a model trained for their stack, which few competitors offer. Individual developers can start on a $19 plan, but the product's differentiation is in sovereign and air-gapped setups. If you only want an inline editor assistant, other tools are simpler.
Pros
- Runs from a CLI, a cloud workspace and a desktop app under one account and credit pool
- Own Lumen models, with cheaper Scout and heavier Outpost tiers
- Single-tenant and fully air-gapped deployment options
- Self-serve plans start at $19 a month with published credit allowances
Cons
- Credit consumption varies by model, which makes monthly cost hard to predict
- Smaller ecosystem and community than the large coding assistants
- Enterprise and private-deployment pricing is not public
Best for
- Banks, defence and healthcare engineering teams that need an on-premises or air-gapped coding agent
- Teams maintaining legacy or niche-language code such as COBOL, Fortran or Verilog
- Developers who want a terminal-first agent with parallel cloud tasks
Not for
- Developers who just want autocomplete inside an existing editor
- Buyers who need published pricing for private deployments
Watch out: The company has repositioned itself as a sovereign AI lab, so older descriptions of Cosine as a plain AI software engineer or its earlier Genie model are out of date; credits, not tasks, are what you are billed on.
Top alternatives to Cosine
Amazon Q Developer69AWS's coding and operations assistant for IDEs, the terminal and the console, with its IDE plugins now on an end-of-support clock.Not rated yetFrom $19/seat/moCosine head-to-head
Side-by-side fact sheets against the competitors our research or their makers name — pricing, platforms, API and both verdicts on one page.
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