Cosine
Cosine is a London-based AI software engineering company that builds autonomous coding agents — led by its proprietary Genie model and Lumen model family — for financial institutions, defence contractors, government agencies, and SaaS providers requiring on-premise or air-gapped deployment.
- Company typePrivate
- Founded2023
- HeadquartersSan Francisco, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Cosine does
Cosine is a London-based AI software engineering company that builds autonomous coding agents for enterprise and regulated-industry customers. Its core products include the proprietary Genie model — which achieved the highest SWE-bench score at launch in August 2024 — and the Lumen model family (Scout, Outpost, Frontier, Sovereign) post-trained from open-weight foundations such as Devstral and Kimi K2.6, with explicit specialisation for niche languages (COBOL, Fortran, Verilog, ABAP, .NET) and benchmark leadership on specialist coding tasks. The platform delivers end-to-end autonomous workflows — task planning, code generation, test execution, and pull-request submission — via CLI, desktop, and cloud surfaces, with multi-agent orchestration (Cosine Swarm) for parallel execution across repositories, plus a built-in Rust/Go search engine embedded in the CLI for ripgrep-level performance without external dependencies.
Cosine serves financial institutions, defence contractors, government agencies, and SaaS providers with complex security, compliance, and data-sovereignty requirements. Its go-to-market combines a self-serve product-led growth motion (free plan plus tiers from $19 to $999 per month, with credit-based consumption and top-ups) with an enterprise field-sales motion targeting regulated industries that require on-premise or fully air-gapped Kubernetes deployment inside the customer's security perimeter. Distribution is extended through a formal partner programme spanning technology providers, systems integrators, and resellers, plus co-marketing with the AWS Generative AI Innovation Centre. Selected enterprise deployments include a global investment bank (30% backlog cleared in month one, 45% time-to-merge reduction), a defence technology company (60% refactoring effort reduction), and a European financial institution running on-premise post-training.
The company is privately held, legally constituted as Buildt AI Limited, headquartered at 81 Rivington Street, London. Capitalisation includes a $2.5 million seed round in August 2024 from SOMA, Uphonest, Lakestar, and Focal. In April 2026, Cosine was selected as a flagship partner of the UK government's £500 million Sovereign AI programme, receiving 500,000 GPU hours on the Isambard-AI supercomputer and an option for the Sovereign AI Fund to participate in its next funding round. In June 2026, the company formed an industry coalition with HSBC, Lloyds Banking Group, NatWest, LSEG, BAE Systems, Babcock, BT Group, PwC UK, Thales UK, Leonardo UK, Telefónica Tech UK&I, and the Alan Turing Institute to co-design Lumen Sovereign, a UK-sovereign frontier AI model targeting air-gapped deployment by end of 2026.
Cosine firmographics
Firmographics- Name
- Cosine
- Legal name
- Buildt AI Limited
- Website
- https://cosine.sh
- Company type
- Private
- Founded year
- 2023
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Cosine is a London-based AI software engineering company that builds autonomous coding agents — led by its proprietary Genie model and Lumen model family — for financial institutions, defence contractors, government agencies, and SaaS providers requiring on-premise or air-gapped deployment.
- Ownership category
- akta.pro rank
Cosine industry classification
Industry- Product category
- AI Software Engineering Platform
- NAICS
- Software Publishers (5132), Software Publishers (51321)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs) (HDAEANAJ)
- akta.pro secondary industries
- AI Integration & Orchestration Platforms (Connectors, Workflow, iPaaS for AI) (HDAEANAI), Responsible AI, Security & Privacy Platforms (Safety, Guardrails, PII) (HDAEANAG)
Keywords
Where Cosine is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Cosine business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Infrastructure, Marketing or Sales, Operations
Revenue model
- SaaS Subscription (Cosine Credits): Tiered subscription plans with monthly credit allocation for cloud-based usage. Credits consumed when Cosine reads codebase, plans solutions, writes code, or runs tests. Credit top-ups available for all plans except Enterprise.
- Enterprise Licensing: Custom pricing for large-scale or regulated organisations with deployment flexibility across cloud, VPC, or on-premises hosting. Includes dedicated support and SLAs. Scales based on compute usage, model size, and concurrent tasks.
- On-Premise License: Perpetual or term-based licensing for air-gapped installations with full customer control over infrastructure. Licensing model at workspace level allowing multiple agents or teams under one contract.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | Individual plan for platform exploration |
| Subscription | Monthly | Solo developer and side project plan |
| Subscription | Monthly | Small team collaboration plan |
| Subscription | Monthly | Growing team plan |
| Subscription | Monthly | High-throughput team plan |
| Subscription | Multi-year contract | Enterprise with unlimited usage and private deployment |
Go-to-market motion3 records
Distribution channels6 records
Marketing channels5 records
Cosine product offering
Product offeringCore offering
Cosine builds autonomous AI software engineering agents that plan, write, test, and submit code changes as pull requests, powered by its proprietary Genie model and the Lumen model family. The platform is delivered through Cosine Cloud (managed SaaS), Cosine CLI (terminal interface), and enterprise deployments on VPC, on-premises, or fully air-gapped infrastructure, with specialization in niche and legacy programming languages. It targets both self-serve developers and large regulated enterprises in financial services, defence, and government that require sovereign, isolated AI coding capability.
Product overview
Cosine is an AI software engineering platform built around its Lumen model family, consisting of three specialized coding models: Scout (entry-level, on-device), Outpost (high-quality production tasks), and Frontier (advanced reasoning, in development). The company also offers Lumen Sovereign, a UK-sovereign frontier AI model for regulated industries. Core delivery surfaces include the Cosine CLI (terminal interface), Cosine Cloud (managed platform), and enterprise deployment options (VPC, on-prem, air-gapped). The platform specializes in autonomous end-to-end software engineering tasks, handling everything from task planning to PR submission. Specialized solutions include Red Team (cybersecurity), Niche Languages (legacy systems), and Sovereign AI deployment. The proprietary Genie model powers the platform, achieving state-of-the-art SWE-bench performance.
Differentiator
Problem solved
Functional benefit
Products and services
- Lumen Scout Entry-level coding model post-trained from Devstral 123B, designed to run cheaply and operate on-device for lightweight coding tasks as part of the Lumen model family.
- Lumen Outpost High-quality coding model post-trained from Kimi K2.6 for everyday production software tasks, optimized for maintainability and production-quality outputs. Achieved 59.3% on Niche-Bench benchmark.
- Lumen Sovereign Britain's proposed first sovereign frontier AI model developed in coalition with UK financial institutions, defence firms, and infrastructure operators. Designed to run exclusively on UK infrastructure without dependency on foreign providers and targeted for air-gapped deployment.
- Genie Proprietary AI software engineer model achieving state-of-the-art performance on the SWE-bench benchmark, outperforming OpenAI and comparable models. Used for post-training deployments reaching performance equivalent to OpenAI's o3 model under strict data privacy requirements.
- Cosine CLI Terminal-native interface for local-to-remote execution, external tool access via MCP, and multi-agent orchestration. Supports fuzzy and keyword search without external dependencies via built-in Rust/Go engine.
- Cosine Cloud Fully managed cloud platform enabling teams to run multiple coding tasks in parallel, plan large changes, and collaborate across engineers in shared projects, with tiered subscription plans and shared credit pools.
Quantifiable outcome
- 40% reduction in PR completion time compared to manual workflows
- +5 more outcomes
Companies that use Cosine
Customer profileNamed customers4 records
Segments5 records
Ideal customer profiles4 records
Cosine technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration10 records
AI capability6 records
Feature8 records
Cosine partnerships and signals
Strategic signalPartnerships
17 partnerships are on record, tiered core and flagship.
- HSBCcoreMajor UK financial institution joining Cosine's Lumen Sovereign coalition to co-design Britain's first sovereign frontier AI model. Part of coalition including leading banks, defence firms, and infrastructure operators targeting air-gapped deployment by end of 2026.
- Lloyds Banking GroupcoreUK retail and commercial bank joining sovereign AI coalition to co-design Lumen model for handling classified tasks for regulated industries.
- NatWest GroupcoreUK banking group participating in sovereign AI coalition to eliminate dependency on foreign AI technology and handle classified financial tasks.
- LSEG (London Stock Exchange Group)coreGlobal financial market infrastructure company joining coalition to shape sovereign AI model requirements, governance framework, and real-world applications.
- BAE SystemscoreMajor UK defence contractor participating in sovereign AI coalition for classified defence infrastructure applications.
- Babcock InternationalcoreDefence and critical infrastructure company signed MoU to shape Lumen Sovereign's technical requirements and governance framework.
- BT GroupcoreUK telecommunications provider joining coalition to co-design sovereign AI for critical national infrastructure.
- PwC UKcoreProfessional services firm joining coalition to shape sovereign AI governance and enterprise applications.
- Thales UKcoreDefence and security technology company contributing to sovereign AI design for classified applications.
- Leonardo UKcoreAerospace, defence, and security company participating in sovereign AI coalition for UK critical systems.
- Telefónica Tech UK&IcoreTechnology services provider joining coalition to help design Lumen Sovereign model and its real-world applications.
- Alan Turing InstitutecoreUK's national institute for data science and AI partnering on sovereign AI development and research.
- UK Government - Department for Science, Innovation & TechnologyflagshipGovernment selected Cosine as flagship partner in £500 million Sovereign AI programme. Awarded 500,000 GPU hours on Isambard-AI supercomputer and Sovereign AI Fund secured option to participate in Cosine's next funding round.
- NebiuscorePost-training infrastructure partner providing Papyrax multi-node training framework for customising open-source LLMs. Cosine used Nebius platform for post-training Llama 3.3 70B and GPT-OSS-120B, achieving performance equivalent to OpenAI's o3 model.
- OpenAIcoreEarly access partner for Agent Reinforcement Fine Tuning (Agent RFT) technology, achieving up to 72% performance gains and substantial reductions in tool calls and output tokens.
- AWS (Generative AI Innovation Centre)coreJoint presentation at re:Invent 2025 on multi-agent orchestration for enterprise coding agents. Partnership for enterprise deployment on AWS infrastructure.
- OpenAI (GPT-4o Fine-tuning)coreFine-tuning launch partner for GPT-4o achieving state-of-the-art results on SWE-bench benchmark.
Scale indicators10 records
Recent moves6 records
Expansion highlights6 records
Cosine competitors and assessment
Company assessmentDirect peers
- Cognition (Devin): Autonomous AI software engineer (Devin) targeting end-to-end task execution across repositories. Direct competitor in the same agentic software engineering category.
- Windsurf (Codeium): AI coding assistant with agentic IDE features and enterprise deployment options. Competes for the same developer and team-seat use case as Cosine Cloud and Cosine CLI.
- Cursor (Anysphere): AI-native code editor and coding agent product competing for the same developer mindshare, with similar IDE-integrated and agentic workflows. Closest direct competitor in autonomous coding tasks.
- Tabnine: Enterprise AI coding assistant with on-prem/air-gapped deployment options. Comparable in targeting regulated enterprises with private deployment models.
- Sourcegraph (Amp): Enterprise code intelligence platform with AI coding agents (Amp/Aiden) targeting large codebases. Comparable in serving enterprise developer productivity and understanding of large repositories.
- Magic AI: Frontier AI coding lab building autonomous software engineering agents, comparable in being a vertically integrated model + product company targeting enterprise coding workloads.
- Poolside AI: AI coding model and platform focused on autonomous software engineering for enterprise customers. Competes in the same proprietary-coding-model-for-SE-workspace category.
Broad incumbents
- Replit Agent: Cloud development platform with AI agent for autonomous code generation and application building. Overlaps on agentic software creation though positioned more at SMB/consumer builders.
- GitHub Copilot: Incumbent AI coding assistant from GitHub/Microsoft with broad enterprise distribution and agent mode. Sets the default competition Cosine must displace inside large enterprises.
Emerging players
- StackBlitz (Bolt.new): AI app-generation agent that autonomously builds full-stack applications from prompts. Comparable on autonomous code generation use case but at a different point in the dev workflow.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Cosine social profiles
Digital presenceCosine compliance and trust
Trust signalCompliance4 records
Cosine financial estimates
Financial estimateRevenue estimate
Valuation estimate
Cosine leadership team
Management profileNumber of profiles
Profiles6 records
Cosine funding detail
Funding detailFunding overview
Funding rounds4 records
Investors7 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Cosine M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Cosine
What does Cosine do?
Cosine builds autonomous AI software engineering agents that plan, write, test, and submit code changes as pull requests, powered by its proprietary Genie model and the Lumen model family. The platform is delivered through Cosine Cloud (managed SaaS), Cosine CLI (terminal interface), and enterprise deployments on VPC, on-premises, or fully air-gapped infrastructure, with specialization in niche and legacy programming languages. It targets both self-serve developers and large regulated enterprises in financial services, defence, and government that require sovereign, isolated AI coding capability.
Is Cosine a public or private company?
Cosine is a private company. It is classified as venture growth investor backed and is currently operating.
When was Cosine founded?
Cosine was founded in 2023. It employs 11 to 50 people.
Where is Cosine based?
Cosine is headquartered in San Francisco, United States, in the North America region.
How does Cosine make money?
Three revenue lines are on record. SaaS Subscription (Cosine Credits) is the primary driver. The others are enterprise Licensing and on-Premise License.
Who are Cosine's main competitors?
Direct peers on record are Cognition (Devin), Windsurf (Codeium), Cursor (Anysphere), Tabnine, Sourcegraph (Amp), Magic AI and Poolside AI. Broad incumbents are Replit Agent and GitHub Copilot. StackBlitz (Bolt.new) is listed as an emerging player.
Does Cosine have an API?
No public API is recorded for Cosine.
What industry is Cosine in?
Cosine's product category is AI Software Engineering Platform. Its primary akta.pro industry code is HDAEANAJ, AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs), with a secondary code of HDAEANAI, AI Integration & Orchestration Platforms (Connectors, Workflow, iPaaS for AI). Its NAICS code is 5132 and its SIC code is 7372.