Building frontier model intelligence. Complete complex tasks in your codebase with clarity and control. Our coding agent is available across CLI and Cloud.
Any Codebase
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- Followers 4,646
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We are excited to announce that Cosine has assembled a landmark coalition – including BAE Systems, HSBC, BT, NatWest, and PwC – to co-design Lumen Sovereign, Britain’s first fully sovereign AI capability, backed by the UK government's @UKSovereignAI initiative.
Read more below.
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And the secret is out. 43.8% on @OpenAI SWE-Bench Verified. Learn more on the OpenAI blog!
We're launching fine-tuning for GPT-4o so you can improve performance and accuracy for your apps.
openai.com/index/gpt-4o-fine…
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o1 is here! @AlistairPullen sat down with @shyamalanadkat at the @OpenAI office to discuss how our unique techniques have unlocked new levels of performance. We teach LLMs to mimic human reasoning and benefit dramatically from new models, including o1.
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Kicking off our Launch Week, say hello to Cosine’s free plan 👋
Start building with our AI coding agent from day one – no credit card, no friction.
Get started now → cosine.sh
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Our coding agent relies on open source projects. Our partnership with OpenAI has allowed us to ship this today.
Meet AutoDoc – Cosine’s new feature that kills stale documentation.
AutoDoc was built end-to-end completely autonomously. AI building AI:
Try it free → go.cosine.sh/AutoDoc
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What if you could go from idea to live app in seconds?
Instant Sites are here.
Deploy what you build with zero waiting.
Free now → go.cosine.sh/Try-Instant-Sit…
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Cosine is the first AI software engineer powered by GPT-5.
Smarter, faster, more autonomous – with multi-agent capability fully native.
No toggles. No buttons. Just intelligent coordination for every coding task.
Get started for free → cosine.sh
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Announcing Cosine Summer Launch Week.
5 days. 5 launches. August 4th–8th.
Sign up so you don’t miss it and to be entered into our giveaway: cosine.sh/launch-week
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The most dangerous lie in engineering: “AI is just autocomplete.”
Believe it and you’ll fall behind. Teams using agents are already seeing massive leaps (52% of devs say AI boosts productivity).
Our latest blog post covers why ↓
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Build your idea, review the code, and deploy it live to share with others.
All of this takes place within a single task. Our free plan includes 80.
What would you build first?
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We're excited to announce AutoPM, a brand new way to approach larger tasks with Genie.
Scoring a record-breaking 72% on SWE-Lancer, earning $155,550
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Our new Insights dashboard allows you to see exactly where AI helped your team.
Get visibility into ROI by tracking tasks, PRs, and code changes done by Cosine.
Changelog below ↓
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Teams evaluating AI engineers for complex codebases need to consider 3 key things:
→ How much can I achieve at once?
→ How much will it cost?
→ How will it perform?
Our latest post covers Cosine and Devin:
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Building retro games with Cosine has become a bit of a pastime in the office...
Especially now you can start blank projects on platform and share in minutes.
What would you build? Get started for free → cosine.sh
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AutoPM is out now!
Working as your agentic product manager. Break down high-level software tasks, plan execution, write the code, and deliver production-ready pull requests—all autonomously.
Take a look at AutoPM in action with @AlistairPullen
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Genie 2.1 Update
Our AI software engineer just got a major upgrade. Here’s what’s new: 🧵
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We've been a little quiet this past few months, dropping something wild for you guys next week.
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You no longer need a repo to start building with AI.
Just open Cosine and click “New Project.”
No external setup. No pre-existing repo. Just code.
Get started for free → cosine.sh
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It's easier than ever to build fully functioning apps with Cosine.
Here's a gamified social habit tracker designed and deployed with just a few prompts:
ALT Fully functioning app built with Cosine called HabitTrack, a gamified social habit tracking app with daily/weekly goals, leaderboards, and level systems.
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Students: AI is reshaping the job market. 84% of devs already use it.
Get hands-on with Cosine’s enterprise-grade, agentic tool used on real codebases. Ideal for side projects and class work. Use a student email for 3 months of Professional access.
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Some of us are definitely more ready than others for our first Launch Week…
📅Aug 4th–8th
5 days. 5 launches.
$500 value giveaway for those who sign up for notifications below 👀
→ cosine.sh/launch-week
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It s a spooooooky 🎃 night of training models here in the Cosine HQ.
Our ML enginner has just published some of the techniques we're utilising to make Genie smarter.
cosine.sh/blog/ghost-in-the-…
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Cosine now plans, codes, and deploys.
Enable Instant Sites for your next front-end task.
Read the full release: go.cosine.sh/Instant-Sites-B…
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The next shift in agentic software engineering is revealed tomorrow.
9AM PT. See you there.
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Developers get full access to clean, editable code.
PMs and stakeholders get instant previews.
As easy as sharing a doc link – but for real, production-ready apps.
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We’re on a mission to make autonomous software creation accessible to everyone.
This new model removes barriers, getting you building faster than ever.
And yes… everything we launch this week is included in our free plan!
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Async isn't about working less. It's about working better.
As a SaaS startup, we believe in giving our team the space to innovate.
That’s how real progress happens.
ALT Cosine employees in the office working on Genie.
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Vibecoding is not sustainable for enterprises.
AI code without architecture, tests, or security is a risk.
Cosine is your secure solution built to scale.
Integrating with Slack, Jira, Linear, + GitHub.
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3 days to go. 3 hints to get you guessing 🤫
What do you think we’re launching?
Launch Week kicks off Aug 4th.
Sign up for notifications + giveaway: cosine.sh/launch-week
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Stop watching this demo on X, try it for free instead at cosine.sh - if you don't like it? Shout at our cofounder at yl@cosine.sh 🤫
Genie 2 drops today.
And to highlight how our fine tuning and tech stack handle any existing, legacy REAL codebase. You can prepend trygenie.now on ANY public GitHub repository to get a feel for what Genie 2 can do.
Way more features in the product at cosine.sh/genie
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Dev teams are already using AutoDoc to:
→ Onboard faster
→ Explain legacy systems
→ Improve API adoption
→ Keep docs audit-ready, effortlessly
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Most teams burn time thinking about how to build.
The best teams focus on why💡
Genie handles the execution — writing, testing, shipping — so lean teams punch above their weight. No backlog. No bottlenecks.
Watch our co-founder Yang explain ⬇️
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We believe pay-per-token pricing is on the way out.
That's why we built Genie around a pay-per-task model.
Our AI SWE agent is like a colleague. Pay for results, not token metres.
Read the full post: cosine.sh/blog/ai-coding-age…
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An incredibly capable engineer is about to join your conversations.
Tomorrow, 9AM PT.
See you then.
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Launch Week only: new users will get 100 tasks to celebrate some big news coming soon 🤫
Read the full post: go.cosine.sh/cosine-free-pla…
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GPT-5 with Cosine means you can one-shot fully functioning games in minutes.
We'd love to see what you could cook up with our free plan.
Check out Robert's game here: 166mqnj4ul09.cosine.show/
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Utilising the new Agent API's made available by @SalesforceDevs, we've created a uniquely human and direct interaction with our engineering agent.
A major upgrade to Cosine and @Slack integration is here.
Real-time collaboration – all without leaving Slack.
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Merging PRs with Genie just got an upgrade.
Faster, clearer, more controlled merges – all in one panel. All on our platform.
✅ Strategy selection
✅ Smart merge messages
✅ Inline thread resolution
✅ Real-time feedback & updates
Read more: cosine.sh/blog/smarter-pr-me…
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Every new Cosine user gets 80 free tasks to build, prototype, and explore.
Full access, zero limitations.
It’s everything Cosine can do, free to try.
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Tools aren't the future of AI. Products are.
Place your bets on cohesive engineering.
Our coding agent acts like a colleague: fixing bugs, shipping features, and opening PRs – start to finish.
Read the full post: cosine.sh/blog/product-vs-to…
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How it works:
✅ Scans with Genie, our AI model tuned for developers
✅ Generates overviews, API refs, examples
✅ Updates on every commit
✅ Fully integrated into Cosine – no context switching
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Achievement unlocked, our cofounders finally posed in front of the sign! @AlistairPullen @yangli_ @SamOfStenner
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July is nearly behind us, and we've been hard at work 💪
We're changing how teams collaborate and build with our new merge panel and enhanced Slack Integration.
Watch to the end to hear about our upcoming surprise launch week - and to see the fastest man in the AI industry 🏃♂️
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Docs always fall behind.
No one wants to stop shipping features to update READMEs.
AutoDoc fixes that. It reads your codebase and keeps your docs fresh – autonomously.
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We want to see how you're building with Genie.
Reach out via DMs or email us at genie@cosine.sh to share how your approach to dev work has shifted.
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Our CTO just got off a flight and is still able to ship from the taxi on the go.
Find out more about our integrations on cosine.sh/genie
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We believe first-party, native integrations are the future of AI systems.
Genie is built with this belief in mind:
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The next shift in agentic software engineering isn’t scheduled—it’s orchestrated. Set a reminder.
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Try out AutoDoc free on your projects.
Just turn it on, and your code starts talking.
Read the full post: cosine.sh/blog/autodoc-ai-co…
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Now it’s native and supercharged.
Cosine dynamically decides if multiple agents are needed and coordinates them behind the scenes.
You don’t configure anything. Just start building. Cosine handles the rest.
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💡For teams stretched thin, AutoPM picks up the slack.
Big backlogs, unshipped bugs, PM overhead — AutoPM gets the job done. It scopes the ticket, briefs Genie, and delivers solutions with minimal input.
Ali breaks down where AutoPM works best 👇
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June has been a busy month at Cosine!
In the wise words of our cofounder, we'll see you next month - presumably with more 😀
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AutoDoc was built using our own product.
At lunch, our cofounder asked Cosine to “build a self-updating documentation engine.”
By the afternoon, it was working and demo-ready.
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AI coding agents can be more than assistants - we built a teammate for engineering teams.
Genie operates within a custom-built IDE designed from the ground up for autonomous, AI-driven development.
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We discuss how agents read your codebase, make required repo changes, and deliver working features.
Read the post: cosine.sh/blog/dangerous-lie…
ALT The Lie About AI Engineers: From autocomplete to autonomy. Cosine blog post.
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Our cofounder @yangli_ recently spoke with @sethearley on the Early AI Podcast about the impact that AI is having on software development.
If you're curious about how AI tools like our very own Genie are reshaping the industry, give it a listen:
earley.com/insights/earley-a…
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We stepped away from the keyboards yesterday for our summer staff party ☀️
Also celebrating a successful launch week!
Here's to the next one 🥂
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AutoPM Update
Our multi-agent product manager just got a lot more flexible.
Here's how we've improved integration control: 🧵
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Now is the best time to start building with Cosine, the most capable AI coding agent.
Here's a wrap-up of our recent Summer Launch Week. Giveaway winner to be announced later this week 👀
Get ahead as a dev for free now → cosine.sh
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We sat down with @AlistairPullen to talk about AutoPM, our multi-agent innovation.
Scoring 72% on the SWE-Lancer Diamond benchmark— our AI product manager orchestrates multiple specialised Genie agents to handle complex software development tasks.
Find out why we're excited about it:
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Bug in production? Just @Genie in Slack. It’ll pick it up, fix it, and open a PR
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We believe in flat subscription models - not burdening users with token anxiety.
Our approach ensures users aren't bogged down by constantly worrying about costs as they try to implement their projects.
Say hello to Arlo as he makes his onscreen debut 👋😁
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In June, our multi-agent innovation, AutoPM, launched in research preview – planning and executing complex tasks with precision.
Power users loved it. It worked best when invisible: triaging Slack bugs, splitting up Linear tickets, and keeping devs in flow.
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We’re building Genie 2 for engineers who value structure, reliability, and real-world workflows.
Tried it? Tell us what’s working - and what’s not. Your feedback can shape what we ship next.
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🚨 Our product is outperforming teams 10x our size.
Why? We didn’t fork VS Code. We built a lean, cloud-native platform for Genie, our autonomous AI engineer.
No legacy baggage. Just state-of-the-art innovation.
Read about our approach here: go.cosine.sh/blog-vs-code
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Team collaboration is about to change.
Ready to onboard a new colleague?
Announcement Thursday 9AM PT ⏰
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One-click CI tracking is now live on Genie.
➡️See status at a glance.
➡️Drill down only when you need to.
➡️Auto-log pruning after 30 days.
Fewer clicks. Cleaner history. 👉 cosine.sh
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Take a quick tour of our new Genie 2 homepage with Tom - streamlined to get you prompting faster, working smarter, and staying in flow.
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An AI coding agent that works where you work.
Find out more → cosine.sh
ALT Genie Post-IDE Era by Cosine graphic.
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This is what sets Genie apart when it comes to large codebases, team settings, and actually shipping work that matters:
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And if you already have code?
Import from GitHub with our close integration.
Or import from any Git-based URL – GitLab, Bitbucket, your preference.
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Onboarding doesn’t have to throttle delivery.
AI coding agents learn in real time, keep docs alive, and cut “time-to-first-PR.” Teams with strong onboarding see retention jump ~82%.
See how continuous onboarding actually works ↓
cosine.sh/blog/ai-onboarding…
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Own your workflow. Move faster. Build with Cosine.
Read the full release: go.cosine.sh/start-blank-pro…
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We wanted another game.
When Genie is one-shotting our requests, there's no excuse not to show it off.
See how a single instruction brings it to life:
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With just one click, you can now see and share what you’ve built.
Just hit Deploy and your site is live.
Cosine handles everything – hosting, SSL, domains – instantly.
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Tired of stale tickets and PM overhead? So were we.
We had a task to build a run_eval script with a vLLM server and LoRA adapter. Our cofounder Ali filed it. AutoPM did the rest.
No chasing. No meetings. Just output.
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Genie just got a major homepage upgrade:
➡️ Reopen recent tasks fast
➡️ Start with images + tickets
➡️ Add context before prompting
➡️ Pick your project upfront
➡️ Unsent drafts now auto-save
➡️ And more...
Less friction. More flow. Discover here: go.cosine.sh/new-genie-homep…
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AutoPM is out now—and it's changing how our team works 💥
Last week, our dev Ben needed to troubleshoot a vLLM operation live, focusing on metrics like request throughput and concurrency.
He used AutoPM to save time and effort: 🧵
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Shaping the future of the UK's AI Policy! 🇬🇧 Kicking off @LDNTechWeek, our CTO joined key ministerial discussions on making the UK a global AI powerhouse.
We shared insights from Genie, our autonomous AI software engineer, on driving developer innovation across the industry.
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Opening a chat with Cosine in Slack creates a new task, where you can select which project you're building in and issue commands.
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Multi-agents work in parallel to bring dev-work to life, intelligently reasoning how to deliver outcome-driven results.
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Access the games here for a blast from the past:
go.cosine.sh/retro-arcade
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Imagine an AI teammate that navigates your codebase like it pays rent. No vibes, all business 👔
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Cosine were recently invited to discuss the future of AI policy in the UK during @LDNTechWeek 🇬🇧
We got a clear message: the UK wants to lead in AI.
Take a look at what was discussed:
cosine.sh/blog/cosine-shapin…
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Genie 2 is a fully autonomous, asynchronous software engineering agent.
Built for your codebase. Meeting your workflows.
We're offering a 14-day free trial on our Pro tier. Sign up below.
cosine.sh
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Your most complex dev goals are waiting to be shipped.
Cosine, with the power of GPT-5, is ready to coordinate every coding task.
Read the full breakdown: cosine.sh/blog/cosine-gpt5-m…
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Iterating on customer feedback has never been so easy.
From user emailing us to make a suggestion to shipped without lifting a finger.
All while I get on with other work.
ALT Genie 2 autonomously takes care of a coding task suggested by a customer
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See our full release notes to find out how your workflow integrations got more powerful ⬇️
Bonus: refined feature delivery with backend-served and per-user flags
cosine.sh/blog/autopm-integr…
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Turn any generated site or web asset into a live, shareable URL.
Write the code and ship. It’s that simple.
No more copying code into Vercel. No more CI pipelines.
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Got an app idea you'd rather leverage a coding agent for? Get started for free by signing up now: cosine.sh
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We presented insights from our experience with building fine tune models to solve coding tasks at the last demodays.ai
We also gave a further sneak peak of Genie.
You can now listening to @AlistairPullen share his secrets on YouTube
piped.video/zQMSq78-E28
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Blank projects are now live on Cosine.
Perfect for new ideas, fast experiments, or building from scratch – all with an autonomous AI engineer by your side.
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