Anthropic
- Behind Claude Code
- Opus, Sonnet and Haiku
- A person checks the output
Claude does the planning, the hard builds and the reviews, through Claude Code. Opus for the hardest jobs, Sonnet for routine build work, Haiku for simple runs.
- 37GitHub repos with Claude Code set up
- 280+pull requests merged on this site since 22 September 2026
- 2services it belongs to
- 6tools it connects to
Why Claude gets our hard jobs
Right model, right job
Opus for the lead session when a job needs it, Sonnet for sub-agents, Haiku for simple runs.
Big jobs, split up
A lead session hands parts of a job to sub-agents, each in its own copy of the repository, then reviews what comes back.
Reviews the other agents
Claude Code reads every pull request Cursor's agents open before anything merges.
Written-down limits
Model limits sit in our agent rules, and in our operations repository a hook blocks email and publishing unless someone asked for them there and then.
Claude stays in Claude Code
Cursor's agents run Cursor's own models, so each plan covers its own work.
A person signs off
Claude writes and reasons well and still gets facts wrong, so someone checks before it ships.
Claude is the family we trust with our code, and we match the model to the job. Tokens cost money and bigger models cost more, so the biggest model only gets the work that needs it. Claude runs through Claude Code, which sits inside Cursor.
Which model for which job
- Opus: the lead session, only when a job needs it. Planning a big build, design-heavy work, anything with open questions.
- Sonnet: the most a sub-agent can use. Sub-agents build the parts of a job in their own copy of the repository.
- Haiku: simple, repeatable runs.
- Cursor's own models: Cursor's agents take the clear-cut jobs (fixes, small features, docs) on Cursor's Auto, Composer or Grok, never on Claude. Claude work stays in Claude Code.
- Gemini: sits behind some of our tools, like the TechStack Analyser.
Why the split
We pay for Claude and for Cursor separately, and some days we hit the limits on the AI tools we use. So Claude's kept for the work it does best, and none of our work depends on one tool. A subscription is a good way to manage cost, as long as your workspace can run several agents at once without losing context. The right plan depends on the person and what they do.
Where Claude runs for us
- Claude Code: plans the work, builds the hard parts, briefs Cursor's agents and reviews every pull request they open.
- Claude Desktop: laptop automation outside our client repositories.
Rules it follows
Our model limits are written into our agent rules. In our operations repository, a hook blocks email and publishing from Claude Code unless a person asks for that action there and then. A person decides what goes live.
As of 10 October 2026: 37 of the 45 repositories in our GitHub organisation have Claude Code set up, and 130+ pull requests have merged on this website's repository since 29 September 2026.
There's more on how it all fits together on our AI page. If you want the same setup for your team, have a look at AI setup.
What we connect it to
Models write and reason well, and they still get facts wrong. So a person checks anything before it leaves the building.
Claude CodeThe Claude family at work. It has its own page on how we build with it.
CursorCursor's agents run Cursor's own models, not Claude. Claude goes through Claude Code, which we run inside Cursor.
Google GeminiSits behind some of our tools, like the TechStack Analyser.
GrokOne of the models Cursor's agents run on for clear-cut jobs.
GitHubWhere pull requests from Claude Code are reviewed.
ElevenLabsClaude Haiku 5.5 is the model behind the conversation.
Services that use it
We don't sell it on its own. Each of these services uses it alongside the rest of your setup.
- Custom BuildsWhen nothing you can buy does the job, we build the missing piece and connect it to the rest. We've built and run several of these for ourselves.How it fits
- AI SetupWe install Cursor and Claude Code for you or your team, write the rules that keep them safe, and connect them to the tools you already use. You don't need to know how to code.Related tools: Cursor, Claude Code, Anthropic, GitHubHow it fits
What Anthropic is
Anthropic is the AI company that makes Claude. Its models come in tiers, and Opus, Sonnet and Haiku are the ones we use. They power the Claude chat app, Claude Code, Claude Desktop and an API for building them into other tools.
Questions about Anthropic
Straight answers on how we work, what it costs and what to expect. If yours isn't here, just ask.
Still have questions?
Talk to usWhich Claude model do you use for what?
It depends on the job. Opus for the hardest jobs, Sonnet for routine build work, Haiku for simple runs. Bigger models cost more, so we match the model to the task.
Why pay for Claude as well as Cursor?
Because they do different jobs, and some days we hit the limits on the AI tools we pay for, so none of our work should depend on just one. Cursor's agents run Cursor's own models, and Claude runs through Claude Code. A subscription is a good way to manage cost, as long as your workspace can run several agents at once without losing context. The right plans depend on the person and what they do.
Can I trust what Claude writes?
Not blindly. Claude writes and reasons well, and it still gets facts wrong. So a person checks anything before it leaves the building.
Start with your numbers.
We'll tell you which tools you need and which connections are missing.
Bring your numbers.
We'll tell you if the spend makes sense.
- A 15-minute callYour goals, your challenges, and whether we're the right fit.
- A 1-hour discovery callWe dig into your numbers. Worth a hundred emails.
- A concrete planAds, a custom build or both, as a one-off project or ongoing.
























