{"id":656,"date":"2026-07-07T10:23:33","date_gmt":"2026-07-07T10:23:33","guid":{"rendered":"https:\/\/foundry-5.com\/resources\/?p=656"},"modified":"2026-07-16T12:39:20","modified_gmt":"2026-07-16T12:39:20","slug":"the-real-cost-of-building-an-ai-product-in-the-uk-2026-numbers","status":"publish","type":"post","link":"https:\/\/foundry-5.com\/resources\/the-real-cost-of-building-an-ai-product-in-the-uk-2026-numbers\/","title":{"rendered":"The Real Cost of Building an AI Product in the UK (2026 Numbers)"},"content":{"rendered":"<p><b>Table of Contents<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Why AI budgets in the UK spiral before the first line of code<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">What does it actually cost to build an AI product in the UK in 2026?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Where the money really goes: the six cost drivers<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">How much of the budget is the AI model itself?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">How much does an AI MVP cost in the UK?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Build in-house or hire AI development services for startups?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">How long does it take to build an AI product in the UK?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When you should not build an AI product yet<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">How to brief an AI development project so the quote is real<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frequently Asked Questions<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Conclusion: price the smallest product that proves the idea<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><b>Quick answer:<\/b><span style=\"font-weight: 400;\"> Foundry 5 puts the real cost of building an AI product in the UK in 2026 at roughly \u00a340,000 to \u00a3120,000 for a well-scoped first version, with most of the money going to engineering time rather than the AI model itself. Scope drives the number, not hype: Gartner predicts at least 30% of generative AI projects are abandoned after proof of concept, almost always over scope creep, not the technology.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">You have a board deck that promises an AI feature, three competitor screenshots, and a quote from a developer that came in twice what you expected. You also have a runway that shrinks every month. The cost of building an AI product in the UK sits right on that pressure point: quote too low and the build stalls halfway, quote too high and the project never gets approved.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Here is the uncomfortable part: most founders are not overpaying for AI. They are overpaying for scope they did not need. The model is cheaper than it has ever been. The engineering around it is where the budget goes, and that is the part nobody quotes honestly on a first call.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">This article breaks down the real 2026 numbers: what an AI product actually costs in the UK, where every pound goes, how long it takes, and how to brief the work so the quote you get back means something. No vague ranges pulled from thin air. Real cost drivers, honest trade-offs, and the one question that separates a \u00a340,000 build from a \u00a3400,000 one.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>Why AI budgets in the UK spiral before the first line of code<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Most AI budgets do not blow up during development. They blow up during scoping, when a two-feature idea quietly becomes a ten-feature platform. A London founder asks for a chatbot that answers support questions. Six weeks later the spec includes live agent handoff, a custom dashboard, multilingual output, and a fine-tuned model nobody needed. The number tripled and the product has not shipped.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">This is the quiet crisis playing out across UK startups every quarter: technically capable builds that miss the point of the business. The stakes are real. When a proof of concept impresses the room, the temptation is to widen it rather than ship it. That instinct is expensive.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.gartner.com\/en\/newsroom\/press-releases\/2024-07-29-gartner-predicts-30-percent-of-generative-ai-projects-will-be-abandoned-after-proof-of-concept-by-end-of-2025\" target=\"_blank\" rel=\"noopener\"><b>Gartner predicts at least 30% of generative AI projects will be abandoned after proof of concept<\/b><\/a><span style=\"font-weight: 400;\"> by the end of 2025, citing escalating costs, poor data quality, and unclear business value. Read that carefully: the failure point is not the model. It is the gap between an impressive demo and a scoped, shippable product. The cost problem is a scoping problem wearing a technology costume.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Picture a pre-seed company that budgets \u00a330,000 for an AI feature, then approves change after change until the invoice reads \u00a395,000. Nothing was mismanaged. The scope was never fixed. The best AI teams stop this on day one by pricing the smallest product that proves the idea, rather than the largest product the founder can imagine.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>What does it actually cost to build an AI product in the UK in 2026?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The cost of building an AI product in the UK in 2026 typically runs \u00a340,000 to \u00a3120,000 for a well-scoped first version, in Foundry 5&#8217;s experience quoting UK startups and SMEs. Simple single-feature builds start lower, around \u00a325,000. Complex, data-heavy or regulated products push past \u00a3150,000. The band you land in depends on scope, not on how advanced the AI sounds.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Break the range into three honest tiers. A single AI feature bolted onto an existing product, a support copilot or a document summariser, sits at \u00a325,000 to \u00a350,000. A standalone AI product with its own interface, accounts, and a real data pipeline runs \u00a350,000 to \u00a3120,000. Anything touching payments, health data, or financial regulation starts at \u00a3120,000 and climbs with the compliance burden.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Notice what moves the number. Not the choice of model. The count of screens, integrations, user roles, and edge cases you ask the system to handle. A startup that insists on three user types and five integrations pays for three user types and five integrations, whatever the AI does underneath.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Consider two London startups with the same \u00a360,000 budget. One scopes a single AI workflow that saves its users an hour a day and ships in ten weeks. The other spreads the same money across four half-built features and ships nothing users trust. Same budget. Opposite outcome. Scope discipline is the difference, not spend.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>Where the money really goes: the six cost drivers<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">An AI product invoice is mostly people, not compute. Roughly 60% to 75% of a UK AI build is engineering and design time. The rest splits across data work, model and infrastructure costs, testing, and post-launch support. Understand the six drivers and you can predict the number before anyone sends a quote.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The first driver is discovery and scoping: the week or two that turns a vague idea into a fixed spec. Skip it and every later stage runs over. The second is design: research-driven UI and UX usually accounts for 15% to 25% of a build, because an AI feature nobody understands gets abandoned regardless of how clever it is.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The third and largest driver is engineering. UK rates are the reason the number is what it is. The median UK software developer contractor bills around \u00a3505 a day, according to <\/span><a href=\"https:\/\/www.itjobswatch.co.uk\/contracts\/uk\/software%20developer.do\" target=\"_blank\" rel=\"noopener\"><b>IT Jobs Watch contractor market data<\/b><\/a><span style=\"font-weight: 400;\">, and senior AI engineers in London command \u00a3700 to \u00a31,000 a day. A ten-week build with two engineers is not padded. It is simply what UK engineering time costs.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The fourth driver is data: cleaning, structuring, and connecting the information the AI needs to be useful. The fifth is evaluation and guardrails, the testing layer that stops the model saying something wrong in front of a customer. The sixth is post-launch support, typically 20% to 30% of the build cost per year for hosting, monitoring, and iteration. Treat that last one as infrastructure, not an afterthought. An AI product is a system you run, not an artifact you hang on the wall.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>How much of the budget is the AI model itself?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The model is the cheapest part of the cost of building an AI product in the UK, often under 10% of the total. Foundry 5 routinely builds production features where monthly model costs run to tens of pounds, not thousands. The price of raw intelligence has collapsed, and it keeps falling.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">According to the <\/span><a href=\"https:\/\/hai.stanford.edu\/ai-index\/2025-ai-index-report\/research-and-development\" target=\"_blank\" rel=\"noopener\"><b>Stanford HAI 2025 AI Index Report<\/b><\/a><span style=\"font-weight: 400;\">, the cost of querying a model at GPT-3.5 level fell from $20.00 per million tokens in late 2022 to $0.07 by October 2024: a drop of more than 280 times in about eighteen months. The economics that made AI features look unaffordable in 2023 no longer exist.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">So why do quotes still run into six figures? Because you are not paying for tokens. You are paying for the engineering that makes those tokens safe, accurate, and connected to your business. Retrieval, guardrails, evaluation, and monitoring are the real line items. The model is a commodity. The system around it is the product.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">This reframes the whole build. Do not choose a partner on who claims the fanciest model. The best AI teams treat the model as interchangeable and spend their effort on the data pipeline and the evaluation layer, rather than chasing whichever model topped a benchmark last month. Ask where a quote puts its hours. If most of it is model tuning, be careful. If most of it is data and testing, that is a team that has shipped before.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>How much does an AI MVP cost in the UK?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A focused AI MVP in the UK typically costs \u00a340,000 to \u00a380,000 and ships in eight to fourteen weeks, in Foundry 5&#8217;s experience building first products for startups. The goal of an MVP is not a finished product. It is proof: one AI workflow, real users, and evidence the idea works before you spend the rest of the runway.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The founders who ask <\/span><a href=\"https:\/\/foundry-5.com\/services\/ai-development\"><b>how much an MVP costs in the UK<\/b><\/a><span style=\"font-weight: 400;\"> are usually asking the wrong version of the question. The right question is: what is the smallest AI feature that would prove a real user pays for this? Answer that and the budget answers itself. A tighter scope is a cheaper MVP, and a cheaper MVP is a faster answer.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The common mistake is treating an MVP as a small version of everything. It is not. It is a complete version of one thing. A startup that builds one AI feature to a high standard learns more than a startup that builds five features to a rough standard, and it spends half as much doing it.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Consider a founder with \u00a350,000 and a hunch that AI could automate their client onboarding. Spent across the whole product, \u00a350,000 buys a thin, unconvincing layer. Spent on one automated onboarding flow that genuinely saves an hour per client, it buys proof, a demo, and something an investor can see working. Same money. The scope decides whether it was worth it.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>Build in-house or hire AI development services for startups?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Hiring <\/span><a href=\"https:\/\/foundry-5.com\/services\/ai-development\"><b>AI development services for startups<\/b><\/a><span style=\"font-weight: 400;\"> usually beats building an in-house team for a first product, on both cost and speed. A single senior AI engineer in London costs \u00a390,000 to \u00a3130,000 a year fully loaded, and you need at least two plus a designer to ship. A studio gives you that team for the length of the build, then you stop paying when the work is done.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The maths is straightforward. Consider a startup that hires two AI engineers and a designer in-house to build one product. That is nine to twelve months of salary, recruitment, and management before anything ships, easily \u00a3250,000 committed to an idea that is still unproven. The same product built by <\/span><a href=\"https:\/\/foundry-5.com\/services\/ai-development\"><b>AI development for startups<\/b><\/a><span style=\"font-weight: 400;\"> specialists costs a fraction of that and ships in a quarter, because the team has built the pattern before.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">This is not about in-house teams being inferior. It is about matching the operating model to the stage. An in-house team makes sense once you have a proven product and a roadmap that justifies permanent salaries. Before that point, a studio absorbs the risk you cannot yet afford to carry. Both have their place. The mistake is hiring a permanent team to answer a question a project team could answer faster.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">The best partners do more than write code: they challenge the scope before a single line is written, rather than billing for whatever you ask. Working with <\/span><a href=\"https:\/\/foundry-5.com\/\"><b>an AI development studio in London<\/b><\/a><span style=\"font-weight: 400;\"> also means the team understands UK data rules, UK budgets, and the pace a startup actually moves at, instead of learning it on your invoice.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>How long does it take to build an AI product in the UK?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A well-scoped AI product in the UK takes eight to sixteen weeks to reach a usable first version, in Foundry 5&#8217;s build experience. Simple single-feature tools land near the eight-week mark. Products with custom data pipelines, multiple user roles, or compliance requirements stretch toward sixteen weeks and beyond. Timeline tracks scope as tightly as budget does.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Break it into phases. Discovery and scoping take one to two weeks. Design takes two to three. The core build runs four to eight weeks. Evaluation, guardrails, and launch prep take the final two to three. Rush any phase and the time reappears later, usually during testing, usually at a worse moment.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">AI-assisted development genuinely compresses this. Modern tooling trims greenfield build time by a real margin, often trimming the core engineering phase by roughly a third. That is faster delivery, not lower quality, as long as the evaluation phase stays intact. Speed comes from better tools and tighter scope, never from skipping the testing that keeps the product safe.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Watch for teams that promise a full AI product in three weeks. That timeline is real only if the scope is tiny or the testing is missing. A launch is not the finish line. It is the start of the feedback loop that turns a first version into a product people rely on.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>When you should not build an AI product yet<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sometimes the honest answer is: not yet. If you cannot name the one task the AI will do, the one user who needs it, and the way you will measure success, you are not ready to spend on a build. Scoping a product you cannot yet describe is how budgets reach six figures and produce nothing.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Be honest about your data too. AI is only as useful as the information it works with. A company with messy, scattered, or thin data pays twice: once to build the product, once to fix the data that should have come first. In that case the smart first spend is data work, not a model.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">There is a real exception. If you are racing a competitor to a market window and a rough AI feature buys you position, moving fast can be worth the mess. But be clear that is the trade you are making. You are buying speed and paying in rework. That is a strategy, not an accident, and it only works when you know you are doing it.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>How to brief an AI development project so the quote is real<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A vague brief produces a vague quote, and a vague quote is how a \u00a340,000 build becomes a \u00a3120,000 argument. The teams that get accurate numbers back are the ones that scope tightly before asking. <\/span><a href=\"https:\/\/foundry-5.com\/services\/ai-development\"><b>Briefing an AI development project<\/b><\/a><span style=\"font-weight: 400;\"> well is the single cheapest way to control what it costs.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Put five things in the brief before you ask for a price. Name the one core problem the AI solves. Name the single user who feels that problem most. Describe the data you already have and be honest about its state. Define what success looks like in a number. And state your real budget, so the team scopes to it rather than around it.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Then ask the partner five questions on the first call: How do you scope discovery? Where do most of your build hours go? How do you handle changes to scope mid-build? What does testing and evaluation cover? And what happens after launch? The answers reveal how a team works faster than any portfolio ever will.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Demand specifics in return. A real quote breaks the number into discovery, design, engineering, testing, and support, rather than one lump sum with no seams. If a partner cannot show you where the money goes, they cannot promise where it will stop. The quote is only as trustworthy as the brief that produced it.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Want a real number for your AI product?<\/b><span style=\"font-weight: 400;\"> If you can name the one problem, the one user, and the budget, Foundry 5 can scope it in a 30-minute discovery call.<\/span><a href=\"https:\/\/foundry-5.com\/contact\"> <b>Book a free discovery call<\/b><\/a><span style=\"font-weight: 400;\"> no pitch deck, no commitment, just an honest range.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>Frequently Asked Questions<\/b><\/h3>\n<h4><b>What is the real cost of building an AI product in the UK in 2026?<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Foundry 5 puts the cost of building an AI product in the UK at \u00a340,000 to \u00a3120,000 for a well-scoped first version in 2026. Simple single-feature builds start near \u00a325,000, and regulated or data-heavy products pass \u00a3150,000. Scope, not the AI model, decides where you land in that range.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4><b>How much does an AI MVP cost in the UK?<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">A focused AI MVP in the UK typically costs \u00a340,000 to \u00a380,000 and ships in eight to fourteen weeks. The price depends on how tightly you scope it. One complete AI workflow costs far less than five half-built features, and it proves the idea faster, which is the entire point of an MVP.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4><b>How long does it take to build an AI product in the UK?<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">A well-scoped AI product in the UK takes eight to sixteen weeks to reach a usable first version. Single-feature tools land near eight weeks, while products with custom data pipelines or compliance needs stretch toward sixteen. AI-assisted development can trim the core build by roughly a third without cutting the testing that keeps it safe.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4><b>Why is the AI model such a small part of the cost?<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Because raw model cost has collapsed. Querying a GPT-3.5-level model fell from $20.00 to $0.07 per million tokens between 2022 and 2024, per the Stanford AI Index. You pay for the engineering around the model, retrieval, guardrails, evaluation, and monitoring, rather than for the tokens themselves. The system is the product; the model is a commodity.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4><b>Should a startup hire AI development services or build in-house?<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">For a first product, AI development services for startups usually beat building in-house on cost and speed. A permanent AI team means \u00a3250,000-plus committed before anything ships, while a studio delivers the same product in a quarter and you stop paying when it is done. Build an in-house team once the product is proven, not before.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3><b>Conclusion: price the smallest product that proves the idea<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The cost of building an AI product in the UK is not really a technology question, and Foundry 5 treats it as a scoping one first. The model is cheap. The engineering is honest work at honest UK rates. The budget spirals only when scope does, and scope is the one thing you fully control.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">So do the discipline before the spend. Name the one problem. Name the one user. Fix the scope. Then price the smallest product that proves the idea, rather than the largest one you can picture. That is how a \u00a340,000 build stays a \u00a340,000 build.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">If you are ready to put a real number on your AI product, <\/span><a href=\"https:\/\/foundry-5.com\/contact\"><b>book a free 30-minute discovery call with Foundry 5<\/b><\/a><span style=\"font-weight: 400;\">. No pitch deck. No pressure. Just an honest range and a clear next step.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\"><b>Build the smallest thing that proves it works.<\/b><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents Why AI budgets in the UK spiral before the first line of code What does it actually cost to build an AI product in the UK in 2026? Where the money really goes: the six cost drivers How much of the budget is the AI model itself? How much does an AI [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":657,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cost of Building an AI Product in the UK (2026)<\/title>\n<meta name=\"description\" content=\"What does building an AI product in the UK really cost in 2026? 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