OpenAI vs Anthropic (Claude) vs Google Gemini — UK AI API (2025)

Updated: January 20269 min read
🇬🇧 UK💷 GBP📊 Comparison🔒 UK GDPR⚖️ UK Law

Anthropic Claude (claude-sonnet-4-20250514) is ClickMasters' default for UK regulated applications: strongest safety characteristics, EU data residency available, most reliable for structured output and legal/clinical document analysis. OpenAI GPT-4o is right for applications where GPT-4o's reasoning or multimodal capabilities provide specific advantage. Google Gemini is right for integration with Google Workspace or Google Cloud. For NHS and FCA regulated AI applications: all three require careful data processing agreements — patient and financial data cannot be used for model training. UK AI API selection affects UK GDPR compliance, regulatory AI governance (FCA Consumer Duty, NHS DTAC Standard 4), and output quality for regulated use cases.

FactorAnthropic ClaudeOpenAI GPT-4oGoogle Gemini
EU data residency✅ EU processing availableAzure OpenAI — EU availableGCP EU region available
UK GDPR data processing✅ DPA available — no training on inputs (by default)DPA available — no training on inputs (API)DPA available — no training on inputs (API)
NHS DTAC Standard 4 (AI governance)✅ Used in NHS AI applications — model cards availableUsed in NHS AI applicationsLess common in NHS
FCA regulated use (AI models)✅ Strongest safety — FCA AI governance alignmentGood — FCA-facing FinTechs use GPT-4GCP VertexAI for enterprise FinTech
Structured output (JSON)✅ Best — tool_use JSON schema enforcementFunction calling — goodFunction calling — good
Legal / clinical document analysis✅ Best — long context (200K tokens), safetyGPT-4o 128K context — goodGemini 1.5 Pro 1M context — impressive
UK pricing (per 1M tokens)Input £2.40 Output £12 (Sonnet 4)Input £4 Output £12 (GPT-4o)Input £1 Output £3 (Gemini 1.5 Flash)
ClickMasters default✅ All UK regulated (NHS, FCA, LegalTech)Complex reasoning, multimodal tasksGoogle Workspace integration

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