Technical and practical comparison between Claude Sonnet 4.6 and GPT-5.4 for real use cases: document analysis, code generation, customer service, and complex reasoning.
The most frequent question from our clients when starting an AI project remains the same: Claude or GPT? The honest answer is that it depends on the use case, but there are clear patterns we have identified after implementing more than 30 projects with both models. Claude wins at: analysis of long documents (contracts, reports, technical manuals), strict instruction following and structured output formats, tasks requiring step-by-step reasoning with detailed explanations, and any case where tone and language naturalness are critical. GPT-5.4 wins at: Microsoft/Azure ecosystem integration, combined multimodal image generation and vision, cases where you already have OpenAI investment and migration has a cost, and fine-tuning with proprietary data (OpenAI has better support for this).
In terms of pricing as of April 2026, Claude Sonnet 4.6 is approximately 20% cheaper than GPT-5.4 for the same input token volume. Latency is comparable. For most of our B2B clients in Colombia and Venezuela, Claude has consistently demonstrated better results in response quality as perceived by Spanish-speaking end users.