GPT-5.5 vs DeepSeek V4 Pro: how they compare on coding

The text compares two AI models, GPT-5.5 by OpenAI and DeepSeek V4 Pro by DeepSeek, highlighting their strengths and weaknesses based on coding performance and cost-efficiency. GPT-5.5 is a closed model known for its superior coding abilities and faster outputs, offering high-quality results at a premium price. In contrast, DeepSeek V4 Pro, with its open-weight architecture, is more cost-effective and allows self-hosting, making it ideal for high-volume and cost-sensitive coding tasks. The analysis includes a practical test where both models generated marketing homepage content, demonstrating GPT-5.5's superior quality but higher cost compared to DeepSeek's more affordable, albeit less polished, output. The Merge Gateway platform is presented as a solution for routing coding tasks to the most appropriate model based on specific requirements, providing flexibility to switch models as conditions change.

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