Claude Sonnet 5 vs GPT-5.6 Terra: how they compare on coding

Merge's analysis compares two AI models, Claude Sonnet 5 by Anthropic and GPT-5.6 Terra by OpenAI, specifically for coding workflows. Released in mid-2026, both models are equipped with large context windows and are designed to handle various coding tasks such as developing service scaffolding, integration with third-party APIs, and UI building. In a direct comparison test where each model was tasked with creating a marketing homepage for a fictional company, GPT-5.6 Terra emerged as the more efficient option, completing the task faster and at a lower cost than Claude Sonnet 5, without compromising on output quality. However, the choice between the two depends on specific requirements: GPT-5.6 Terra suits speed- and cost-sensitive tasks, while Claude Sonnet 5 is preferred for complex, multi-step coding processes due to its agentic capabilities. Both models integrate seamlessly with Merge Gateway, a platform that facilitates routing coding tasks to the most suitable AI model based on user-defined criteria, offering flexibility and efficiency in managing AI-driven coding projects.

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