Claude Fable 5 vs GPT-5.6 Sol: how they compare on coding

In a detailed comparison between Anthropic's Claude Fable 5 and OpenAI's GPT-5.6 Sol, the document explores the capabilities, pricing, and performance of these two flagship AI models. Claude Fable 5, released in June 2026, is designed for complex, long-running tasks with a 1,000,000-token context window, priced at $10 per million input tokens and $50 per million output tokens. Conversely, GPT-5.6 Sol, released a month later, offers a slightly larger 1,050,000-token context window at a lower cost of $3.75 per million input tokens and $22.5 per million output tokens. Both models were tested on a coding task to build a homepage for a fictional company, revealing that while Claude Fable 5 completed the task faster and with fewer tokens, it was more expensive, whereas GPT-5.6 Sol provided a richer product story at a lower cost. The text emphasizes that Merge Gateway can be used to route tasks to the most suitable model, based on specific needs, such as cost and performance requirements.

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