Three of the leading AI labs have moved almost simultaneously to loosen usage limits and lower costs on their newest coding models, intensifying a summer contest to win over software builders. Within days of one another in mid-July 2026, Anthropic extended expanded access to its Claude Fable 5 model, OpenAI relaxed usage caps on GPT-5.6 Sol, and xAI released its Grok Build coding agent as open source, setting up an unusually favorable moment for developers weighing which frontier model to adopt.
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