AI model pricing compared: GPT-5.6, Grok 4.5, Muse Spark, Claude Fable 5

The guide from MindStudio compares pricing structures for GPT-5.6 Sol, Grok 4.5, Meta Muse Spark 1.1, and Claude Fable 5. Claude Fable 5 offers a 1M+ token context window with cache discounts. Extended reasoning modes cost 3-5x more per call.