AI Model Pricing in 2026: GPT-5.6, Grok 4.5, Muse Spark, and Claude Fable 5 Compared

The guide compares pricing per million tokens for GPT-5.6 Sol, Grok 4.5, Meta Muse Spark 1.1, and Claude Fable 5 across common use cases. It highlights tiered input/output token structures and context window pricing differences to help developers choose the best value.