GPT-5.6, Grok 4.5, Muse Spark 1.1, and Claude Fable 5 pricing compared

Analysis of 2026 token-based pricing for GPT-5.6 Sol, Grok 4.5, Meta Muse Spark 1.1, and Claude Fable 5. Claude Fable 5 leads with a 1M+ token context window; reasoning modes on GPT-5.6 and Claude Fable 5 cost 3-5x more per call.