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

Analysis compares real cost per task across GPT-5.6 Sol, Grok 4.5, Meta Muse Spark 1.1, and Claude Fable 5. Pricing structures differ significantly with context caching and reasoning mode costs. Claude Fable 5 leads with 1M+ token context window, affecting document-heavy workflow costs.