AI Update Overview: Opus 5.5, Fable 5.1, GPT-6, DeepSeek, and Grok

Over the past five weeks, the generative AI market has seen significant shifts with the release of new models, including Claude Fable 5.1, Opus 5.5, and Sonnet 5.5, the GPT-6 lineup (Astra, Sol, Luna, GPT-6.1), as well as updates to Grok 4.7 and DeepSeek V4.1 Flash. This article provides a detailed comparative analysis, current as of October 3, 2026. The author has systematized data on API and subscription pricing and conducted independent speed benchmarks. The material clearly demonstrates the time and financial resources required to perform identical tasks across various platforms. This overview helps developers and users navigate the rapidly evolving landscape of AI tools, enabling them to choose the most effective solution in terms of performance and cost-efficiency.