https://www.developersdigest.tech/blog/gpt-6-1-sol-release-guide-2026 Developers Digest en 2026-09-29T00:00:00.000Z GPT-6.1 Sol Release Guide: Near-Astra Agentic Work at $2/$10 and $0.10 Cache Reads News, AI Models, GPT-6, OpenAI, Pricing, Codex