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How Long-Horizon Agents Kept Busting the Prompt Cache

This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.

OpenAI launched GPT-6 Sol and Luna yesterday, cutting API prices by 50% compared to GPT-5.6. Sol now sits at $2 per million input tokens and $10 for output, while Luna drops to $0.10 and $0.50. Most feeds spent yesterday debating the benchmark cards against Claude Opus 5 on AutomationBench and Deep…

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  1. 2026-09-23 16:25 · DEV Community — AI
    How Long-Horizon Agents Kept Busting the Prompt Cache

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  1. GPT-6 Sol and Luna now available on AI Gateway — Vercel Blog
  2. Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity — The Verge AI
  3. Anthropic and OpenAI roll out cheaper models in first release since call for slowdown — CNBC Technology
  4. Claude Opus 5.5 delivers Fable 5.1 performance – and costs 40% less — ZDNET AI
  5. DeepL is now available in Microsoft Copilot, ChatGPT and Claude via MCP — DeepL Blog
  6. AI slowdown? OpenAI and Anthropic launch cheaper AI models days after urging caution on frontier AI — Mint AI
  7. this is what it means when we use Codex and Claude Code to do job. — r/ClaudeAI
  8. Non-developer building a real app with Claude Code + ChatGPT. How are you guys using both without becoming the API between them? — r/ClaudeAI

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