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TLDRocket
23 September 2026
AI’s business logic got cheaper—and more tightly controlled—today. OpenAI cut API pricing for GPT-6 Sol and GPT-6 Luna by half versus GPT-5.6 Sol, with Luna’s output-token price down 58%, and it added more default prompt caching plus a Prompt Caching Dashboard to help developers stop burning budget on repeated context. Anthropic followed with a discount for Claude Opus 5.5, lowering input from $5 to $4 per million tokens and output from $25 to $20, then warned that four common agent behaviors tied to Opus 5.5 could break in ways that surface as 400 errors—mostly around tool-choice, routing, and how conversation history is handled.
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