Revision History

Add Astra: OpenAI confirmed its next major model family on August 1, 2026; ship name (GPT-6 or otherwise) undecided.

Correction: the prompt cache TTL is a fixed 30 minutes rather than a minimum, and Simon Willison's cost comparison used his SVG-drawing prompt rather than an image-generation request

Add the July 30, 2026 API price cut: Luna 80 percent lower ($1.00/$6.00 to $0.20/$1.20 per 1M tokens) and Terra 20 percent lower ($2.50/$15.00 to $2.00/$12.00), Sol unchanged. New Price cut subsection with before/after table, unchanged long-context, cache-write, Batch/Flex and rate-limit rules, Fast mode replacing Priority Processing, OpenAI stated serving-cost rationale, and a verified DeepSeek V4-Flash price comparison. Dated the pre-cut Artificial Analysis, ARC Prize and Willison cost figures as launch-price measurements.

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