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OpenAI launches GPT 5.6 Sol/Terra/Luna
**OpenAI** launched the **GPT-5.6** family with three models: **Sol**, **Terra**, and **Luna**, integrated across **ChatGPT**, **Codex**, and the API. Pricing tiers range from **$1 to $5 per million tokens** with new cache-write pricing and a 90% cache-read discount. The launch includes new app features like **ChatGPT