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Check the official sources

Official source 1: https://developers.openai.com/api/docs/pricing
Official source 2: https://developers.openai.com/api/docs/models/gpt-6-luna
Official source 3: https://platform.claude.com/docs/en/about-claude/pricing
Official source 4: https://platform.claude.com/docs/en/models/sonnet-5-5/overview
Official source 5: https://developers.openai.com/api/docs/pricing.md

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