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Anthropic and OpenAI both launched new AI models today within an hour of each other. Claude Opus 5.5 costs 40% less to run than Opus 5, with input tokens at $4 per million, while OpenAI's GPT-6 Sol and Luna cut API prices by 50% versus GPT-5.6. Both are available now.
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Summary by ByteBrief
Anthropic Proposes Independent AI Evaluators; OpenAI Agrees