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Anthropic debuts Claude Sonnet 5.5 as OpenAI releases Sol and Luna reasoning tiers

Summary

Anthropic releases Claude Sonnet 5.5 with reduced tool overhead while OpenAI introduces ChatGPT-6 Sol and Luna reasoning tiers and publishes safety case methods.

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TweeLabs AI News·Published 29 September 2026·1 min read·8 words

Anthropic debuts Claude Sonnet 5.5 as OpenAI releases Sol and Luna reasoning tiers

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