Home Tips & Tricks ClaudeInterpretation of New Features in the Claude 4 Series: Extended Thinking, File API, and Prompt Caching

Interpretation of New Features in the Claude 4 Series: Extended Thinking, File API, and Prompt Caching

2/18/2026

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Claude 4 Series Model Upgrade: Stronger Programming and a More Stable Reasoning Rhythm Claude 4 includes Claude Opus

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