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AI Development

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AI in Production

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Research

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Claude Token Counter, now with model comparisons

researchSimon Willison's Weblog4/20/2026

Changes in the system prompt between Claude Opus 4.6 and 4.7

researchSimon Willison's Weblog4/18/2026

Claude system prompts as a git timeline

researchSimon Willison's Weblog4/18/2026

Business

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