Open Source · Anthropic · Microsoft · AI Agent · Claude · GitHub · Decrypt
Developer Who Cloned Photoshop With AI Just Did the Same to Microsoft Office
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★ Tier-1 Source
You have two options: Pay $100 every year for Microsoft Office online, or pay nothing for the vibe-coded “Office” clone that does the same and runs fully offline.
Key facts
- The model behind ArtCraft, Claude Opus 5.5, launched September 22 at $4 per million input tokens and $20 per million output tokens; tokens are the chunks of text an AI reads and writes, and the unit
- Microsoft charges $99.99 a year for Microsoft 365 Personal and $129.99 for the family plan, which is how most households get Word and Excel today
- On Terminal-Bench 4.0, which tests whether an AI agent can finish complex professional tasks in a command-line environment and scores the share of tasks completed, Opus 5.5 hit 66.4%
- GridCraft, the Excel clone, already handles 513 of Excel's 523 worksheet functions, the formulas like SUM or VLOOKUP that make spreadsheets do math, plus 89% of its ribbon commands
Summary
Developer Brandon Thomas released WordCraft, GridCraft and DeckCraft, free open-source clones of Microsoft Word, Excel and PowerPoint written in Rust with help from Anthropic's Claude. WordCraft covers 88% of Word's ribbon features and GridCraft handles 513 of Excel's 523 worksheet functions, but the team rates them only 50% to 60% ready for real work. The release follows Thomas' ArtCraft clones of Adobe's apps and targets a Microsoft 365 subscription that costs $99.99 a year for a single user. The developer who used AI to rebuild Adobe's Creative Cloud for free has now turned to Microsoft Office, releasing open-source clones of Word, Excel, and PowerPoint built with Anthropic's Claude.