{"slug": "vespper-the-only-sota-post-trained-model-to-edit-word-documents", "title": "Vespper the only sota post-trained model to edit word documents", "summary": "Vespper released v1.0 of its DOCX MCP server, which it calls the only SOTA post-trained model for editing Microsoft Word documents, reporting benchmark results run on GPT-5.6 Sol. In 10 matched comparisons against five alternatives across two models, Vespper cost $0.054 per task versus $0.157 for the DOCX Skill and $0.240 for Office CLI MCP, scored 81.4% accuracy against 78.1% and 65.2%, and finished in 14.6 seconds versus 51.5 and 57.1 seconds. Vespper said the median competitor costs 2.43× as much, with Vespper 16.2 percentage points more accurate and 1.97× faster; the company's SOC 2 program is still in progress and self-hosting is an enterprise option.", "body_md": "# The only SOTA\n\npost-trained model for Word document editing\n\n``` python\nimport Vespper from \"vespper\";\nimport { createMCPClient } from \"@ai-sdk/mcp\";\nimport { generateText } from \"ai\";\n\nconst client = new Vespper();\nconst sessionId = await client.openSession(\"./nda.docx\");\n\nconst mcp = await createMCPClient({\n  transport: {\n    url: \"https://mcp.vespper.com/mcp\",\n    headers: { Authorization: client.authorizationHeader },\n  },\n});\nawait client.patchMCPTools({ mcp, sessionId });\n\nawait generateText({\n  model: \"openai/gpt-5.6-sol\",\n  tools: await mcp.tools(),\n  prompt: \"Fill this NDA with the data from the .csv file\",\n});\n```\n\nMade by professionals from\n\n## 3x faster, 2x cheaper, more accurate\n\n## Better, cheaper & faster.\n\nVespper is 2.7–2.9× cheaper and 2.7–3.5× faster than the DOCX skill, while being more accurate.\n\n1. 1Vespper DOCX$0.054\n2. 2DOCX Skill$0.157\n3. 3Office CLI MCP$0.240\n\n1. 1Vespper DOCX81.4%\n2. 2DOCX Skill78.1%\n3. 3Office CLI MCP65.2%\n\n1. 1Vespper DOCX14.6s\n2. 2DOCX Skill51.5s\n3. 3Office CLI MCP57.1s\n\nAcross all 10 matched comparisons, five alternatives × two models, the median competitor costs 2.43× as much, while Vespper costs 58.9% less. Vespper is 16.2 percentage points more accurate and 1.97× faster, with 47.7% lower latency making it the best option for agents to edit .docx files.\n\nVespper v1.0 benchmark results using GPT-5.6 Sol. Cards compare the same task against the DOCX Skill and Office CLI MCP. [Read the full benchmark methodology](https://www.vespper.com/blog/launching-vespper-docx-mcp) or [compare Vespper with the DOCX skill](https://www.vespper.com/compare/docx-skill).\n\n## Kickstart your next project with these open-source templates.\n\n[Example](https://github.com/vespperhq/word-add-in)\n\n### Word add-in\n\nA complete Office add-in that brings agentic document editing directly into Microsoft Word.\n\n[Example](https://github.com/vespperhq/onlyoffice-add-in)\n\n### ONLYOFFICE plugin\n\nA chat plugin for ONLYOFFICE Docs that proposes AI edits as suggestion cards to review and apply.\n\n[Example](https://github.com/vespperhq/eigenpal-docx-editor)\n\n### EigenPal's docx-editor\n\nA browser app with a chat beside EigenPal's docx-editor, where AI edits appear as suggestions or tracked changes.\n\n## Frequently asked questions\n\n## Why Vespper?\n\nVespper gives AI agents three tools to read, search and edit Microsoft Word documents. Agents work with HTML while Vespper applies edits to the original DOCX, preserving styles and formatting and recording edits as Word tracked changes.\n\n## Is Vespper SOC 2 compliant?\n\nVespper's SOC 2 program is in progress. Contact us at founders@vespper.com to review the current security documentation and discuss your requirements.\n\n## Do you offer a skill instead of MCP?\n\nA standalone skill is coming soon. For now, connect your agent through our MCP server. Email founders@vespper.com if you're interested in the skill.\n\n## Can I self-host Vespper models?\n\nSelf-hosting is available as an enterprise option. Contact founders@vespper.com to discuss the deployment, security and support requirements for your environment.\n\n## How does Vespper handle sensitive documents?\n\nEnterprise plans can include zero-data-retention deployment and self-hosting. Data handling and retention controls are scoped and documented for each customer. Contact founders@vespper.com to confirm the controls available for your deployment.\n\n## How quickly can I get started?\n\nYou can start experimenting within minutes using our hosted MCP. For enterprise and self-hosted setups, our team provides guided onboarding to help you deploy Vespper quickly and securely in your stack.\n\n## Join the community\n\nShare what you're building, ask questions, and see how other teams use Vespper with their agents.\n\n[Join us on Slack](https://join.slack.com/t/vesppercommunity/shared_invite/zt-44ur3mke8-PM0uI6PnP4ctL~Zk28MzZA)", "url": "https://wpnews.pro/news/vespper-the-only-sota-post-trained-model-to-edit-word-documents", "canonical_source": "https://www.vespper.com/?um_source=hnlaunch-5nov", "published_at": "2026-11-05 20:08:58+00:00", "updated_at": "2026-11-05 20:21:08.272429+00:00", "lang": "en", "topics": ["ai-agents", "ai-tools", "agent-protocols", "ai-products", "developer-tools"], "entities": ["Vespper", "Microsoft Word", "DOCX Skill", "Office CLI MCP", "GPT-5.6 Sol", "ONLYOFFICE", "EigenPal"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/vespper-the-only-sota-post-trained-model-to-edit-word-documents", "markdown": "https://wpnews.pro/news/vespper-the-only-sota-post-trained-model-to-edit-word-documents.md", "text": "https://wpnews.pro/news/vespper-the-only-sota-post-trained-model-to-edit-word-documents.txt", "jsonld": "https://wpnews.pro/news/vespper-the-only-sota-post-trained-model-to-edit-word-documents.jsonld"}}