{"slug": "the-official-deepswe-number-is-footnoted-to-deepseek-harness", "title": "The Official DeepSWE Number Is Footnoted to DeepSeek Harness", "summary": "DeepSeek released its V4-Pro model and an open-source developer tool, DeepSeek Harness, on August 13. The official DeepSWE score for V4-Pro is 62.7, up from 12.8 for the preview, with the footnote indicating tests were run inside the harness. The harness features a plugin system with revertible effects, named Cordis, and peak API pricing is $3.96 per million tokens.", "body_md": "On August 13, DeepSeek shipped four things in one day. V4-Pro left preview. Peak and off-peak API prices start at 16:00 UTC on August 16. An 88-page draft paper went up on spatiotemporal composability. And `deepseek-harness`\n\ndropped as a developer preview, MIT license, one command: `npx @deepseek-ai/dsh web`\n\n.\n\nThe model headlines ate the English YouTube tab. I stayed on the harness.\n\nOfficial figure for DeepSeek-V4-Pro-0813: DeepSWE 62.7, against 12.8 for the preview. The footnote says public code-agent sets were tested inside DeepSeek Harness in minimal mode. Fable 5 is still at 70.0 on the same grid.\n\nThe loop is a plugin. Unload is written as revertible effects. They named that implementation Cordis. Peak output on V4-Pro is $3.96 per million tokens.\n\nI put the footnote, the plugin topic, and the peak-hour bill into a four-minute video.\n\nThe August 13 write-up is still the plumbing version: [DeepSeek's Harness Is the Price Signal](https://dev.to/reidmarlow/deepseeks-harness-is-the-price-signal-17bl). This is the scoreboard version.\n\nIf you already run Claude Code with a DeepSeek key taped on, does the plugin topic change anything for you?", "url": "https://wpnews.pro/news/the-official-deepswe-number-is-footnoted-to-deepseek-harness", "canonical_source": "https://dev.to/reidmarlow/the-official-deepswe-number-is-footnoted-to-deepseek-harness-1chj", "published_at": "2026-08-16 14:39:47+00:00", "updated_at": "2026-08-16 15:12:30.013699+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "developer-tools"], "entities": ["DeepSeek", "DeepSeek-V4-Pro", "DeepSeek Harness", "Cordis", "DeepSWE"], "alternates": {"html": "https://wpnews.pro/news/the-official-deepswe-number-is-footnoted-to-deepseek-harness", "markdown": "https://wpnews.pro/news/the-official-deepswe-number-is-footnoted-to-deepseek-harness.md", "text": "https://wpnews.pro/news/the-official-deepswe-number-is-footnoted-to-deepseek-harness.txt", "jsonld": "https://wpnews.pro/news/the-official-deepswe-number-is-footnoted-to-deepseek-harness.jsonld"}}