China’s DeepSeek tests AI ‘harness’ as cheap V4 model jolts Silicon Valley - South China Morning Post
First sign DeepSeek was testing an agent harness, surfacing alongside the low-cost V4 model that had already jolted Silicon Valley.
3 items · 2 sources · 2 days
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DeepSeek open sourced Harness, a plugin-architecture agent framework pitched as a rival to Claude Code, and paired the launch with V4-Pro API access at higher prices than the base V4 model.
DeepSeek was spotted testing an agent harness in early August, alongside the cheap V4 model that had already jolted Silicon Valley on price. Ten days later it open sourced that harness outright, pairing the release with a pricier V4-Pro API tier.
Arc
First sign DeepSeek was testing an agent harness, surfacing alongside the low-cost V4 model that had already jolted Silicon Valley.
DeepSeek formally launches Harness as an open source rival to Claude Code, pairing it with V4-Pro on API at a higher price than before.
Architecture detail: Harness is built so every capability ships as a plugin, rather than a fixed built-in toolset.
First sign DeepSeek was testing an agent harness, surfacing alongside the low-cost V4 model that had already jolted Silicon Valley.
DeepSeek formally launches Harness as an open source rival to Claude Code, pairing it with V4-Pro on API at a higher price than before.
Architecture detail: Harness is built so every capability ships as a plugin, rather than a fixed built-in toolset.
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