SaaSpocalypse Now

On Friday 30 January, Anthropic announced 11 open-source Cowork plugins that ‘extend Claude’s agentic capabilities beyond general tasks into specialised business functions’. These included a legal plugin covering contract review, compliance tracking and NDA triage. 

The markets reacted dramatically. Tech and legal tech stocks plummeted. Thomson Reuters lost about 15% of its value, LexisNexis’ parent company RELX dropped 14%, Wolters Kluwer fell 13% and LegalZoom dropped nearly 20%. SaaS (Software as a Service) companies including DocuSign, Salesforce and Adobe stocks lost 7–11% and the Nasdaq-100 fell 1.6% overall, with the damage concentrated in software and data services. (Source: Legalcomplex.)

This was surprising, because the earlier release of Claude Cowork did not rattle the markets. Claude Cowork is an agentic tool which news and digital media website Mashable describes as a version of Anthropic’s AI coding assistant Claude Code for non-developers. Instead of writing code, users grant Claude access to a folder on their computer and assign tasks to it, such as organising files, drafting reports and compiling spreadsheets. Claude Cowork simply led to more conversations about vibe-coding, which is prompting a large language model (LLM) to build custom tools and apps as you need them. The AI writes the code so that you do not have to and Claude Cowork facilitates this. 

But the plugins provoked a massive knee-jerk reaction that the financial press described as the ‘SaaSpocalypse’. The combined market capitalisation decline across Thomson Reuters, Wolters Kluwer, and related legal technology stocks exceeded $285bn in the five trading days following Anthropic’s announcement. Cumulative losses across the sector pushed towards $1trn when Claude Opus 4.6 launched on 6 February with autonomous multi-agent coordination capabilities.

This was the first time an AI product launch moved global equities at this scale. But legal market analyst Raymond Blyd of Legalcomplex observes that the peak prices for the legal tech stocks Wolters Kluwer, RELX and Thomson Reuters were before July 2025, when Microsoft laid off 20% of its in-house lawyers. So there might have been a foreshock for this unprecedented rout.   

Legal AI fundraising accelerates

While public legal tech stocks have still not recovered, venture funding in legal AI continues to accelerate. Forbes reported that agentic AI platform Harvey is in talks to raise $200m at an $11bn valuation in a Series G funding round led by Sequoia Capital and GIC. Its closest rival Legora, which is Europe’s fastest-growing legal AI company, is in talks to raise $400m at a $5bn-$6bn valuation in a Series D funding round just four months after its last raise. And Lawhive, a London-based AI-native consumer law firm, raised $60m in series B funding to expand its US business just two days after the stock market rout.

Notwithstanding the continuing sell-off of tech and legal tech stocks, investors are even keener to invest in legal AI – and GenAI – companies. On 12 February, Anthropic raised $30bn in a Series G funding round, valuing the company at $380bn. Open AI is reportedly assembling a round of $100bn at an $830bn valuation, with both companies expected to pursue IPOs later this year.

Game changer for legal AI?

What makes the Claude Cowork legal plugin different? For the first time, a foundation model is packaging complete workflow solutions that are potentially in competition with incumbent legal AI vendors. Some analysts reported this as Anthropic positioning itself for direct competition with Harvey and Legora. As Legora CEO Max Junestrand wrote on LinkedIn: ‘There is an important difference between a plugin and operating a collaborative, matter-centric, production-grade platform used by hundreds of the world’s leading legal teams.’ While the fact that Legora is built on Claude could be a strategic vulnerability, Legora and Harvey – which is built on OpenAI, but also uses Claude as an underlying model – are comprehensive specialist offerings designed for professional legal practice. 

Legal AI vendors are already developing Cowork extensions and commentators are flagging this as a potential game changer. Bob Ambrogi wrote on LawSites: ‘Many legal AI vendors have built their products on the “model + wrapper + workflow” model, assuming that the model layer remains a neutral player. But now Anthropic is effectively bundling its own “model + wrapper + workflow” – circumventing the legal vendor and going straight to the customer.’ Because the plugin is open source and built to be customised, corporate legal ops professionals can tailor it to their needs ‘without waiting for a vendor to build out those features’. 

Connection not competition?

However, there are clear indications that Anthropic is looking to connect with rather than compete with incumbent vendors. On 24 February, Anthropic announced at its Enterprise Agents briefing that Claude Cowork would integrate directly with enterprise apps such as DocuSign, LegalZoom and Salesforce. 

The partnership vibe was reinforced in respect of legal by Thomson Reuters CEO Steve Hasker participating in a customer panel at the briefing. This was followed by Anthropic’s video demonstrating how Thomson Reuters used the Claude Agent SDK (software development kit) to reimagine its CoCounsel Legal agent. 

On the same day, LexisNexis announced the integration of Anthropic’s legal plugin into its Protégé GenAI platform, enhancing its existing AI workflow capabilities. This has reassured the market, which immediately started to bounce back (Thompson Reuters gained 11%, RELX gained 5.5% and DocuSign and LegalZoom gained more than 2%), though it still has not recovered from the SaaSpocalypse. 

Predictably, law firms which are already using GenAI reacted in a more measured way. Damien Behan, innovation and technology director at Brodies, correctly understood the legal plugin to indicate that Anthropic was seeking to integrate with legal tech vendors and products rather than compete directly with them. ‘I’m more persuaded by the view that Anthropic has created the plugin to show that it has capabilities in these areas, rather than to try to compete in the legal market; that their interest is in getting startups and other suppliers to use their large language model to build legal tech. It’s made a big splash, and that may be as much as they wanted from it,’ he observes.

However, there are practical implications. ‘The legal plugin is effectively a set of prompts that [together] form a playbook for doing certain types of work, e.g., contract review,’ Behan explains. ‘Those prompts, which you can download from GitHub, could be used with any LLM and are similar to ones that are already being used by firms to build those capabilities in other legal AI tools.’ 

Behan notes: ‘The difference with the Cowork plugin is that it is “agentic” in that it can read files from the local computer and could integrate with your other systems via MCP (described as the USB-C of AI for how it enables systems to connect to one another). So, the thinking is that it could be more contextually aware of your firm’s documents rather than relying on third-party content.’

Behan also flags up potential security issues, including a shadow AI risk where usage is not centrally managed or logged. But these observations were made before the enterprise software integration announcements. 

'Most AI developments in legal have been behind enterprise walls – this one is consumer-grade and visible. It made it really obvious that building a legal AI tool is not as hard as some of these companies need it to be' 

^{Michael Kennedy, Addleshaw Goddard}

Law firm innovators take an equally pragmatic approach. I asked Michael Kennedy, head of innovation and legal technology R&D at Addleshaw Goddard LLP, for his perspective on the initial market reaction to the Cowork plugin. ‘The reaction was serious – the market genuinely moved. The big incumbents like Thomson Reuters and LexisNexis aren’t going to disappear because of a plugin. They have deep knowledge bases and genuine moats around their content. But it does challenge their growth story: it’s harder to capture a bigger market if the landscape becomes more fragmented and accessible. So it’s probably more a bet against future growth than against survival,’ he said. This is surely part of the rationale for Anthropic’s subsequent rapid integration with both Thomson Reuters and LexisNexis GenAI platforms.

But this does not negate the qualities and market positioning which catapulted Claude into the heart of legal tech and legal AI. ‘What made this one land differently is how accessible it is,’ says Kennedy. ‘Anyone can use it, right now. Most AI developments in legal have been behind enterprise walls  – this one is consumer-grade and visible. It made it really obvious that building a legal AI tool is not as hard as some of these companies need it to be.’

He adds: ‘Technically, none of this is new. You could use Claude Code today to build your own version with your own playbooks and drafting preferences as context. But wrapping it into a polished product with the Anthropic brand on it is what made the market pay attention.’

As well as disrupting the legal tech market, the Cowork legal plugin has raised the bar for new legal AI start-ups. ‘Start-ups need something more niche – deep domain knowledge, workflow-specific design, or integration into how lawyers actually work. This is where Thomson Reuters and LexisNexis still have an advantage: they have the knowledge, the data, the case law, and that’s a real moat. A £10-per-user contract plugin with generic prompting behind it is a harder sell now,’ says Kennedy.