In the present day, OpenRouter introduced that they’ve entered into an settlement to be acquired by Stripe, three years from when it was launched in 2023.
OpenRouter launched as “the unified interface for LLMs” with solely 4 fashions (GPT-3.5, GPT-4, Collectively’s GPT NeoXT, and Cohere xlarge) and two core bets: 1) AI utilization can be large and ubiquitous, and a pair of) there can be loads of completely different fashions with their very own units of tradeoffs that customers will need. Each of these issues ended up being overwhelmingly true. Since their launch, token utilization on OpenRouter has grown ~30,000x to a 4.5+ quadrillion-token annual run price with a surprisingly excessive spend on the platform. From a mere 4 fashions, OpenRouter now helps over 500!
We at Menlo Ventures have been lucky sufficient to associate with this unbelievable staff on the seed spherical in March 2025 by way of our Anthology Fund, in partnership with Anthropic. Founder and CEO Alex Atallah was previously the founding father of OpenSea, as soon as valued at $13.3B. His co-founders have been hacker extraordinaire Louis Vichy, somebody he’d met on Discord, and the ferocious execution machine, COO Chris Clark. We led their Sequence A in Might 2025 with Matt becoming a member of the board and Deedy as a board observer. We then doubled down of their Sequence B earlier this yr after each seeing the explosion of their clients and income and a compelling roadmap to offer mannequin intelligence. In expertise, typically it takes years of perception for an concept to turn into the consensus. That occurred a couple of weeks in the past, when over 10 completely different firms, from Ramp to Cursor, launched their very own routers. In a brief period of time, OpenRouter has turn into some of the essential firms within the AI period.
Stripe, on the outset, could look like an unlikely acquirer for OpenRouter, however the similarities are uncanny. Each are drop-in APIs that simplify advanced transactions with a take price. The latter simply does it solely for AI fashions. Collectively, true to Stripe’s mission, they enhance the GDP of the web.
Why We Invested in OpenRouter
OpenRouter was one of many first firms Deedy met after becoming a member of Menlo in 2024. The product sat squarely within the heart of our AI infrastructure thesis. Menlo’s 2024 Enterprise AI report states two of the core beliefs we needed to maintain to put money into OpenRouter: that AI spending would rise dramatically and that builders would undertake a number of fashions.
It was very clear to us, who additionally code and use these fashions, that there are radically completely different value, latency, and efficiency tradeoffs between completely different fashions. You don’t essentially want the frontier intelligence of Fable once you’re doing a easy NLP job of figuring out entities in textual content. However it’s manner too cumbersome for customers to enter every completely different mannequin firm’s web site, create an account, work out learn how to create a key, be sure they preserve the important thing secure, be sure they align to that mannequin’s barely completely different API endpoint spec, after which do mannequin administration themselves. A central gateway might sound easy, nevertheless it’s truly deceptively troublesome infrastructure that few would wish to construct and keep.
In enterprise, we regularly discuss moats, however purely within the technical sense. OpenRouter had a basic moat of scale—extra customers, extra capability to foretell demand and deal with load, simpler to scale contracts with labs and have predictable demand for tokens—ultimately attending to a spot the place new mannequin labs wish to listing on OpenRouter first for distribution. And one of many issues we’ve noticed ever because the acceleration of software program startup formation with vibe coding being ubiquitous is that, to interrupt into enterprise, consumers find yourself selecting the product that has already gained the hearts and minds of the builders at their firms. Take into consideration Anthropic, OpenAI, xAI, Cursor, Cognition, ElevenLabs, Lovable, Fireworks—all of them gained the developer first! So did OpenRouter.
Since investing:
- OpenRouter now processes 30,000x the variety of tokens they did at launch, rising 33% MoM for 3 years and persistently doubling each 11 weeks.
- The mannequin panorama exploded with unbelievable open-source fashions from China (DeepSeek, GLM, Kimi), Grok, Meta, and Pondering Machines. OpenRouter helps over 500 fashions on over 80 suppliers for 10M customers.
- Massive, new fashions typically launch on OpenRouter first, together with OpenAI, X, and Meta. Mark Zuckerberg, who hardly ever tweets, a lot much less about different merchandise, introduced Muse Spark on OpenRouter, as did Elon Musk. OpenAI offers unique reductions by way of OpenRouter, like with Terra and Luna.
- Their product-led progress movement transformed into one of many quickest gross sales cycles we’ve seen for his or her enterprise product, which lets you provision, management entry, and handle AI budgets inside your org.
- As a result of OpenRouter might negotiate contracts throughout suppliers, it has the very best uptime of even frontier fashions.
The OpenRouter Origin Story and Journey
Any tenured startup builder will let you know that the trail to discovering product-market match isn’t linear. Such was the case at OpenRouter. The truth is, OpenRouter’s roots hint again to April 5, 2023 after they launched as Window (windowai.to), a Chrome extension that allow you to use a number of fashions without delay for numerous chat apps on the web. The concept was to forestall vendor lock-in however not have to present apps your API keys to make use of a number of fashions. It was impressed by how crypto wallets work—a testomony to Alex’s former expertise with OpenSea—and supported 4 fashions on the time. The primary decide to the Window GitHub repo that referenced “OpenRouter” was on April 24. A month later, they added their first Anthropic v1 models, enabled auto routing to the right model based on prompt, and constructed their now widely recognized rankings page with the title OpenRouter.
The official OpenRouter rebrand occurred on Aug 10, 2023 with the tagline, “A unified interface for LLMs,” after they have been doing about ~3B tokens/week. The fashions on the charts then were unrecognizable from the fashions we’ve right now. They pushed Playground, a single chat interface the place you could possibly get responses from a number of fashions in a single place. By November, they’d hit 52 fashions, 2000+ apps and ~8B tokens/week. This was product-market match!
On the Way forward for Routers
Opposite to well-liked perception, OpenRouter’s main product is not routing tokens; it’s being one of the best AI gateway. Whereas they do provide an Auto Router, most builders primarily come to OpenRouter to get entry to all of the completely different fashions and make routing selections themselves. Just lately, the burgeoning prices of enterprise LLM spend have turn into an rising drawback for firms like Uber, Coinbase, and Microsoft. The concept of a router as a panacea to value is compelling: Why ought to I take advantage of the costliest mannequin for each subtask of my agent run once I can simply route simpler duties to cheaper fashions? In the previous couple of weeks, the trade has seemingly woken as much as this concept concurrently. Over 10 completely different firms launched their very own routers, from Ramp to Cursor and extra.
Nonetheless, routing primarily based solely on the immediate is definitely a little bit of a idiot’s errand. On the planet of brokers, once you’re doing a long-running job, you want a whole lot of context to verify the immediate goes to the best mannequin. “Discover this file within the codebase” could possibly be a job for an inexpensive, easy LLM or a frontier one relying on the scale of the codebase and what the unique context is. In a multi-step agentic job, the price of a router doing the flawed factor compounds downstream, resulting in a lot worse-quality outcomes. The elemental foundation of a differentiated router product is a superb unified API with a whole lot of customers already. These customers have allowed OpenRouter to silently choose up some of the expansive datasets of prompts, fashions for these prompts, contexts round these duties, and the ultimate outcomes. When utilized in actual manufacturing settings, OpenRouter now serves as one of the simplest ways to mitigate prices by doing routing whereas genuinely preserving high quality. You gained’t must hack round messy evals or constantly replace your prompts. You possibly can log in to a dashboard and all it says is, “It can save you $100K a yr by switching to Muse Spark over GPT 5.6 Sol on this a part of your codebase the place you utilize it primarily for summarization. We’ve run the eval for you robotically already!” That is the way forward for routers.
Stripe + OpenRouter
Stripe and OpenRouter share the same heritage. Each firms began by profitable the developer earlier than transferring upmarket. Each firms share a easy, daring design language. Andrej Karpathy known as OpenRouter the “switch swap” of AI, simply as Stripe turned the swap for fee processing.
The acquisition additionally marks one of many first massive infrastructure outcomes of the AI period. It gained’t be the final. The constructing blocks for managing fashions, value, and compute now exist, they usually’re letting generational firms type quicker than ever. Congratulations to Alex, Chris, Louis and your entire staff for constructing the definitive market for AI fashions. Stripe got down to develop the GDP of the web. As of right now, that features intelligence.
Menlo is actively investing throughout the AI infrastructure stack, from the closed mannequin ecosystem (Anthropic), open mannequin ecosystem (Goodfire, OpenRouter), core software program infrastructure (Fireworks, Modal) and next-generation bodily infrastructure (Gimlet). If you happen to’re innovating within the AI infra stack, we’d love to listen to from you.
