Cursor admits its new coding model was built on top of Moonshot AI’s Kimi
In a significant development within the AI coding landscape, Cursor, a well-funded startup, has launched its new coding model, Composer 2. This model has been touted as offering “frontier-level coding intelligence.” However, the launch has been marred by controversy as it has been revealed that Composer 2 is built on top of Moonshot AI’s Kimi, an open-source model.
The Controversy Unfolds
The controversy began when an X user, known as Fynn, claimed that Composer 2 was essentially “just Kimi 2.5” with additional reinforcement learning. Kimi 2.5 is an open-source model that was recently released by Moonshot AI, a Chinese company backed by Alibaba and HongShan (formerly Sequoia China). Fynn provided evidence that suggested the code used in Composer 2 identified Kimi as its underlying model, leading to questions about Cursor’s transparency regarding its development process.
Cursor’s Response
Cursor, which raised a staggering $2.3 billion last fall at a valuation of $29.3 billion and is reportedly generating over $2 billion in annualized revenue, initially failed to mention Moonshot AI or Kimi in its announcement. However, the company’s vice president of developer education, Lee Robinson, later acknowledged the origins of Composer 2, stating, “Yep, Composer 2 started from an open-source base!” He clarified that only about 25% of the compute resources used in the final model were derived from Kimi, with the remaining 75% coming from Cursor’s own training processes.
Performance and Licensing
Robinson emphasized that the performance of Composer 2 on various benchmarks is “very different” from that of Kimi. He also asserted that Cursor’s utilization of Kimi was in accordance with the terms of its license. This sentiment was echoed by the Kimi account on X, which congratulated Cursor and confirmed that the use of Kimi was part of an authorized commercial partnership with Fireworks AI.
The Open Model Ecosystem
The Kimi account expressed pride in seeing Kimi 2.5 serve as the foundation for Cursor’s new model. They stated, “Seeing our model integrated effectively through Cursor’s continued pretraining & high-compute RL training is the open model ecosystem we love to support.” This acknowledgment highlights the collaborative nature of AI development in the current landscape, where companies often build on existing models to enhance their offerings.
Why the Lack of Acknowledgment?
Despite the positive reception from the Kimi account, questions remain about why Cursor did not openly acknowledge its use of Kimi from the outset. One possible reason could be the potential embarrassment associated with not creating a model entirely from scratch. Additionally, building on a Chinese model might be viewed as problematic in the context of the ongoing AI “arms race” between the United States and China. The competitive landscape has led to heightened scrutiny of partnerships and collaborations, particularly those involving Chinese companies.
Cursor’s Admission
Cursor co-founder Aman Sanger admitted that it was a mistake not to mention the Kimi base in their initial blog post. He stated, “It was a miss to not mention the Kimi base in our blog from the start. We’ll fix that for the next model.” This admission reflects a growing awareness among tech companies about the importance of transparency in their development processes, particularly in a field as scrutinized as AI.
The Future of AI Development
The incident surrounding Cursor and Kimi underscores the complexities of AI development in today’s environment. As companies race to innovate and stay competitive, the lines between original creation and building upon existing models can become blurred. The collaboration between Cursor and Moonshot AI exemplifies the trend towards leveraging open-source technology while also raising questions about intellectual property and ethical considerations in AI.
Conclusion
As AI technology continues to evolve, the importance of transparency and ethical practices in development will only grow. The revelation that Cursor’s Composer 2 was built on Kimi serves as a reminder of the collaborative nature of the tech industry, as well as the challenges that come with navigating partnerships across geopolitical lines. Moving forward, it will be crucial for companies to maintain open communication with their users and stakeholders to foster trust and innovation in the rapidly changing AI landscape.
Note: This article is based on information available as of October 2023 and reflects the ongoing developments in the AI coding sector.
