An internal communication from Amazon has disclosed a notable change in its approach concerning the in-house AI coding tool, Kiro. Initially the preferred option for developers, Kiro is now eclipsed by rivals such as OpenAI’s Codex and Anthropic’s Claude. This shift highlights the growing demand from employees for enhanced coding resources and emphasizes the urgent necessity for tech firms to adapt rapidly.
In November, Amazon’s management encouraged employees to focus on Kiro instead of external AI development tools. A memo indicated, “While we will continue to support the tools currently in use, we do not intend to endorse additional third-party AI development tools.” This instruction demonstrated Amazon’s dedication to its own offerings, despite appearing counterproductive considering the company’s considerable investments in competing AI solutions.
By May 2026, the situation had transformed significantly. Amazon started to incorporate Claude and Codex for its developers, recognizing the limitations of its proprietary tools. Business Insider reported that Jim Haughwout, Amazon’s VP for software builder experience, notified employees that Claude Code would be available right away, with Codex to follow soon after.
This choice exposes a stark reality: companies in the AI field are under immense competitive pressure and must provide their teams with the best tools for success. Amazon’s previous strategy of restricting third-party tools has proven to be ineffective, particularly as the company confronts issues arising from poorly executed AI-generated code.
Earlier this year, Amazon’s software developers voiced their dissatisfaction regarding the limited access to Claude Code, part of the effort to promote Kiro. Employees questioned the rationale behind advocating for a tool they were unable to use directly. “Customers will wonder why they should trust or utilize a tool that we did not authorize for internal use,” one employee remarked, echoing widespread concerns about trustworthiness and effectiveness.
While an Amazon spokesperson admitted to Kiro’s shortcomings, asserting that approximately 83 percent of engineers still primarily depend on the in-house tool, this statement seems more like damage control in light of recent developments than a genuine reflection of Kiro’s efficacy. The adoption of Claude and Codex clearly suggests that Amazon’s leading product may fall short of meeting its internal teams’ needs.
Amazon’s predicament reflects a larger trend within the tech industry, where the swift evolution of AI technologies places substantial pressure on companies to keep pace. Incorporating third-party tools not only addresses the competitive environment but also ensures developers have access to the most effective resources. As the industry progresses, companies must remain adaptable for the benefit of both their employees and clients.
