What OpenAI announced
On September 2, 2025, OpenAI announced a definitive agreement to acquire Statsig, subject to customary closing conditions and regulatory approval. The all-stock deal was valued at roughly $1.1 billion in reporting based on OpenAI’s then-current valuation. The headline number drew attention, but the more consequential part of the announcement was organizational: Statsig founder and CEO Vijaye Raji would become OpenAI’s Chief Technology Officer of Applications.
Raji was set to report to Fidji Simo, OpenAI’s CEO of Applications, and lead engineering for products including ChatGPT and Codex. OpenAI said the remit would span core systems, infrastructure, and product integrity. That made the deal both an acquisition and a senior leadership hire for the layer where models become products used by millions of people.
Why Statsig mattered
Statsig built infrastructure for feature flags, controlled experiments, product analytics, and real-time configuration. Those tools sound less dramatic than a frontier model, but they determine whether product teams can release changes safely and learn from actual behavior instead of opinion.
Separate deploying code from exposing a feature, making staged rollouts and rapid rollback possible.
Compare variants and estimate whether a product change caused an observed outcome.
Adjust product behavior without shipping a new client for every change.
Connect releases to usage, retention, conversion, quality, and guardrail metrics.
Limit a risky change to a small group before broad release.
Give many teams consistent methods rather than bespoke dashboards and rollout scripts.
For OpenAI, experimentation is unusually difficult. A model change can alter latency, cost, helpfulness, safety behavior, tool performance, and user trust at the same time. The company also operates several fast-moving surfaces—ChatGPT, Codex, enterprise products, APIs, and internal tools. Buying Statsig’s team and leadership offered a way to strengthen the discipline around that complexity.
The applications organization
The deal arrived during a broader reorganization. OpenAI was building an Applications division under Simo, with product and engineering leadership aligned around turning research into dependable services. Raji’s appointment placed an engineer with experience at Microsoft, Facebook, and Statsig inside that effort.
The strategic logic was not simply “OpenAI needs A/B tests.” Large application organizations need systems that let teams ship independently while preserving common safety, measurement, and rollback controls. Statsig represented both a mature toolkit and a management philosophy: ship behind controls, measure effects, and make decisions from evidence.
The 2026 Amplitude handoff
The customer-facing outcome changed in 2026. On May 5, Amplitude announced a strategic partnership under which it would take over the Statsig brand and customer relationships, maintain and develop the platform, and integrate Statsig’s capabilities with Amplitude’s analytics products. Statsig later described the transition as joining the Amplitude family and entering the first phase of an integrated roadmap.
Amplitude’s wording also clarified that the Statsig team at OpenAI would work with Amplitude. Public Statsig enterprise terms now identify Amplitude, Inc. as “Statsig.” Taken together, the disclosures indicate a split: OpenAI kept the people and internal experimentation capability it wanted, while Amplitude became the home for the commercial platform, brand, and customer-facing roadmap.
What the structure reveals
The sequence exposes the actual strategic asset. Statsig’s software was valuable, but OpenAI’s competitive problem is building and operating AI applications at extraordinary speed. Raji and his team brought expertise in experimentation, rollout systems, developer infrastructure, and product decision-making. Those capabilities are more directly useful inside ChatGPT and Codex than in a separate SaaS sales organization.
Amplitude, by contrast, already sells product analytics to external companies. It has the commercial channels, customer success organization, data platform, and incentive to keep Statsig available as a product. The 2026 arrangement therefore places each part with an organization better matched to it.
| Asset | Operational home | Strategic purpose |
|---|---|---|
| Statsig team and Vijaye Raji | OpenAI Applications | Build experimentation and product infrastructure into ChatGPT, Codex, and related applications |
| Statsig brand and customer relationships | Amplitude | Continue the commercial product and support external customers |
| Statsig platform roadmap | Amplitude, in partnership with the team at OpenAI | Maintain the product and combine experimentation with analytics |
| OpenAI’s internal use | OpenAI | Preserve experimentation capability for rapid, controlled application development |
The table is an interpretation of public announcements, not a substitute for the companies’ transaction documents. Financial ownership, licenses, and contractual details may be more complex than the operating picture disclosed publicly.
What it means for customers
Existing Statsig customers did not simply lose the product when the team joined OpenAI. Amplitude said it would maintain and develop Statsig, preserve customer relationships, and work toward an integrated platform. The long-term proposition is a single system connecting product analytics, feature delivery, experimentation, session replay, and behavioral data.
The practical questions are now about execution: whether pricing and contracts remain stable, whether service quality holds during integration, how identity and data systems converge, and whether Statsig’s developer-centered workflow remains distinct. Customers should rely on current notices from Statsig and Amplitude rather than the 2025 acquisition announcement for operational decisions.
Deal timeline
OpenAI agrees to acquire Statsig and appoint Vijaye Raji CTO of Applications, subject to closing conditions.
The initial report focuses on the all-stock valuation, leadership appointment, and application-development strategy.
Amplitude says it is taking over the Statsig brand and customers and will maintain and develop the platform.
Statsig describes Phase 1 of joining the Amplitude family and outlines the combined product direction.
The Statsig team is at OpenAI; the commercial platform and customer-facing roadmap sit with Amplitude.
Frequently asked questions
The deal was reported and announced as an all-stock transaction valued at about $1.1 billion based on OpenAI’s valuation, not a cash purchase.
OpenAI said Raji would become CTO of Applications, reporting to CEO of Applications Fidji Simo and leading engineering for products including ChatGPT and Codex.
The 2026 public arrangement places the Statsig brand, customer relationships, and platform roadmap with Amplitude, while the Statsig team remains at OpenAI and works with Amplitude.
Amplitude says it is maintaining and developing the platform and integrating Statsig capabilities with Amplitude. Customers should rely on current Statsig and Amplitude notices for contractual or migration details.
Sources and references
- OpenAI: Vijaye Raji to become CTO of Applications with acquisition of StatsigOpenAI · primary
- Statsig: OpenAI acquisition announcementStatsig · primary
- Reuters: OpenAI agreement to acquire StatsigReuters · secondary
- Amplitude: Statsig strategic partnershipAmplitude · primary
- Statsig: Statsig + Amplitude Phase 1Statsig · primary
- Statsig enterprise termsStatsig · primary