OpenAI announced an agreement to acquire Statsig in September 2025 in an all-stock transaction reported at about $1.1 billion. The deal’s later outcome was not a straightforward transfer of a continuing software business to OpenAI: Statsig said its product business joined Amplitude on May 5, 2026, while the original Statsig team was at OpenAI. That distinction matters if you are trying to understand what the headline value represented—or who now runs the customer-facing product.
What the $1.1 billion figure meant
The approximately $1.1 billion figure was the reported value of an all-stock transaction, not a statement that OpenAI paid $1.1 billion in cash. Reuters reported that the valuation was based on OpenAI being valued at roughly $300 billion at the time. Reuters’ report and TechCrunch’s coverage described the deal as all-stock; The Information reported that the consideration equated to about 0.4% of OpenAI’s shares. That percentage is a reported estimate, not a disclosed share count or cash proceeds figure.
In a stock transaction, the stated dollar value is tied to the value assigned to the shares at the relevant valuation. It should not be read as a guaranteed cash payment to Statsig shareholders, or as proof that Statsig’s customer business was later worth or sold for the same amount.
What OpenAI announced—and what was not yet established
On September 2, 2025, OpenAI announced a definitive agreement to acquire Statsig. The announcement described the intended deal and leadership changes, but said closing was subject to regulatory approval and customary conditions; it did not announce that the transaction had already closed. OpenAI’s announcement and Statsig’s account are explicit about that distinction.
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The most important later public update in the available timeline came from Statsig itself: on June 17, 2026, it said the company had joined the Amplitude family on May 5 and described the original Statsig team as being at OpenAI. This supports a split-outcome account—team at OpenAI, customer-facing product business with Amplitude—but does not, by itself, document the legal closing date or every step in the transfer. Statsig’s update is the source for the later development.
| Date | What was reported |
|---|---|
| September 2, 2025 | OpenAI announced a definitive agreement to acquire Statsig; the deal was subject to regulatory approval and customary conditions. |
| May 5, 2026 | Statsig later said it had joined the Amplitude family. |
| June 17, 2026 | Statsig described its original team as being at OpenAI and announced the Amplitude transition. |
What Statsig built
Statsig supplied tools that help product and engineering teams decide what to release, to whom, and how to measure the result. Its platform included experimentation and A/B testing, feature flags, real-time decisioning, product analytics, and session replay, among related capabilities. OpenAI described the core system as covering A/B testing, feature flagging, and real-time decisioning; Statsig described a broader toolkit for building and shipping products using data.
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Feature flags let a team control which users see a feature without shipping a separate version of the application for every rollout. Experiments compare defined variants against measured outcomes. Together, these capabilities can support gradual releases, controlled tests, and rollback if a change performs poorly. They are infrastructure for product decisions, not proof that a product change is beneficial or safe: teams still need sound experiment design, meaningful metrics, and appropriate safeguards.
Why OpenAI wanted the company
Faster product experimentation
OpenAI said Statsig’s platform was already central to how it shipped products and learned from use. Bringing the technology and team into its Applications organization was intended to accelerate experimentation across ChatGPT, Codex, and future products. OpenAI’s explanation supplies the stated rationale.
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There is also a broader strategic logic, separate from the announced deal terms. AI applications evolve across interfaces, model behavior, feature access, and safety controls. A robust experimentation system can help teams evaluate changes in a controlled way. That does not mean every model or safety decision should be treated as an ordinary A/B test; high-impact changes require suitable oversight and evaluation beyond engagement or conversion metrics.
Product-engineering leadership
Statsig founder and CEO Vijaye Raji was slated to become OpenAI’s CTO of Applications, reporting to Fidji Simo. OpenAI said he would lead product engineering for ChatGPT and Codex, with broader infrastructure and Integrity responsibilities. The company also highlighted Raji’s prior experience building large-scale consumer products at Meta. This leadership appointment made the agreement more than a purchase of software alone.
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What the later Amplitude move changes
The September 2025 announcement described Statsig continuing to serve customers independently during the transition, with customer continuity a stated priority. That was the original plan, not a complete description of the later arrangement. By June 2026, Statsig said the product business had joined Amplitude, while the original team was at OpenAI. Its contact page also directs prospective customers to an Amplitude representative. Statsig’s contact page is a current commercial signal, though it does not answer every question about existing customer contracts.
For readers interpreting the headline, the practical distinction is that OpenAI’s announced transaction brought the team and experimentation capability into its orbit, while the customer-facing Statsig business later became part of Amplitude. The available announcements do not establish that OpenAI currently owns and operates the full Statsig SaaS product.
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What Statsig customers should verify
The original continuity commitment does not settle the terms of every customer’s relationship after the Amplitude transition. Existing customers should use their own contract, account notices, and direct vendor communications to establish the details that affect them.
- Contracting party and renewal: Confirm which legal entity is responsible for the agreement, support, renewal, and any amendments.
- Product access and migration: Ask whether existing SDKs, APIs, dashboards, and feature flags remain supported, and whether any migration is required or optional.
- Pricing and service commitments: Check for changes to plan structure, renewal pricing, service levels, or support channels rather than assuming the original terms continue unchanged.
- Data handling: Review applicable data-processing terms, data access, retention, and export options. The available public transition announcement does not establish what happens to each customer’s historical experiment data.
- Roadmap and integrations: Ask how product changes, compatibility, and any integration with Amplitude will be communicated.
Statsig’s published enterprise terms and data-processing terms are relevant documents to review, but customers should confirm which version and contracting entity apply to their own account.
Was it an acquihire?
Calling the agreement an acquihire is an interpretation, not a confirmed description from OpenAI or Statsig. The original announcement emphasized both Statsig’s experimentation platform and Raji’s leadership role. The later split—original team at OpenAI, customer-facing product business joining Amplitude—makes a talent-and-infrastructure interpretation plausible, but it does not disclose how the $1.1 billion reported value was allocated among software, employees, intellectual property, or other assets.
The transaction is therefore best understood in stages: an announced all-stock acquisition agreement in 2025, followed by a 2026 arrangement in which the Statsig team was described as being at OpenAI and the product business joined Amplitude. The $1.1 billion headline is real as a reported transaction valuation, but it is not a reliable shorthand for the product’s present owner, the cash received by shareholders, or the value of any later transfer.
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