AI Giants Queue for IPO: Will Anthropic or OpenAI List First?

In mid-2026, Anthropic and OpenAI filed confidential S-1 drafts with the SEC, with combined private valuations approaching $2 trillion. This article compares revenue, losses, cash flow, and regulatory timelines to assess who is more likely to ring the bell first.

1. The Fiercest AI IPO Race in History

As generative AI enters its third year of commercialization, capital return pressure is mounting. Anthropic filed its confidential S-1 in early June 2026; OpenAI followed a week later but publicly stated it has "not decided on timing" and that "it may be a while." Both are preparing to go public — but at very different paces.

Private valuations have hit a ceiling: Anthropic closed a $65B Series H at roughly $965B; OpenAI sits near $852B. Growth equity LPs are near capacity, making the public market the only viable path forward.

2. Anthropic vs OpenAI: Key Metrics Compared

Anthropic's ARR growth and valuation multiple (~20x) outpace OpenAI's (~34x), and its leadership is more aggressive on timing. OpenAI faces heavier compute commitments (over $600B through 2030) and reported a ~$21.3B net loss in Q1 2026.

3. The Numbers That Matter

Anthropic targets October 2026; Sam Altman has said any valuation below $1 trillion is "off the table" for OpenAI — raising the bar for whenever it does decide to list.

4. Four Reasons Anthropic May List First

• Earlier filing — Anthropic submitted on June 1, roughly a week before OpenAI, starting the SEC clock first.
• Clearer financial story — $47B ARR, 40% gross margin, and a stated 2028 cash-flow-positive target are easier to sell to institutions.
• More aggressive leadership — Anthropic hired Wilson Sonsini (Google's 2004 IPO counsel) and named an October target; OpenAI publicly downplayed urgency.
• Competitive strategy — being first locks in the "AI first stock" narrative and institutional allocation — strong motivation to beat OpenAI to market.

5. What Investors Should Watch

Regardless of who lists first, watch for extreme valuation multiples alongside ongoing losses, novel AI safety disclosure requirements, and compute capex pressure on margins. Long-term holders should track ARR growth and unit economics — not just the "first AI IPO" label.

6. Frequently Asked Questions

7. Local AI on Mac mini Is Worth Building Too

Whether Anthropic or OpenAI lists first, cloud LLM API costs and latency remain daily pain points for developers. Apple Silicon's unified memory architecture lets Mac mini M4 run lightweight models, vector search, and inference far more efficiently than comparably priced Windows GPU setups — without ongoing API fees, with data staying local.

macOS natively supports Python, MLX, and Core ML toolchains; Gatekeeper and SIP make long-running unattended workloads safer. At roughly 4W idle power and exceptionally low crash rates, Mac mini M4 is the most cost-effective local AI infrastructure available today. Get one now and build your own compute foundation alongside the IPO frenzy.

Bottom line: in the 2026 AI IPO race, Anthropic leads on filing timing, ARR growth, and management urgency — making a Q4 2026 listing more likely. OpenAI is larger but leaning toward 2027. Focus on valuation discipline and regulatory risk, not just who rings the bell first.