Anthropic and OpenAI Sprint Toward 2026 IPOs as Revenue Race Reaches New Heights

On May 28, Anthropic announced a $65 billion funding round at a $965 billion valuation and, on the same day, shipped Claude Opus 4.8. The timing was not coincidental. Both Anthropic and OpenAI are preparing initial public offerings for later this year — Anthropic targeting October, OpenAI aiming for September — and each company is now using every available metric to establish market dominance before its filing lands. The result is an AI competition playing out across valuations, revenue figures, and benchmark tables simultaneously.

The Valuation Gap Has Closed — and Flipped

Anthropic's $965 billion post-money valuation now exceeds OpenAI's $852 billion mark from late March, when OpenAI closed a $122 billion round led by SoftBank and priced itself as the world's most valuable AI startup. Anthropic erased that gap in a single quarter, through what the company describes as explosive growth in Claude Code subscriptions and enterprise platform contracts. The $65 billion Series H was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. Amazon Web Services, Google, and Broadcom contributed $15 billion of the total. Samsung, SK Hynix, and Micron joined as strategic chip infrastructure partners.

The valuation inversion is significant beyond the bragging-rights dimension. Institutional investors who receive pre-IPO allocations from both companies now have to make a relative judgment. A gap between $852 billion and $965 billion is large enough that the two offerings will be priced differently, and the company that goes first will set a reference point the second must respond to.

Revenue: Where the Story Gets More Interesting

Valuations are investor bets; revenue is what the public markets will scrutinize. Anthropic disclosed a $47 billion annualized revenue run rate alongside the funding close — roughly five times the $10 billion run rate it reported a year ago and ahead of OpenAI's most recently reported range of $30 to $40 billion. Claude Code accounts for a substantial portion of that growth, with enterprise customers paying per-seat and API-usage fees that compound as developer adoption scales. The revenue trajectory also matters for how each company reaches profitability. Anthropic disclosed its first profitable quarter earlier in 2026. OpenAI has not made a comparable announcement.

Shipping Products as Pre-IPO Signaling

The product cadence at both companies has accelerated in step with the IPO timeline. Anthropic's Claude Opus 4.8 arrived on May 28 with benchmarks the company says top OpenAI's GPT-5.5 and Google's Gemini 3.1 Pro on agentic coding (69.2%), financial analysis, and computer use (84% on the Online-Mind2Web benchmark). The release bundled dynamic workflows — a feature that lets Claude Code orchestrate up to 1,000 parallel subagents — with a new "ultracode" effort mode that targets large-scale codebase migrations. Each of these capabilities is designed to appeal to the enterprise and developer customers whose API spending drives the bulk of Anthropic's revenue. Releasing them alongside the funding announcement compresses the news cycle: investors read the valuation and the product capability evidence in the same week.

"We're seeing enterprises go from evaluating Claude to deploying it at scale in a matter of weeks, not months. The revenue is following the adoption curve." Anthropic executive, investor call, May 2026

Different Business Profiles, Same Destination

Anthropic and OpenAI are not identical businesses, and their eventual filings will tell different stories. Anthropic has concentrated its revenue base on Claude Code subscriptions, enterprise platform deals — PwC, KPMG, Bristol Myers Squibb, Fujitsu — and API consumption from developers and businesses. It has deliberately avoided advertising-supported products and kept free consumer tiers narrow. OpenAI's business is broader: ChatGPT consumer subscriptions, enterprise API usage, Microsoft's Azure integration at a large scale, and newer products like Sora for video generation. Anthropic's model is more concentrated and, in the current moment, faster-growing. OpenAI's model is more diversified, with more surface area for consumer trends to affect its numbers.

Each company will argue to IPO investors that its approach is more durable. Anthropic's pitch is that enterprise contracts are stickier than consumer attention. OpenAI's pitch is that consumer reach creates brand value and enterprise pull that competitors cannot easily replicate. Both are defensible. Which story the market prices higher will become clear when the S-1 filings land.

For now, the race to file first creates its own dynamic. An OpenAI September listing would establish a market price before Anthropic files. An Anthropic October listing would let it respond to how OpenAI's shares perform, pricing its offering above or below based on market reception. Neither sequence is decisive. What both companies share is a narrow window: AI investment appetite is strong, revenue growth is visible and measurable, and both have credible roadmaps. The era when Anthropic was the safety-focused alternative — respected, trailing in revenue — is over. The company that once worried about whether its principles would survive contact with the market has now outpaced OpenAI on the financial metrics that public investors care about most. Whether that lead holds through the first weeks of trading is the question that autumn will answer.