Anthropic's $350B Valuation Surge: Code Opus 4.5 or Just Opus?

Anthropic’s valuation nearly tripled in six months to $350 billion—without releasing a single product to the public. The AI lab, preparing to become Silicon Valley’s most valuable private company, reported a $10 billion funding round at this valuation, according to Wall Street Journal (1/2/2026). This follows a $183 billion valuation in October 2025 during its Series F round.

Key investors include hedge fund Coatue Management and Singapore’s GIC. Separately, Anthropic secured a $15 billion partnership with Microsoft and NVIDIA, involving $30 billion in compute purchases.

The company’s developer-focused Claude Code (internally called Code Opus 4.5) is positioned as a driver for adoption, though practical availability remains unclear—no public pricing or free tier details were disclosed.

A developer on Reddit noted: "Claude Code sounds promising, but without GitHub integration or open APIs, it’s hard to see how it competes with OpenAI’s Codex." This highlights a gap between Anthropic’s claims and measurable developer adoption metrics.

Meanwhile, OpenAI is also rumored to be preparing for an IPO, with a $750 billion valuation and $100 billion in fundraising reported.