Anthropic releases Claude Opus 4.5 after reaching a $350 billion valuation

Anthropic pushed ahead on Monday with the launch of Claude Opus 4.5, its newest model built to handle coding, computer use, and complex company tasks.

The rollout came fast, landing only weeks after the company released Claude Sonnet 4.5 in September and Claude Haiku 4.5 in October. The timing showed how the company is moving at full speed while the rest of the AI field tries to keep up.

The company, created in 2021 by former OpenAI staff, reached a valuation of roughly $350 billion last week after fresh multi‑billion‑dollar funding from Microsoft and Nvidia. The new money landed the same week the company prepared Opus 4.5, the upgraded version of the Claude Opus 4.1 model released in August.

Product chief Scott White said, “The amount that we’re releasing to the market and the feedback loops that we’re generating from it just make me so unbelievably excited,” during an interview with CNBC.

Anthropic pushes model upgrades across products

Anthropic said the ideal users for Opus 4.5 are software developers and knowledge workers such as analysts, consultants and accountants.

White said people who are “excited to push their own creativity, build new things, expand their professional purview” will also benefit from the model.

The company said Opus 4.5 shows major improvements in daily tasks. It performs better with spreadsheets, slides and deep research than earlier versions.

The company described the model as state‑of‑the‑art for agentic coding. It outperformed Google’s Gemini 3 Pro, announced last week, and OpenAI’s GPT‑5.1 on SWE‑bench Verified, a benchmark that measures coding skill.

Anthropic also tested the model on a take‑home exam used for performance engineer hiring and said Opus 4.5 scored higher than any human applicant.

Opus 4.5 will be available worldwide. It will serve as the default option for the company’s Pro, Max, and Enterprise plans. This places the new model at the center of all paid Anthropic services.

The company said this release is part of its structured family of models, with Opus being the largest tier, Sonnet the mid‑tier and Haiku the smaller option.

The launch came with a batch of product updates. Claude for Chrome, the browser extension that lets Claude take actions across tabs, is opening to all Max customers. Claude for Excel, which can read and edit spreadsheets, is now available to all Max, Team and Enterprise users.

Anthropic is also adding Claude Code to its desktop software, giving users more tools to write and adjust code locally.

The company said developers will get new features on its platform, though it did not share timing or further details. All updates rolled out on the same day as the new model, making Monday one of the company’s busiest release days in months.

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