As of 10/08/2025, the Diamond name has been deprecated, and AI code review capabilities now slot under Graphite Agent.

Graphite's bet on AI-powered code review

Generative AI is accelerating coding—but what happens next? How do you ensure those AI-generated changes are reviewed, tested, and deployed safely? To unlock the full productivity gains of AI-native IDEs (e.g. Windsurf, Cursor, GitHub Copilot) and autonomous dev agents (e.g. Cognition, Claude Code) today’s teams also need AI in the review, testing, and deployment processes. The future of this “outer loop” is a hybrid model, where humans and AI agents collaborate to achieve more without compromising on quality.

At Graphite, we’re leading the way with an AI-powered code review platform that gives developers feedback on every code change in seconds, automatically summarizes pull requests, turns comments into actionable code suggestions, and self-heals failing CI. Underneath all of this, Graphite delivers the same state-of-the-art workflow and toolchain used by Meta and Google: stacked PRs, automated reviewer assignment, a powerful, stack-aware merge queue, and detailed productivity analytics (SEI). The result is a seamless, end-to-end code review platform that’s helping industry-leading companies like Shopify, Snowflake, Figma, and Perplexity ship faster than ever.

This is just the beginning. Today, we’re excited to announce our $52 million Series B, led by Accel, with participation from Menlo Ventures via its Anthology Fund with Anthropic, Shopify Ventures, and Figma Ventures, as well as returning investors Andreessen Horowitz (a16z) and The General Partnership.

“As AI transforms software development, Graphite is the go-to tool for the world’s most forward-thinking engineering teams. It’s becoming the canonical layer where humans and agents collaborate on code—and continuing the legacy of Accel’s investments in modern, design-centric devtools like Linear and Vercel," Christine Esserman, Partner at Accel.

Introducing Diamond: the AI code review agent for the world’s fastest teams

We believe every pull request at every software company should be reviewed by AI agents and human developers working together, and today we’re taking a big step towards realizing this vision. Graphite’s AI-powered code review companion has quickly become a trusted tool for hundreds of the world’s fastest-moving software teams, reviewing tens of thousands of pull requests every week. Building on this success, and fueled by our new round of funding, we’re excited to announce that our AI reviewer is now a standalone product: Diamond.

Diamond delivers instant, high-signal feedback on every pull request, catching bugs, logic errors, style inconsistencies, security vulnerabilities, and more. It ships with powerful features to understand and augment your team’s code review process, including:

• Customizable rules: Enforce your team’s unique coding patterns by importing your own style guide.

• Comment settings: Enhance clarity by filtering out unwanted comments, ensuring a focused, high signal-low noise review experience.

• Codebase awareness: Improve comment quality with context gathered directly from your codebase.

• Review insights: Access analytics on comment metrics, including issue categories.

• Suggested fixes: Accept code improvements with a single click.

• Universal GitHub integration: Works in any repository, whether or not you have a Graphite plan.

Diamond is free for up to 100 PRs reviewed per month and can be purchased separate of a Graphite subscription.

Menlo Ventures participated in the round through their Anthology Fund, a $100M initiative launched in 2024 with Anthropic. “As AI code generation advances, AI code review is becoming increasingly critical. With the launch of Diamond, Graphite has set a new standard for AI code review, ensuring teams can trust and scale AI-generated code with confidence,” Rama Sekhar, Partner at Menlo Ventures. 

Massive thanks to our customers, investors, and team for supporting us on this journey. We are proud to be an indispensable platform for thousands of high-velocity engineering teams, and we can’t wait to keep building for them.

If you’re excited about reimagining software development with a deeply talented 30-person, NYC-based team, we’re hiring for many open roles across the company. Apply here.