Cursor's Composer 2 shipped in March 2026 as the centerpiece of the Cursor 2.0 overhaul. The headline numbers—$0.50/1M input tokens, outperforming frontier models on SWE-bench Multilingual—look like marketing. The cache read mechanism is where the real story is.

Why a Specialized Model at All

Prior Cursor versions proxied Claude or GPT-4. Composer 2 is trained exclusively on coding data via continued pre-training and reinforcement learning. The obvious question is: what's cut?

Everything that isn't code. Composer 2 has no meaningful capability for poetry, history, ethics debates, or anything outside software development. That constraint lets Anysphere run a model that:

Understands intra-repo dependency graphs (if you fix A, B also needs updating)

Navigates hundreds of files in a single long-horizon task

Runs natively in sandboxed terminals and a built-in browser loop

Costs a fraction of what a general-purpose frontier model costs to serve

The pricing reflects this.…