Claude Opus 5.5 Is Now Live on Emergent

Claude Opus 5.5, Anthropic's newest Opus model, is now available on Emergent. You can select it as your model when you start a build, the same day Anthropic shipped it. Anthropic positions Opus 5.5 as its leading model for agentic coding, says it matches Claude Fable 5.1 on most tasks, and reports it generates output more than 30% faster than Opus 5.

If you build on Emergent, that means the newest flagship is already in your model picker, tagged as new, with nothing to install or wait for.

How to use Opus 5.5 on Emergent

Pick Claude Opus 5.5 from the model selector when you start or continue a project. It appears in the prompt bar's model dropdown alongside the other supported models, so switching to it takes one selection rather than any setup. Access runs through the Universal LLM Key, the single credential Emergent uses for every supported model, so there is no separate Anthropic key to manage.

The model is available to all Emergent users now. Describe what you want to build in plain language, choose Opus 5.5, and the agent plans, writes, and deploys the app from that conversation.

What Opus 5.5 brings to a build

Opus 5.5 is built for the kind of long, multi-step work that app building demands, and it does that work faster than the model before it. Anthropic reports output generation more than 30% faster than Opus 5, which shows up directly in how quickly an agent moves through a plan-write-deploy loop. Anthropic also positions it as its strongest model for agentic coding and computer use, the exact tasks an Emergent agent runs on your behalf.

The efficiency story matters most on real projects. Anthropic says Opus 5.5 costs 40% less to run than Opus 5 on typical workloads at default settings, because it uses fewer tokens per task on top of lower per-token prices. For a builder, cheaper and faster runs mean more iteration on the same idea before you ship. Emergent covered the full launch for readers who want the complete rundown of what changed.

Why same-day availability matters

Getting the newest flagship on launch day means you build with current capability instead of waiting on a rollout. Model quality is the ceiling on what an agent can build for you, so a better underlying model raises what is possible in a single Emergent session. Opus 5.5 shipped on September 22, 2026 as the first model in a new Claude 5.5 family, and it is selectable on Emergent from day one.

For anyone building an app that leans on a model for hours at a stretch, that immediacy is the point. You can start building on Emergent and choose Claude Opus 5.5 as your model right now. The newest Opus is on the table, and the only thing left is to describe what you want to make.