Use Claude Sonnet 5 in Chrome
Anthropic built Claude Sonnet 5 to be its most agentic Sonnet model yet. One shortcut on any page, your own OpenRouter key, provider prices.
Get it for $49
What Claude Sonnet 5 is good at
Three jobs it does well from the launcher, and what comes back when you run them.
Questions about docs pages
Ask what a function on a docs page does without leaving the tab you are reading.
What it can read
Each tool only reads or calculates. History and copied text start off.
Long issue threads
Summarize a long issue thread in one pass and get the decision instead of the noise.
Rewriting a draft
Turn a blunt draft into something you can send, in the tone you name.
What it costs in your browser
Pay OpenRouter per token. UtilEngine adds nothing.
OpenRouter lists Claude Sonnet 5 at $2 for a million input tokens and $10 for a million output tokens. A page of text is a few thousand tokens, so most of what you do in a browser costs cents, not dollars.
At list price a $20 month buys about 1,800 long-article summaries. You are not buying a month, though. You pay for the tokens each job uses, and the rest of your OpenRouter balance just sits there.
The extension asks OpenRouter for the fastest route, which can be a faster route at a higher rate than the one this receipt is priced on. When that route wins, the same three jobs cost about 1.1x what you see here, and your OpenRouter activity page shows what you were actually charged.
Claude Sonnet 5 or Claude Sonnet 5.5
Two models from the same list, side by side, with what each one is for.
Pick it for commands you already tuned on Sonnet 5
Pick it for the same work, 30% faster
Switch between them per command.See how
Switch models mid-chat
Set a default for chat, another for Ask AI, and a different one for any command.
A model for every job
Match each job to the model that suits it.
85 models, one key
Seven providers in the same picker. OpenRouter bills each one at its own rate.
How to use Claude Sonnet 5 in Chrome
A free key, one paste, and the model shows up everywhere the AI runs.
Create an OpenRouter key
One free key reaches Claude Sonnet 5 and every other model in the list.
Paste it in AI Settings
Open AI Settings and paste the key once. It stays in this browser and never syncs.
Pick Claude Sonnet 5
Set it for chat, for Ask AI, or for a single command. Switch again whenever you like.
Claude Sonnet 5, answered
Is Claude Sonnet 5 available in UtilEngine today?
Yes. It is in the list as claude-sonnet-5 and calls anthropic/claude-sonnet-5 through OpenRouter with OpenRouter's :nitro speed routing, which the extension uses for every Anthropic model.
What does Claude Sonnet 5 cost through UtilEngine?
Nothing beyond the one-time $49 for the extension. OpenRouter lists Sonnet 5 at $2 per million input tokens and $10 per million output, which puts a page summary near a cent. The extension routes for speed, so a faster route can serve the request at up to $2.20 per million in and $11 out. Each reply shows the tokens it used, not counting web searches.
Do I need an Anthropic account?
No. Your OpenRouter key covers Sonnet 5 alongside every other model in the list, and the credit sits in your OpenRouter account.
Can I use Sonnet 5 for one command and a cheaper model for another?
Yes. The model is stored per command, so Sonnet 5 can drive Rewrite As while Fix Spelling and Grammar runs on GLM 5.3 Flash.
Does the AI act on pages?
No. Every tool it can call reads, from page text and your selection to your tabs and the web, and each call shows as a chip in the answer. It never clicks, types or submits a form.
Claude Sonnet 5, one keystroke away
Chat, Ask AI, and your own commands on any page, in a launcher with 50+ built in.
Get it for $49One-time payment. 14-day refund, no questions asked.