Claude Sonnet 5, Online in Genspark
Claude Sonnet 5 is Anthropic's most agentic Sonnet yet — a big step over Sonnet 4.6 on reasoning, coding, and tool use. Type a prompt below and the chat opens with Sonnet 5 already selected.
Claude Sonnet 5 is a model developed by Anthropic. Genspark is an independent AI workspace where you can use it alongside other frontier models.
What Claude Sonnet 5 Is Built For
Anthropic positions Sonnet 5 as its most agentic Sonnet — it plans, uses tools, and runs autonomously at a level that used to need much larger models. Here's what that looks like inside Genspark.
Coding and tool use
Sonnet 5 is a substantial step over Sonnet 4.6 on coding and tool use — it can hold a plan across multi-step work instead of answering one shot at a time.
Reasoning and knowledge work
Analysis, comparisons, long documents, and structured thinking — with performance Anthropic describes as close to its much larger Opus-class models.
Images and files in
In Genspark's chat, Sonnet 5 accepts images and file uploads — paste a screenshot, attach a document, and ask about it directly.
One chat, every frontier model
Genspark runs Claude Sonnet 5 alongside the other leading models. If a task fits a different engine better, switch models in the same conversation and keep your context.
How to Use Claude Sonnet 5 in Genspark
Type a prompt
Start with the input box above. Your prompt carries over, and the chat opens with Claude Sonnet 5 already selected as the model.
Add images or files
Inside the chat you can attach screenshots, photos, and documents — Sonnet 5 reads them as part of the conversation.
Compare and switch
Not sure Sonnet is the right fit for a task? Switch to another model mid-conversation and compare answers without starting over.
Frequently Asked Questions
What is Claude Sonnet 5?
Claude Sonnet 5 is Anthropic's newest Sonnet-class model, released in July 2026. Anthropic describes it as its most agentic Sonnet yet: it makes plans, uses tools like browsers and terminals, and runs autonomously at a level that previously required much larger models.
Is Claude Sonnet 5 made by Genspark?
No. Claude is developed by Anthropic. Genspark is an independent AI workspace that gives you a place to chat with Claude Sonnet 5 — alongside other frontier models — in one conversation.
How do I use Claude Sonnet 5 in Genspark?
Type a prompt in the box at the top of this page. When the chat opens, Claude Sonnet 5 is already selected as the model, so your first answer comes from Sonnet right away. It's also available in Genspark's Code Agent and Claw.
How is Sonnet 5 different from Sonnet 4.6?
Sonnet 5 is a substantial improvement over Sonnet 4.6 on reasoning, tool use, coding, and knowledge work — Anthropic positions its performance as close to the larger Opus-class models, with a focus on running agent-style tasks reliably.
Can I use Claude Fable 5 in Genspark too?
Yes — Claude Fable 5, Anthropic's Mythos-class flagship, is available in Genspark's Code Agent and Claw for accounts with data retention enabled. In the chat on this page you're using Claude Sonnet 5, and you can switch between Claude models mid-conversation.