Give it
- Features and bug fixes with clear requirements.
- Writing tests, filling in docs, reviewing code.
- Routine tasks you run many times a day.
Model · Anthropic
Claude Sonnet 5.5Released September 28, 2026 · Available now
Everyday work, on Sonnet 5.5.
Anthropic's model for well-scoped daily work. By Anthropic's account, it is faster than the previous Sonnet and costs less per task. In Agent.Space, pick an Agent and it is ready. No separate account needed.
Works with
In your space, pick an Agent, then pick the model.
SpecsOfficial page
- Context
- 1MToken
- Max output
- 128KToken
- Reasoning effort
- 5 levels
- Input
- Text · Image
Is it the one?
When to reach for Claude Sonnet 5.5
Matching the model to the task beats paying top price for everything.Skip it for
- Big changes with fuzzy requirements and real trade-offs: use Opus 5.5.
- Long, hard tasks that run for a long time: use Fable 5.1.
- Mechanical work like reformatting or extraction, where a smaller model will do.
In Agent.Space
Pick it and go. The rest is handled.
No separate account
No Anthropic account, no API key to set up. What you use goes on your credits or your plan.
Set the reasoning effort
Low, Medium, High, Extra high, and Maximum. The default is High. Turn it up for hard problems, down for chores.
Agents and teammates, together
In one space, Agents can hand work to each other, and teammates can step in to see the results and carry on.
Pricing
Pay for what you use. See the price live.
1 credit = US$1. This is the official pay-as-you-go price right now. If your plan includes this model, plan allowance is used first.Model pricing
Per 1M tokens · USD
Loading model prices…
FAQ
About Claude Sonnet 5.5
Use Sonnet 5.5 for daily work. Anthropic keeps Opus 5.5 for complex work that takes sustained judgment, so switch when a task keeps coming back for rework.
Yes. Claude Sonnet 5.5 is available, and Claude Code, Grok Build, and OpenCode can run it. In your space, pick an Agent, then pick the model.
No. Usage goes straight onto your Agent.Space credits or plan.
By actual usage, deducted from credits at 1 credit = US$1. The live price is in the table on this page. If your plan includes the model, plan allowance is used first, and usage moves to credits once it runs out.
Right now
Get to work with Claude Sonnet 5.5.
Pick an Agent, choose the model, and leave the rest to your space.