Claude Sonnet 5.5
AnthropicBalanced
The balanced choice for most agents.
- Pro
- Ultra
- Context window
- 1M tokens
- Max output
- 128K tokens
- Input, per 1K tokens
- 100 credits
- Output, per 1K tokens
- 500 credits
About Claude Sonnet 5.5
Speed and capability in one model. Sonnet plans, uses tools and writes well enough for most agents, from research assistants to support desks, at half the price of Opus.
Best for
- Research and writing
- Multi-step tool use
- Support and operations
Capabilities
- YesTool useWorks with the connectors you assign to its agent.
- YesStructured outputAnswers in an exact data format when a task needs one.
- YesVisionReads images such as screenshots and photos.
- YesPrompt cachingReads repeated context from the cache at a lower rate.
Effort
Effort sets how much Claude Sonnet 5.5 reasons before it answers. Higher levels give it more room to think, which can use more credits.
- Low
- Medium
- High (default)
- Extra high
- Max
Each agent can set its own level; new agents start at high.
What it costs. In credits, from your one balance.
A typical message, 8,000 tokens in, 6,000 of them read from the cache, and 800 tokens out, comes to about 660 credits on Claude Sonnet 5.5. Real messages vary with the length of the prompt and the reply.
Credits per 1K tokens
- Input
- 100
- Output
- 500
- Cache read
- 10
- Cache write
- 125
Typical messages a month
- Pro, 250,000 credits
- ≈ 378
- Ultra, 1,500,000 credits
- ≈ 2,272
Other models. Every agent can run a different one.
Questions about Claude Sonnet 5.5
How many credits does Claude Sonnet 5.5 use?
100 credits per 1K input tokens, 500 per 1K output tokens and 10 per 1K tokens read from the cache. A typical message (8,000 tokens in, 6,000 of them read from the cache, and 800 tokens out) comes to about 660 credits.
Which plans include Claude Sonnet 5.5?
Pro and Ultra. On Pro, the 250,000 monthly credits cover about 378 typical messages. On Ultra, the 1,500,000 monthly credits cover about 2,272 typical messages.
How much can Claude Sonnet 5.5 read and write?
It reads up to 1M tokens of context in a request and writes up to 128K tokens in one reply.
Can Claude Sonnet 5.5 work with images?
Yes. It takes images as input alongside text, so an agent can read the screenshots and photos you send it.
What does the effort setting do?
Effort sets how much Claude Sonnet 5.5 reasons before it answers. It offers low, medium, high, extra high, and max, and agents start at high. Higher effort gives it more room to think, which can mean more output tokens and so more credits.