Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares Claude Sonnet 5.5 and Claude Sonnet 4.6 on API pricing per 1M tokens, context window, max output, and capabilities. Both models are available in the Sim Agent block, and each Agent block in a Sim agent can use a different model.
API model comparison
Claude Sonnet 5.5 vs Claude Sonnet 4.6
Claude Sonnet 5.5 is 1.5× cheaper than Claude Sonnet 4.6: 1,000 agent calls with 10k input and 1k output tokens each cost $30 versus $45 at standard rates.
Claude Sonnet 5.5 charges $2 input and $10 output per 1M tokens; Claude Sonnet 4.6 charges $3 and $15.
Both models have a 1M token context window.
Both can generate up to 128k output tokens per response.
Both support configurable reasoning, tool choice control, and native structured outputs in Sim.
Pricing, context window, and capabilities
API prices are per 1M tokens. Pricing last updated .
| Metric | Claude Sonnet 5.5 | Claude Sonnet 4.6 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input price | $2/1M | $3/1M |
| Cached input | $0.1/1M | $0.3/1M |
| Output price | $10/1M | $15/1M |
| Context window | 1M tokens | 1M tokens |
| Released | Sep 28, 2026 | Feb 17, 2026 |
| Temperature | Not configurable | 0 to 1 |
| Reasoning effort | Not supported | Not supported |
| Verbosity | Not supported | Not supported |
| Thinking levels | low, medium, high, xhigh, max (default: high) | low, medium, high, max (default: high) |
| Structured outputs | Supported (native) | Supported (native) |
| Tool choice | Supported | Supported |
| Computer use | Not supported | Not supported |
| Deep research | Not supported | Not supported |
| Memory support | Supported | Supported |
| Max output tokens | 128k | 128k |
Use Claude Sonnet 5.5 or Claude Sonnet 4.6 in a Sim agent
Both models are available in the Sim Agent block. Pick either one from the model picker, and each Agent block in the same agent can use a different model.
Frequently asked questions
Claude Sonnet 5.5 is 1.5× cheaper than Claude Sonnet 4.6: 1,000 agent calls with 10k input and 1k output tokens each cost $30 versus $45 at standard rates. Claude Sonnet 5.5 charges $2 input and $10 output per 1M tokens; Claude Sonnet 4.6 charges $3 and $15.
