Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares Claude Opus 5.5 and DeepSeek V4 Pro 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 Opus 5.5 vs DeepSeek V4 Pro
DeepSeek V4 Pro is 3.5× cheaper than Claude Opus 5.5: 1,000 agent calls with 10k input and 1k output tokens each cost $17.16 versus $60 at standard rates.
Claude Opus 5.5 charges $4 input and $20 output per 1M tokens; DeepSeek V4 Pro charges $1.32 and $3.96.
Both models have a 1M token context window.
DeepSeek V4 Pro can generate up to 384k output tokens per response, versus 128k.
Only Claude Opus 5.5 supports native structured outputs in Sim.
Pricing, context window, and capabilities
API prices are per 1M tokens. Pricing last updated .
| Metric | Claude Opus 5.5 | DeepSeek V4 Pro |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Input price | $4/1M | $1.32/1M |
| Cached input | $0.2/1M | $0.044/1M |
| Output price | $20/1M | $3.96/1M |
| Context window | 1M tokens | 1M tokens |
| Released | Sep 22, 2026 | Apr 24, 2026 |
| Temperature | Not configurable | Not configurable |
| Reasoning effort | Not supported | low, high, max |
| Verbosity | Not supported | Not supported |
| Thinking levels | low, medium, high, xhigh, max (default: medium) | none, enabled (default: enabled) |
| Structured outputs | Supported (native) | Supported |
| Tool choice | Supported | Supported |
| Computer use | Not supported | Not supported |
| Deep research | Not supported | Not supported |
| Memory support | Supported | Supported |
| Max output tokens | 128k | 384k |
Use Claude Opus 5.5 or DeepSeek V4 Pro 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
DeepSeek V4 Pro is 3.5× cheaper than Claude Opus 5.5: 1,000 agent calls with 10k input and 1k output tokens each cost $17.16 versus $60 at standard rates. Claude Opus 5.5 charges $4 input and $20 output per 1M tokens; DeepSeek V4 Pro charges $1.32 and $3.96.
