Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares Gemini 3.8 Flash and DeepSeek Flash 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
Gemini 3.8 Flash vs DeepSeek Flash
DeepSeek Flash is 2.7× cheaper than Gemini 3.8 Flash: 1,000 agent calls with 10k input and 1k output tokens each cost $4.2 versus $11.25 at standard rates.
Gemini 3.8 Flash charges $0.75 input and $3.75 output per 1M tokens; DeepSeek Flash charges $0.3 and $1.2.
Their context windows are about the same size: 1.05M versus 1M tokens.
DeepSeek Flash can generate up to 384k output tokens per response, versus 66k.
Both support configurable reasoning and tool choice control in Sim.
Pricing, context window, and capabilities
API prices are per 1M tokens. Pricing last updated .
| Metric | Gemini 3.8 Flash | DeepSeek Flash |
|---|---|---|
| Provider | DeepSeek | |
| Input price | $0.75/1M | $0.3/1M |
| Cached input | $0.075/1M | $0.006/1M |
| Output price | $3.75/1M | $1.2/1M |
| Context window | 1.05M tokens | 1M tokens |
| Released | Sep 2, 2026 | Sep 10, 2026 |
| Temperature | 0 to 2 | 0 to 2 |
| Reasoning effort | Not supported | low, high, max |
| Verbosity | Not supported | Not supported |
| Thinking levels | low, medium, high (default: medium) | none, enabled (default: enabled) |
| Structured outputs | Supported | Supported |
| Tool choice | Supported | Supported |
| Computer use | Not supported | Not supported |
| Deep research | Not supported | Not supported |
| Memory support | Supported | Supported |
| Max output tokens | 66k | 384k |
Use Gemini 3.8 Flash or DeepSeek Flash 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 Flash is 2.7× cheaper than Gemini 3.8 Flash: 1,000 agent calls with 10k input and 1k output tokens each cost $4.2 versus $11.25 at standard rates. Gemini 3.8 Flash charges $0.75 input and $3.75 output per 1M tokens; DeepSeek Flash charges $0.3 and $1.2.
