Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares GPT-5 and GPT-4.1 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
GPT-5 vs GPT-4.1
GPT-5 is 1.2× cheaper than GPT-4.1: 1,000 agent calls with 10k input and 1k output tokens each cost $22.5 versus $28 at standard rates.
GPT-5 charges $1.25 input and $10 output per 1M tokens; GPT-4.1 charges $2 and $8.
GPT-4.1 has a 2.6× larger context window: 1.05M versus 400k tokens.
GPT-5 can generate up to 128k output tokens per response, versus 33k.
Only GPT-5 supports configurable reasoning in Sim.
Pricing, context window, and capabilities
API prices are per 1M tokens. Pricing last updated .
| Metric | GPT-5 | GPT-4.1 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input price | $1.25/1M | $2/1M |
| Cached input | $0.125/1M | $0.5/1M |
| Output price | $10/1M | $8/1M |
| Context window | 400k tokens | 1.05M tokens |
| Released | Aug 7, 2025 | Apr 14, 2025 |
| Temperature | Not configurable | 0 to 2 |
| Reasoning effort | minimal, low, medium, high | Not supported |
| Verbosity | low, medium, high | Not supported |
| Thinking levels | Not supported | Not supported |
| 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 | 128k | 33k |
Use GPT-5 or GPT-4.1 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
GPT-5 is 1.2× cheaper than GPT-4.1: 1,000 agent calls with 10k input and 1k output tokens each cost $22.5 versus $28 at standard rates. GPT-5 charges $1.25 input and $10 output per 1M tokens; GPT-4.1 charges $2 and $8.
