Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares GPT-6 Astra and Grok 4.7 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-6 Astra vs Grok 4.7
Grok 4.7 is 5.8× cheaper than GPT-6 Astra: 1,000 agent calls with 10k input and 1k output tokens each cost $26 versus $150 at standard rates.
GPT-6 Astra charges $10 input and $50 output per 1M tokens; Grok 4.7 charges $2 and $6.
GPT-6 Astra has a 2.1× larger context window: 1.05M versus 500k tokens.
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 | GPT-6 Astra | Grok 4.7 |
|---|---|---|
| Provider | OpenAI | xAI |
| Input price | $10/1M | $2/1M |
| Cached input | $1/1M | $0.5/1M |
| Output price | $50/1M | $6/1M |
| Long-context pricing | Above 272k input tokens, the full request is priced at $20/1M input tokens, $2/1M cached input tokens, and $75/1M output tokens. | Above 200k input tokens, the full request is priced at $4/1M input tokens, $1/1M cached input tokens, and $12/1M output tokens. |
| Context window | 1.05M tokens | 500k tokens |
| Released | Sep 3, 2026 | Sep 21, 2026 |
| Temperature | Not configurable | 0 to 2 |
| Reasoning effort | low, medium, high, xhigh, max | low, medium, high, xhigh |
| Verbosity | Not supported | 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 | Not published |
Use GPT-6 Astra or Grok 4.7 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
Grok 4.7 is 5.8× cheaper than GPT-6 Astra: 1,000 agent calls with 10k input and 1k output tokens each cost $26 versus $150 at standard rates. GPT-6 Astra charges $10 input and $50 output per 1M tokens; Grok 4.7 charges $2 and $6.
