Grok model for agentic tool use, reasoning, coding, and live assistance
Grok 4.20 Multi-Agent by xai is offered by 7 providers on this page. Its official list price is $1.25 per 1M input tokens and $2.50 per 1M output tokens. The lowest paid channel is OpenRouter at $1.25 / $2.50 per 1M, about 1.6× below the list price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it.
The context window is 1,000,000 tokens at the reference host, but hosts report different limits, from 128,000 to 2,000,000, so the usable window depends on the provider you pick. It supports reasoning and structured output. Accepted input modalities are Text, Image, and PDF. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-09-01.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| OpenRouter | Gateway | $1.25 tiered >200K: $2.50 | $2.50 | $0.20 | — | 2,000,000 ⚠ | 1,800,000 | |
| xAIOfficial grok-4.20-multi-agent-0309 | First-party | $1.25 tiered >200K: $2.50 | $2.50 | $0.20 | — | 1,000,000 | 30,000 | |
| Vercel AI Gateway | Cloud | $1.25 tiered >200K: $2.50 | $2.50 | $0.20 | — | 2,000,000 ⚠ | 2,000,000 | |
| Kilo Gateway | Gateway | $1.25 | $2.50 | $0.20 | — | 2,000,000 ⚠ | 1,800,000 | |
| Venice AI grok-4-20-multi-agent | Gateway | $1.42 tiered >200K: $2.83 | $2.83 | $0.23 | — | 2,000,000 ⚠ | 128,000 | |
| Poe | Gateway | $2.00 | $6.00 | $0.20 | — | 128,000 ⚠ | — | |
| NanoGPT | Gateway | $2.00 | $6.00 | $1.00 | — | 2,000,000 ⚠ | 131,072 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 / 7 providers expose no reasoning control (reasoning_options: []).