Grok 4.20: API price, context window and how to connect
Grok 4.20 by xAI (SpaceXAI): $1.25 per million input tokens, $2.5 per million output tokens, a 2M-token window. What it is good for, what to compare it with and how to connect it in SKILLOK.
In this article
In short#
A SpaceXAI reasoning model focused on speed and tool calling. According to the developer it has the lowest hallucination rate and strict prompt adherence. A 2-million-token window.
Specifications#
| Provider | xAI (SpaceXAI) |
| Released | 2026-03-31 |
| Context window | 2M tokens |
| Accepts | text, images, files |
| Answers with | text |
| Reasoning mode | yes |
| Tool calling | yes |
| Open weights | no |
| Knowledge up to | 2025-09 |
| Identifier | x-ai/grok-4.20 |
Price#
| Per 1M tokens | In dollars |
|---|---|
| Input (question, context) | $1.25 |
| Output (answer) | $2.5 |
For reference: a conversation of 20 questions of ~500 tokens and answers of ~800 tokens costs about $0.052. Models in reasoning mode spend more tokens on an answer than the text shows: the reasoning is paid for too.
What it is good for#
- Very long context
- Fast agents with tools
- Answers where making things up is costly
Similar models#
Catalog models with the same kind of output, closest in the price of a typical request.
| Model | Input | Output | Window | Price |
|---|---|---|---|---|
| Grok 4.3 | $1.25 | $2.5 | 1M | about the same |
| Kimi K2.6 | $0.65 | $3.41 | 262K | about the same |
| Kimi K2.7 Code | $0.671 | $3.35 | 262K | about the same |
| Gemini 3.8 Flash | $0.825 | $4.125 | 1.05M | 1.2× more expensive |
| DeepSeek V4 Pro 0423 | $0.955 | $1.911 | 1.05M | 1.3× cheaper |
Other xAI (SpaceXAI) models#
How to connect in SKILLOK#
Grok 4.20 works through OpenRouter: add an OpenRouter key in Settings → AI and pick the x-ai/grok-4.20 model. It then becomes available in Space AI, in tasks and to the repository agent. In detail — Connecting a model in SKILLOK.
Where the data comes from#
Prices, the context window and capabilities come from the public OpenRouter catalog as of 2026-10-19. A provider may change the price — the exact figure is always on the model's OpenRouter page.
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