Grok 4.20
Summary
Grok 4.20 is a language model from xAI, released on 31 Mar 2026. It accepts text, images and files and generates text, with a 2M-token context window and up to 1.8M output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.25 per million input tokens and $2.50 per million output tokens (OpenRouter), across 1 provider we track.
Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | xAI |
|---|---|
| Release date | 31 Mar 2026 [OpenRouter] |
| Status | Generally available |
| Context window | 2M (2,000,000 tokens) [OpenRouter] |
| Max output | 1.8M tokens [OpenRouter] |
| Knowledge cutoff | 1 Sept 2025 [OpenRouter] |
| Input | Text, images and files [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | Yes [OpenRouter] |
Grok 4.20 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter x-ai/grok-4.20 | $1.25 | $2.50 | $0.20 | 2M | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Grok 4.20?
Grok 4.20 has a context window of 2,000,000 tokens (2M) and can generate up to 1,800,000 tokens in a single response, according to OpenRouter.
How much does the Grok 4.20 API cost?
Grok 4.20 is listed from $1.25 per million input tokens and $2.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
When was Grok 4.20 released?
xAI released Grok 4.20 on 31 Mar 2026, according to OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.