Chat with Grok 4.20 for free
Grok 4.20 is xAI's fast non-reasoning model, with a 2M-token context window, strict prompt adherence and a low hallucination rate. Start typing, no sign-up needed.
See how Grok 4.20 thinks
Pick a task and watch a sample answer stream in. Open the same prompt in Chatday when you’re ready.
The bug is in the arrow body: u.id = id assigns instead of compares, so the callback returns the assigned value and .find never matches the way you expect.
Fix it with a strict comparison:
Use === to compare. A single = is assignment, which is why you saw undefined.
What makes Grok 4.20 stand out
Grok 4.20 specifications
| Provider | xAI |
| Model family | Grok 4 series |
| Context window | 2,000,000 tokens |
| Max output | 2,000,000 tokens |
| Modality | Text · Vision |
| Input price | $1.25 / 1M tokens |
| Output price | $2.5 / 1M tokens |
| Tool / function calling | Yes |
| Vision | Yes |
| Streaming | Yes |
| Available in Chatday | Free & Pro |
Pricing shown for reference; usage is included in your Chatday plan.
Grok 4.20 vs other top models
| Model | Context | Best at | Input price | In Chatday |
|---|---|---|---|---|
| Grok 4.20 | 2M | Long-context | $1.25/M | Free |
| Gemini 4 Argon | 1M | Frontier coding | $2/M | Free |
| GPT-6.1 | 1.1M | Agentic coding | $2/M | Free |
| Claude Opus 5.5 | 1M | Flagship reasoning | $4/M | Free |
Grok 4.20 questions
Other models
Gemini 4 Argon
Gemini 4 Argon is Google's new frontier model for real-world coding and knowledge work, with a 1M-token window and long-form output.
GPT-6.1
GPT-6.1 is OpenAI's newest flagship for agentic coding, computer use and professional work, with a 1M-token context and configurable reasoning.
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's new flagship for agentic coding and knowledge work, with a 1M-token context and lower prices than Opus 5.
Chat with Grok 4.20 and switch models any time.
One subscription, every leading model. Start free in the Chatday web app.