Grok 4.20 (Reasoning)

A high-performance model with industry-leading speed and agentic tool calling capabilities.

xAIgrok-4.20-0309-reasoning2026-03-10Report incorrect data

Specs

Context: 1M
Max output: —
Input price: $1.25/ 1M tokens
Output price: $2.5/ 1M tokens
Released: 2026-03-10

Context

Context window: 1M
Max input: —
Max output: —

Pricing · USD / 1M tokens

Input: $1.25
Output: $2.5
Cache read: $0.2
Cache write: —

Modalities

Input: TextImage
Output: Text

API

API types: chatresponsesbatch

Reasoning

Reasoning: Yes
Levels: —

Info

Status: Active
Released: 2026-03-10
Knowledge cutoff: —

Features

Confirmed: toolsstructured_outputcachingbatch

How to call

xaimodel = grok-4.20-0309-reasoning

chat

POSThttps://api.x.ai/v1/chat/completions

responses

POSThttps://api.x.ai/v1/responses

JSON

grok-4.20-0309-reasoning.json

{
  "id": "grok-4.20-0309-reasoning",
  "object": "model",
  "created": 1773100800,
  "owned_by": "xai",
  "name": "Grok 4.20 (Reasoning)",
  "api": {
    "types": [
      "chat",
      "responses",
      "batch"
    ]
  },
  "limits": {
    "context": 1000000,
    "input": null,
    "output": null
  },
  "modalities": {
    "input": [
      "text",
      "image"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": []
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 1.25,
    "output": 2.5,
    "cache_read": 0.2,
    "cache_write": null
  },
  "features": [
    "tools",
    "structured_output",
    "caching",
    "batch"
  ],
  "info": {
    "status": "active",
    "release_date": "2026-03-10",
    "knowledge_cutoff": null,
    "description": "A high-performance model with industry-leading speed and agentic tool calling capabilities.",
    "docs": "https://docs.x.ai/developers/models/grok-4.20-0309-reasoning",
    "verified_at": "2026-10-11"
  }
}

Official sources