Grok 4.20 Reasoning: API pricing, context window and capabilities

Prices from official vendor price lists · October 2026

Grok 4.20 Reasoning costs $1.25 per 1M input tokens and $2.5 per 1M output tokens, with a 1M context window. Mid-priced: dearer than 55% of this rating, with Grok Build 0.1 as the nearest cheaper xAI option. Recorded for vision, reasoning, adjustable thinking.

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Capabilities

API $/1M (in / out)

$1.25 / $2.5

Context window

1M tokens

Price / mo

API only

Overview Reviews

Grok 4.20 Reasoning is an AI model from xAI, priced at $1.25 input and $2.5 output per 1M tokens. That places it in the mid tier of this rating — dearer than 55% of the 205 priced models listed.

It holds 1M tokens in a single conversation, enough for a full codebase or a contract bundle in one pass. Capabilities recorded in this rating: text & chat, vision, reasoning, adjustable thinking, web search grounding. Access is through the API rather than a consumer subscription.

API price$1.25 / $2.5per 1M tokens, in / out

Context1M tokenstokens per conversation

VendorxAIall models from this vendor

TierMiddearer than 55% of models

Cost calculator

1M tokens/mo10M tokens/mo50M tokens/mo200M tokens/mo

Standard$2.19~~AED 8 per month~~

With batch −50%$1.09~~AED 4 per month~~

With caching on input$1.91~~AED 7 per month~~

Standard$21.88~~AED 80 per month~~

With batch −50%$10.94~~AED 40 per month~~

With caching on input$19.06~~AED 70 per month~~

Standard$109~~AED 402 per month~~

With batch −50%$54.69~~AED 201 per month~~

With caching on input$95.31~~AED 350 per month~~

Standard$438~~AED 1,607 per month~~

With batch −50%$219~~AED 803 per month~~

With caching on input$381~~AED 1,400 per month~~

Assumes a 1:3 input-to-output ratio, which is typical for chat and generation. Dirham figures use 3.6725 per dollar. Batch and caching discounts apply where the vendor offers them.

Compared with alternatives

How Grok 4.20 Reasoning sits against its neighbours in this rating. Tap a card to open that model.

Qwen3.5-122B-A10B

Cheaper

Alibaba (Qwen)

$0.29 / $2.4262.1K tokens

Grok 4.3

Closest match

xAI

$1.25 / $2.51M tokens

Good and poor fit

Good fit

Multi-step analysis, planning and code review, where the first plausible answer is often wrong.
Reading screenshots, charts, scanned documents and photos.
Whole codebases, contract bundles and long transcripts in a single pass.

Related filters

Text & chat234 models for text generation and chat

Vision159 models that read images

Reasoning175 models that think before answering

Adjustable thinking85 models with a reasoning depth dial

Tool calling172 models that call your functions

xAI8 models from this vendor

All 245 modelsThe full rating with filters and prices

Frequently asked questions

How much does Grok 4.20 Reasoning cost?

$1.25 / $2.5 per 1M tokens, input and output. In dirhams that is roughly AED 4.59 per 1M input tokens. Batch processing halves it where the vendor offers it.

What is the context window of Grok 4.20 Reasoning?

1M tokens in a single conversation.

What can Grok 4.20 Reasoning do?

In this rating it is recorded with: text & chat, vision, reasoning, adjustable thinking, web search grounding, tool calling, structured JSON output, long context 1M+, prompt caching, batch API, priority / fast tier, multilingual, proprietary API.

Is Grok 4.20 Reasoning a good choice?

It depends on the job. See the good-fit and poor-fit lists above, and compare against the neighbouring models before committing.

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