Grok 4.20 vs Grok Code Fast 1

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Grok 4.20

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Grok Code Fast 1

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Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Grok 4.20

Per Request:$0.005000

Daily:$0.50

Monthly:$15.00

Yearly:$182.50

Grok Code Fast 1

Per Request:$0.000950

Daily:$0.095

Monthly:$2.85

Yearly:$34.675

Cost Differences

$0.004050

Per Request

$0.405

Daily

$12.15

Monthly

$147.825

Yearly

Grok Code Fast 1 costs less than Grok 4.20

Feature Comparison

Feature	Grok 4.20	Grok Code Fast 1
Provider	xAI	xAI
Input Price	$2.00/1M tokens	$0.20/1M tokens
Output Price	$6.00/1M tokens	$1.50/1M tokens
Context Window	2,000,000 tokens	256,000 tokens
Max Output	131,072 tokens	32,768 tokens
Category	reasoning	standard
Capabilities	textvisionreasoningcode	textcodereasoning
Release Date	2/17/2026	2/1/2026

Grok 4.20 vs Grok Code Fast 1: Which Should You Choose?

Choosing between Grok 4.20 and Grok Code Fast 1 depends on your priorities: cost efficiency, context length, or raw capability. Grok Code Fast 1 is the more affordable option at $0.20/1M input tokens — 90% cheaper than Grok 4.20. Meanwhile, Grok 4.20 offers a significantly larger context window at 2,000,000 tokens vs 256,000 for Grok Code Fast 1.

These models target different tiers: Grok 4.20 is a reasoning model while Grok Code Fast 1 is standard. This means they're optimized for different workloads. Grok 4.20 is built for complex tasks that require deeper reasoning, while Grok Code Fast 1 offers better value for routine operations.

Output costs matter too. Grok 4.20 charges $6.00/1M output tokens vs $1.50 for Grok Code Fast 1. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok Code Fast 1 has the edge here at $1.50/1M output tokens.

Multimodal capabilities: Grok 4.20 supports vision (image inputs) while Grok Code Fast 1 is text-only. If your application needs image understanding, this narrows your choice.

Best Use Cases

Choose Grok 4.20 when:

• You need a larger context window (2,000,000 tokens)
• You need more capabilities (vision)
• You need longer outputs (up to 131,072 tokens)
• You're already using xAI's API ecosystem

Choose Grok Code Fast 1 when:

• Budget is a primary concern
• You're already using xAI's API ecosystem

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Grok 4.20 (xAI)

Cost Calculator

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Grok Code Fast 1 (xAI)

Cost Calculator

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Frequently Asked Questions

Which is cheaper, Grok 4.20 or Grok Code Fast 1?▼

Grok Code Fast 1 is cheaper for input tokens at $0.20 per million tokens vs $2.00 for Grok 4.20 — that's 90% savings on input costs.

What is the context window difference between Grok 4.20 and Grok Code Fast 1?▼

Grok 4.20 supports 2,000,000 tokens while Grok Code Fast 1 supports 256,000 tokens — a difference of 1,744,000 tokens in favor of Grok 4.20.

Which model is better for AI Agent / Agentic Workflows?▼

Both models support text, code, reasoning. For ai agent / agentic workflows, Grok Code Fast 1 is the lower-cost option, while Grok 4.20 offers a larger context window (2,000,000 vs 256,000 tokens). Choose Grok Code Fast 1 for budget sensitivity or Grok 4.20 for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Grok 4.20 costs about $15.00/month and Grok Code Fast 1 costs about $2.85/month. Overall, Grok Code Fast 1 has lower combined input + output rates ($0.20 in, $1.50 out) vs Grok 4.20.