Last verified 2025-09-22 (left) · 2025-11-26 (right)

Claude Sonnet 4 vs Grok 4.1 Fast Non-Reasoning — Pricing & Capability Comparison

Claude Sonnet 4 charges $3.00 per million input tokens and $15.00 per million output tokens. Grok 4.1 Fast Non-Reasoning comes in at $0.20 / $0.50. Context windows span 200K vs 2M tokens respectively.

TL;DR — Quick Comparison

✓Grok 4.1 Fast Non-Reasoning is cheaper overall: $0.70 per 1M tokens (in+out) vs $18.00 for Claude Sonnet 4 — saves $17.30 per 1M tokens
✓Input pricing: Claude Sonnet 4 $3.00/1M vs Grok 4.1 Fast Non-Reasoning $0.20/1M
✓Output pricing: Claude Sonnet 4 $15.00/1M vs Grok 4.1 Fast Non-Reasoning $0.50/1M
✓Context window: Grok 4.1 Fast Non-Reasoning offers more (2M vs 200K)
✓Use our calculator below to estimate costs for your specific usage pattern

Input price (per 1M)

Claude Sonnet 4

$3.00

Grok 4.1 Fast Non-Reasoning

$0.20

Grok 4.1 Fast Non-Reasoning leads here

Output price (per 1M)

Claude Sonnet 4

$15.00

Grok 4.1 Fast Non-Reasoning

$0.50

Grok 4.1 Fast Non-Reasoning leads here

Context window

Claude Sonnet 4

200,000 tokens

Grok 4.1 Fast Non-Reasoning

2,000,000 tokens

Grok 4.1 Fast Non-Reasoning leads here

Cached input

Claude Sonnet 4

$0.300

Grok 4.1 Fast Non-Reasoning

$0.050

Grok 4.1 Fast Non-Reasoning leads here

Which one should you choose?

Skip the spreadsheet if you just need the practical takeaway. Use these rules when deciding between Claude Sonnet 4 and Grok 4.1 Fast Non-Reasoning.

Choose Grok 4.1 Fast Non-Reasoning if input tokens dominate your bill

Grok 4.1 Fast Non-Reasoning has the lower input rate, which usually matters most for chat, RAG, classification, and long-prompt workflows where prompt volume stays much larger than generated output.

Choose Grok 4.1 Fast Non-Reasoning if you generate long answers

Grok 4.1 Fast Non-Reasoning is cheaper on output tokens, so it tends to win for report generation, coding assistance, reasoning traces, and any workflow where completions are long.

Choose Grok 4.1 Fast Non-Reasoning if context size is the blocker

Grok 4.1 Fast Non-Reasoning offers the larger published context window, which is more important than small pricing differences when you need to fit large files, long chats, or multi-document prompts into one request.

Cost comparison for 10K-token workloads

Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.

Scenario	Claude Sonnet 4	Grok 4.1 Fast Non-Reasoning	Claude Sonnet 4 cached	Grok 4.1 Fast Non-Reasoning cached
Balanced conversation 50% input · 50% output	$0.0900	$0.0035	$0.0765	$0.0027
Input-heavy workflow 80% input · 20% output	$0.0540	$0.0026	$0.0324	$0.0014
Generation heavy 30% input · 70% output	$0.114	$0.0041	$0.106	$0.0037
Cached system prompt 90% cached input · 10% fresh output	$0.0420	$0.0023	$0.0177	$0.0009

Frequently asked questions

Which is cheaper: Claude Sonnet 4 or Grok 4.1 Fast Non-Reasoning?

Grok 4.1 Fast Non-Reasoning is cheaper for input tokens at $0.20 per 1M tokens compared to $3.00. For output, Grok 4.1 Fast Non-Reasoning costs $0.50 per 1M tokens versus $15.00 for Claude Sonnet 4.

What is the cost per 1M tokens for Claude Sonnet 4?

Claude Sonnet 4 pricing: $3.00 per 1M input tokens and $15.00 per 1M output tokens. Context window: 200,000 tokens.

What is the cost per 1M tokens for Grok 4.1 Fast Non-Reasoning?

Grok 4.1 Fast Non-Reasoning pricing: $0.20 per 1M input tokens and $0.50 per 1M output tokens. Context window: 2,000,000 tokens.

How much does it cost per 1K tokens?

Per 1K tokens: Claude Sonnet 4 costs $0.0030 input / $0.0150 output. Grok 4.1 Fast Non-Reasoning costs $0.0002 input / $0.0005 output. This is useful for calculating small-scale usage costs.

Which model supports a larger context window?

Grok 4.1 Fast Non-Reasoning offers 2,000,000 tokens (2M) versus 200K for Claude Sonnet 4.

What is the estimated monthly cost for typical usage?

For a typical workload of 10M input + 2M output tokens per month: Claude Sonnet 4 would cost approximately $60.00, while Grok 4.1 Fast Non-Reasoning would cost $3.00. Grok 4.1 Fast Non-Reasoning is more economical for this usage pattern.

Do these models support prompt caching?

Claude Sonnet 4 supports prompt caching at $0.300 per 1M cached tokens, reducing costs for repeated context by up to 90%. Grok 4.1 Fast Non-Reasoning supports caching at $0.050 per 1M tokens, saving up to 75%.

Which model is best for my use case?

Choose Grok 4.1 Fast Non-Reasoning for cost-sensitive applications with high input volume. Choose Grok 4.1 Fast Non-Reasoning if you need 2M context for long documents or conversations. Consider prompt caching if you have repeated context. Use our token calculator to model your specific usage pattern.