Last verified 2025-09-22 (left) · 2025-11-26 (right)
Claude Opus 4.1 (Legacy) vs Grok 4.1 Fast Non-Reasoning — Pricing & Capability Comparison
Claude Opus 4.1 (Legacy) charges $15.00 per million input tokens and $75.00 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 $90.00 for Claude Opus 4.1 (Legacy) — saves $89.30 per 1M tokens
- ✓Input pricing: Claude Opus 4.1 (Legacy) $15.00/1M vs Grok 4.1 Fast Non-Reasoning $0.20/1M
- ✓Output pricing: Claude Opus 4.1 (Legacy) $75.00/1M 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 Opus 4.1 (Legacy)
$15.00
Grok 4.1 Fast Non-Reasoning
$0.20
Grok 4.1 Fast Non-Reasoning leads here
Output price (per 1M)
Claude Opus 4.1 (Legacy)
$75.00
Grok 4.1 Fast Non-Reasoning
$0.50
Grok 4.1 Fast Non-Reasoning leads here
Context window
Claude Opus 4.1 (Legacy)
200,000 tokens
Grok 4.1 Fast Non-Reasoning
2,000,000 tokens
Grok 4.1 Fast Non-Reasoning leads here
Cached input
Claude Opus 4.1 (Legacy)
Not published
Grok 4.1 Fast Non-Reasoning
$0.050
Grok 4.1 Fast Non-Reasoning leads here
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Claude Opus 4.1 (Legacy) | Grok 4.1 Fast Non-Reasoning | Grok 4.1 Fast Non-Reasoning cached |
|---|---|---|---|
Balanced conversation 50% input · 50% output | $0.450 | $0.0035 | $0.0027 |
Input-heavy workflow 80% input · 20% output | $0.270 | $0.0026 | $0.0014 |
Generation heavy 30% input · 70% output | $0.570 | $0.0041 | $0.0037 |
Cached system prompt 90% cached input · 10% fresh output | $0.210 | $0.0023 | $0.0009 |
Frequently asked questions
Which is cheaper: Claude Opus 4.1 (Legacy) 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 $15.00. For output, Grok 4.1 Fast Non-Reasoning costs $0.50 per 1M tokens versus $75.00 for Claude Opus 4.1 (Legacy).
What is the cost per 1M tokens for Claude Opus 4.1 (Legacy)?
Claude Opus 4.1 (Legacy) pricing: $15.00 per 1M input tokens and $75.00 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 Opus 4.1 (Legacy) costs $0.0150 input / $0.0750 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 Opus 4.1 (Legacy).
What is the estimated monthly cost for typical usage?
For a typical workload of 10M input + 2M output tokens per month: Claude Opus 4.1 (Legacy) would cost approximately $300.00, 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 Opus 4.1 (Legacy) does not publish cached pricing. 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.