Claude Opus 4.5 vs Grok 4.1 Fast Reasoning
Claude Opus 4.5 vs Grok 4.1 Fast Reasoning: Grok 4.1 Fast Reasoning is cheaper by 98% on average. Claude Opus 4.5 from Azure AI Foundry (200,000-token context, reasoning, tool calls) vs. Grok 4.1 Fast Reasoning from xAI (2,000,000-token context, reasoning, tool calls). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.
Side-by-side cost
Live workload comparison
Same workload run through both models. The cheaper one is highlighted.
3,000
02,000,000
400
0200,000
5,000
01,000,000
At this workload, Grok 4.1 Fast Reasoning is 97% cheaper than Claude Opus 4.5 — a savings of $3,683/month ($44,195/year).
Production recipe — Agent Command Center
strategy: cost-optimized
primary:
model: grok-4-1-fast-reasoning
provider: xai
fallback:
model: claude-opus-4-5
provider: azure-ai-foundry
shadow: { sample_rate: 0.05 } # mirror 5% of traffic to compare quality live| Claude Opus 4.5 | Grok 4.1 Fast Reasoning | |
|---|---|---|
| Input price | $5.00/M | $0.200/M |
| Output price | $25.00/M | $0.500/M |
| Context window | 200,000 | 2,000,000 |
| Max output | 64,000 | 2,000,000 |
| Function calling | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio input | — | ✓ |
| Reasoning | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Pricing verified | May 12, 2026 | May 12, 2026 |
Benchmark comparison
Side-by-side public benchmark scores. Greener bar = winner.
Chatbot Arena ELOgeneral
Claude Opus 4.5
1,472
Grok 4.1 Fast Reasoning
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