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Claude 3 Opus vs Grok 3 Fast
XAnthropic · 200k context | xAI · 128k context
Cost Calculator
💰 Grok 3 Fast saves $10,500.00/month (67% cheaper)
AClaude 3 Opus
Per request$0.0525
Daily$525.00
Monthly$15,750.00
Yearly$191,625.00
XGrok 3 FastCHEAPER
Per request$0.0175
Daily$175.00
Monthly$5,250.00
Yearly$63,875.00
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Choose Claude 3 Opus when…
- ✓ Larger context window (200k vs 128k) — better for long documents
- ✓ Supports prompt caching — save up to 90% on repeated prompts
- ✓ Optimized for: Legacy complex workloads
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Choose Grok 3 Fast when…
- ✓ Cheaper for RAG & document retrieval (lower input cost)
- ✓ 67% cheaper per input token
- ✓ Cheaper for generation-heavy workloads (lower output cost)
- ✓ Optimized for: Low-latency flagship tasks