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Claude Opus 4.8 vs Grok 3 Fast

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Anthropic · 1M context  |  xAI · 128k context

Pricing Comparison

MetricClaude Opus 4.8Grok 3 Fast
Input / 1M tokens$5$5
Output / 1M tokens$25$25
Cached input / 1M$0.5—
Context window1M128k
ProviderAnthropicxAI

Cost Calculator

AClaude Opus 4.8
Per request$0.0175
Daily$175.00
Monthly$5,250.00
Yearly$63,875.00
XGrok 3 Fast
Per request$0.0175
Daily$175.00
Monthly$5,250.00
Yearly$63,875.00
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Choose Claude Opus 4.8 when…

  • ✓ Larger context window (1M vs 128k) — better for long documents
  • ✓ Supports prompt caching — save up to 90% on repeated prompts
  • ✓ Optimized for: Complex reasoning & coding
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Choose Grok 3 Fast when…

  • ✓ Optimized for: Low-latency flagship tasks

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