token.app › Compare › Claude Opus 4.8 (Fast) vs Grok 4.5

Claude Opus 4.8 (Fast) vs Grok 4.5

Grok 4.5 is 6.7× cheaper per token on a blended 3:1 basis. Claude Opus 4.8 (Fast) accepts the larger context window (1M).

Head to head
Blended price uses a 3:1 input:output mix
Claude Opus 4.8 (Fast)Grok 4.5
ProviderAnthropicxAI
Input $/1M$10.00$2.00
Output $/1M$50.00$6.00
Blended $/1M$20.00$3.00
Context window1M500K
Max output128K—
ReleasedMay 2026Jul 2026
LicenceProprietaryProprietary
Choose Claude Opus 4.8 (Fast) if…
  • Larger context window (1M)
Choose Grok 4.5 if…
  • Costs less per token — $3.00 vs $20.00 blended
  • Newer model (released Jul 2026)
FAQ
Which is better, Claude Opus 4.8 (Fast) or Grok 4.5?
We do not hold independently-run benchmark scores covering both Claude Opus 4.8 (Fast) and Grok 4.5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Claude Opus 4.8 (Fast) cheaper than Grok 4.5?
Grok 4.5 is cheaper: $3.00 versus $20.00 per million tokens blended at 3:1 input:output. Input alone: $10.00 vs $2.00. Output alone: $50.00 vs $6.00.
What context windows do Claude Opus 4.8 (Fast) and Grok 4.5 have?
Claude Opus 4.8 (Fast): 1,000,000 tokens. Grok 4.5: 500,000 tokens.
Who makes Claude Opus 4.8 (Fast) and Grok 4.5?
Claude Opus 4.8 (Fast) is made by Anthropic. Grok 4.5 is made by xAI.
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