token.app › Compare › Claude Opus 5 (Fast) vs Grok 4.5

Claude Opus 5 (Fast) vs Grok 4.5

Grok 4.5 is 6.7× cheaper per token on a blended 3:1 basis. Claude Opus 5 (Fast) accepts the larger context window (1M).

Head to head
Blended price uses a 3:1 input:output mix
Claude Opus 5 (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—
ReleasedJul 2026Jul 2026
LicenceProprietaryProprietary
Choose Claude Opus 5 (Fast) if…
  • Larger context window (1M)
  • Newer model (released Jul 2026)
Choose Grok 4.5 if…
  • Costs less per token — $3.00 vs $20.00 blended
FAQ
Which is better, Claude Opus 5 (Fast) or Grok 4.5?
We do not hold independently-run benchmark scores covering both Claude Opus 5 (Fast) and Grok 4.5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Claude Opus 5 (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 5 (Fast) and Grok 4.5 have?
Claude Opus 5 (Fast): 1,000,000 tokens. Grok 4.5: 500,000 tokens.
Who makes Claude Opus 5 (Fast) and Grok 4.5?
Claude Opus 5 (Fast) is made by Anthropic. Grok 4.5 is made by xAI.
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