Is Claude Opus 5.5 or Grok 4.1 Fast cheaper?

Grok 4.1 Fast is cheaper on output tokens ($0.50 vs $20.00 per 1M).

Which has the larger context window, Claude Opus 5.5 or Grok 4.1 Fast?

Grok 4.1 Fast has the larger context window (2M tokens).

Claude Opus 5.5 vs Grok 4.1 Fast

Grok 4.1 Fast is cheaper on output tokens, while Grok 4.1 Fast offers a larger context window. Choose Claude Opus 5.5 or Grok 4.1 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Opus 5.5	Grok 4.1 Fast
Provider	ZenMux	ZenMux
Input / 1M tokens	$4.00	$0.20
Output / 1M tokens	$20.00	$0.50
Context window	1M	2M
Parameters	—	—
Open weights	No	No
Released	Sep 2026	Nov 2025

Claude Opus 5.5 details →Grok 4.1 Fast details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.