Claude Opus 5.5 vs Grok 4.20

Price, context window & benchmark comparison

A

Claude Opus 5.5

Anthropic
$4.00 / $20.00
Input / Output · per 1M tokens
VS
X

Grok 4.20

xAI
$1.25 / $2.50
Input / Output · per 1M tokens
Compare different models
A
X
Verdict: Grok 4.20 is 5.1× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Grok 4.20 has the larger context window (2M vs 1M).
Claude Opus 5.5Grok 4.20
Input price / 1M$4.00$1.25
Output price / 1M$20.00$2.50
Blended price (3:1)$8.00$1.56
Cached input / 1M$0.20$0.20
Context window1M2M
Max output128K1.8M
Intelligence index57.6—
Coding index——
Providers11—
Best provider uptime (30m)100.0%—
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-03-31
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Opus 5.5 or Grok 4.20?

Grok 4.20 is 5.1× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs Grok 4.20: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. Grok 4.20: 2,000,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Grok 4.20 ≈ $3,750.

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