Claude Opus 5.5 vs Mercury 2.5

Price, context window & benchmark comparison

Anthropic

Claude Opus 5.5

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

Mercury 2.5

Inception
$0.04 / $0.15
Input / Output · per 1M tokens
Compare different models
Anthropic
Inception
Verdict: Mercury 2.5 is 118.5× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 has the larger context window (1M vs 260K).
Claude Opus 5.5Mercury 2.5
Input price / 1M$4.00$0.04
Output price / 1M$20.00$0.15
Blended price (3:1)$8.00$0.0675
Cached input / 1M$0.20$0.004
Context window1M260K
Max output128K66K
Intelligence index57.6
Coding index
Providers11
Best provider uptime (30m)100.0%
Vision inputYesNo
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-09-08
Retirement

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FAQ

Which is cheaper, Claude Opus 5.5 or Mercury 2.5?

Mercury 2.5 is 118.5× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs Mercury 2.5: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. Mercury 2.5: 260,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Mercury 2.5 ≈ $155.00.

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