Claude Opus 5.5 vs Gemini 2.5 Pro

Price, context window & benchmark comparison

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Claude Opus 5.5

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

Gemini 2.5 Pro

Google
$1.25 / $10.00
Input / Output · per 1M tokens
Compare different models
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Verdict: Gemini 2.5 Pro is 2.3× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 16.1). Gemini 2.5 Pro has the larger context window (1M vs 1M).
Claude Opus 5.5Gemini 2.5 Pro
Input price / 1M$4.00$1.25
Output price / 1M$20.00$10.00
Blended price (3:1)$8.00$3.44
Cached input / 1M$0.20$0.13
Context window1M1M
Max output128K66K
Intelligence index57.616.1
Coding index33.3
Providers11
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222025-06-17
Retirement2026-10-20

Cost calculator

FAQ

Which is cheaper, Claude Opus 5.5 or Gemini 2.5 Pro?

Gemini 2.5 Pro is 2.3× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

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

Claude Opus 5.5: 1,000,000 tokens. Gemini 2.5 Pro: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Gemini 2.5 Pro ≈ $7,500.

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