Claude Opus 5.5 vs o3 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
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o3 Pro

OpenAI
$20.00 / $80.00
Input / Output · per 1M tokens
Compare different models
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Verdict: Claude Opus 5.5 is 4.4× cheaper than o3 Pro on a typical 3:1 input/output mix. Claude Opus 5.5 has the larger context window (1M vs 200K).
Claude Opus 5.5o3 Pro
Input price / 1M$4.00$20.00
Output price / 1M$20.00$80.00
Blended price (3:1)$8.00$35.00
Cached input / 1M$0.20
Context window1M200K
Max output128K100K
Intelligence index57.6
Coding index
Providers11
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222025-06-10
Retirement

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FAQ

Which is cheaper, Claude Opus 5.5 or o3 Pro?

Claude Opus 5.5 is 4.4× cheaper than o3 Pro on a typical 3:1 input/output mix.

Claude Opus 5.5 vs o3 Pro: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. o3 Pro: 200,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, o3 Pro ≈ $80,000.

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