Claude Opus 5.5 vs o1

Price, context window & benchmark comparison

A

Claude Opus 5.5

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

o1

OpenAI
$15.00 / $60.00
Input / Output · per 1M tokens
Compare different models
A
O
Verdict: Claude Opus 5.5 is 3.3× cheaper than o1 on a typical 3:1 input/output mix. Claude Opus 5.5 has the larger context window (1M vs 200K).
Claude Opus 5.5o1
Input price / 1M$4.00$15.00
Output price / 1M$20.00$60.00
Blended price (3:1)$8.00$26.25
Cached input / 1M$0.20$7.50
Context window1M200K
Max output128K100K
Intelligence index57.6—
Coding index—39.7
Providers11—
Best provider uptime (30m)100.0%—
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222024-12-17
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Opus 5.5 or o1?

Claude Opus 5.5 is 3.3× cheaper than o1 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs o1: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. o1: 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, o1 ≈ $60,000.

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