Claude Opus 5 vs GPT-5.6 Luna

Price, context window & benchmark comparison

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Claude Opus 5

Anthropic
$5.00 / $25.00
Input / Output · per 1M tokens
VS
O

GPT-5.6 Luna

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna is 22.2× cheaper than Claude Opus 5 on a typical 3:1 input/output mix. Claude Opus 5 scores higher on the Artificial Analysis Intelligence Index (50.8 vs 37.3). GPT-5.6 Luna has the larger context window (1.1M vs 1M).
Claude Opus 5GPT-5.6 Luna
Input price / 1M$5.00$0.20
Output price / 1M$25.00$1.20
Blended price (3:1)$10.00$0.45
Cached input / 1M$0.50$0.02
Context window1M1.1M
Max output128K128K
Intelligence index50.837.3
Coding index7871.4
Providers117
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-242026-07-09
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Opus 5 or GPT-5.6 Luna?

GPT-5.6 Luna is 22.2× cheaper than Claude Opus 5 on a typical 3:1 input/output mix.

Claude Opus 5 vs GPT-5.6 Luna: which has a bigger context window?

Claude Opus 5: 1,000,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5 ≈ $22,500, GPT-5.6 Luna ≈ $1,000.

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