GLM 5.3 Flash vs GPT-5.6 Luna

Price, context window & benchmark comparison

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GLM 5.3 Flash

Z.ai (Zhipu)
$0.15 / $0.50
Input / Output · per 1M tokens
VS
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GPT-5.6 Luna

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
Compare different models
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Verdict: GLM 5.3 Flash is 47% cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix. GLM 5.3 Flash scores higher on the Artificial Analysis Intelligence Index (41.8 vs 37.3). GLM 5.3 Flash has the larger context window (1.3M vs 1.1M).
GLM 5.3 FlashGPT-5.6 Luna
Input price / 1M$0.15$0.20
Output price / 1M$0.50$1.20
Blended price (3:1)$0.24$0.45
Cached input / 1M$0.05$0.02
Context window1.3M1.1M
Max output944K128K
Intelligence index41.837.3
Coding index71.571.4
Providers317
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-08-262026-07-09
Retirement——

Cost calculator

FAQ

Which is cheaper, GLM 5.3 Flash or GPT-5.6 Luna?

GLM 5.3 Flash is 47% cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix.

GLM 5.3 Flash vs GPT-5.6 Luna: which has a bigger context window?

GLM 5.3 Flash: 1,310,720 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: GLM 5.3 Flash ≈ $550.00, GPT-5.6 Luna ≈ $1,000.

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