GLM 4.5 Air vs GPT-6 Astra

Price, context window & benchmark comparison

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GLM 4.5 Air

Z.ai (Zhipu)
$0.13 / $0.85
Input / Output · per 1M tokens
VS
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GPT-6 Astra

OpenAI
$10.00 / $50.00
Input / Output · per 1M tokens
Compare different models
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Verdict: GLM 4.5 Air is 64.5× cheaper than GPT-6 Astra on a typical 3:1 input/output mix. GPT-6 Astra has the larger context window (1.1M vs 131K).
GLM 4.5 AirGPT-6 Astra
Input price / 1M$0.13$10.00
Output price / 1M$0.85$50.00
Blended price (3:1)$0.31$20.00
Cached input / 1M$0.025$1.00
Context window131K1.1M
Max output98K128K
Intelligence index52.7
Coding index76.9
Providers6
Best provider uptime (30m)100.0%
Vision inputNoYes
ReasoningYesYes
Tool callingYesYes
Released2025-07-252026-09-04
Retirement

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FAQ

Which is cheaper, GLM 4.5 Air or GPT-6 Astra?

GLM 4.5 Air is 64.5× cheaper than GPT-6 Astra on a typical 3:1 input/output mix.

GLM 4.5 Air vs GPT-6 Astra: which has a bigger context window?

GLM 4.5 Air: 131,072 tokens. GPT-6 Astra: 1,050,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GLM 4.5 Air ≈ $685.00, GPT-6 Astra ≈ $45,000.

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