GPT-6 Astra vs Grok 4.5

Price, context window & benchmark comparison

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GPT-6 Astra

OpenAI
$10.00 / $50.00
Input / Output · per 1M tokens
VS
X

Grok 4.5

xAI
$2.00 / $6.00
Input / Output · per 1M tokens
Compare different models
O
X
Verdict: Grok 4.5 is 6.7× cheaper than GPT-6 Astra on a typical 3:1 input/output mix. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (52.7 vs 38.8). GPT-6 Astra has the larger context window (1.1M vs 500K).
GPT-6 AstraGrok 4.5
Input price / 1M$10.00$2.00
Output price / 1M$50.00$6.00
Blended price (3:1)$20.00$3.00
Cached input / 1M$1.00$0.30
Context window1.1M500K
Max output128K450K
Intelligence index52.738.8
Coding index76.972.4
Providers64
Best provider uptime (30m)100.0%99.6%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-042026-07-08
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FAQ

Which is cheaper, GPT-6 Astra or Grok 4.5?

Grok 4.5 is 6.7× cheaper than GPT-6 Astra on a typical 3:1 input/output mix.

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

GPT-6 Astra: 1,050,000 tokens. Grok 4.5: 500,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-6 Astra ≈ $45,000, Grok 4.5 ≈ $7,000.

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