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WhichAI / Compare / Grok 4.5 vs GPT-5.6 Terra

Grok 4.5vsGPT-5.6 Terra

GPT-5.6 Terra scores higher on the July 16 index. Full context below: price, context window, strengths and honest limits. Verified July 26, 2026.

Grok 4.5
GPT-5.6 Terra
Provider
xAI
OpenAI
AA index
53.8
55
Released
2026-07-08
2026-07-09
Context
n/a
n/a
Price $/1M
$2 / $6
$2.5 / $15
Access
Released July 8, 2026 · API $2/$6 per 1M tokens · in Grok Build & Cursor · not yet in the EU
Released July 9, 2026 · API $2.50/$15 per 1M tokens

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Grok 4.5: xAI's first model built specifically for coding and agents (1.5T-parameter base, trained on real Cursor sessions): #4 on the AA index at a fraction of flagship prices. EU availability pending.

GPT-5.6 Terra: The balanced tier of the GPT-5.6 family - GPT-5.5-level quality at half the price. On track to become the everyday ChatGPT default.

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