> GPT-5.6 Terra vs Grok 4.7: index scores 178 and ~178 (GPT-4 = 100), API prices, context windows and results on the same independent tests, side by side.

Up to four models

# Compare

Side by side on the same independent tests, with price and context. The link in your address bar shares this exact comparison.

[GPT-5.6 Terra](https://themodelindex.org/models/gpt-5-6-terra/)

[Grok 4.7](https://themodelindex.org/models/grok-4-7/)

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Next to GPT-5.6 Terra

Cheapest at this level

MiMo-V2.6-Pro

Best open model, measured

Kimi K3

Stronger for the same price

Claude Sonnet 5.5

Where it started

GPT-4

Presets

Best open vs best closed (measured)

Today vs GPT-4 (2023)

Top three labs

US vs China, best of each

[GPT-5.6 Terra](https://themodelindex.org/models/gpt-5-6-terra/)

178

167–189

Weights

Closed

Released

Jul 2026

Price in / out

$2.0 / $12

Context

1.05M

Core tests taken

4 of 8

[Grok 4.7](https://themodelindex.org/models/grok-4-7/)

~178

estimated

Weights

Closed

Released

Sep 2026

Price in / out

$2.0 / $6.0

Context

500K

Core tests taken

–

GPT-5.6 Terra and Grok 4.7 are too close to call (0 points apart, within the uncertainty), at 1.5× the price (one score is an estimate).

## Test by test · independent results · Epoch AI

GPT-5.6 Terra

Grok 4.7

These models share no independent tests yet.

Only tests that at least two of these models have taken. Bold rows are the core tests shown on every profile; all of these results inform the index score. Task length (METR) is listed below the chart because it is a duration, not a percentage.

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Source: https://themodelindex.org/compare/gpt-5-6-terra-vs-grok-4-7/ · The Model Index · data as of 2026-10-01