> Claude Sonnet 5.5 vs Grok 4.7: index scores 193 and ~178 (GPT-4 = 100), API prices, context windows and results on the same independent tests, side by side.

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# Compare

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

[Claude Sonnet 5.5](https://themodelindex.org/models/claude-sonnet-5-5/)

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

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Next to Claude Sonnet 5.5

Best open model, measured

Kimi K3

Closest rival, another lab

GPT-6 Astra

The version it replaced

Claude Sonnet 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

[Claude Sonnet 5.5](https://themodelindex.org/models/claude-sonnet-5-5/)

193

182–205

Weights

Closed

Released

Sep 2026

Price in / out

$2.0 / $10

Context

1M

Core tests taken

3 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

–

Claude Sonnet 5.5 leads Grok 4.7 by 15 points, at 1.3× the price (one score is an estimate).

## Test by test · independent results · Epoch AI

Claude Sonnet 5.5

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/claude-sonnet-5-5-vs-grok-4-7/ · The Model Index · data as of 2026-10-01