> GPT-5.6 Terra vs Kimi K3: index scores 178 and 172 (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/)

[Kimi K3](https://themodelindex.org/models/kimi-k3/)

Add model

Next to GPT-5.6 Terra

Cheapest at this level

MiMo-V2.6-Pro

Closest rival, another lab

Grok 4.7

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

[Kimi K3](https://themodelindex.org/models/kimi-k3/)

172

161–183

Weights

Open

Released

Jul 2026

Price in / out

$0.68 / $10

Context

1.05M

Core tests taken

4 of 8

GPT-5.6 Terra leads Kimi K3 by 6 points, ahead on 4 of 4 shared core tests, at 1.5× the price.

## Test by test · independent results · Epoch AI

GPT-5.6 Terra

Kimi K3

_Chart: Test results for the selected models_

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.

---
Source: https://themodelindex.org/compare/gpt-5-6-terra-vs-kimi-k3/ · The Model Index · data as of 2026-10-01