> Step 5 Preview vs Kimi K3: index scores ~175 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.

[Step 5 Preview](https://themodelindex.org/models/step-5-preview/)

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

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Next to Step 5 Preview

Cheapest at this level

MiMo-V2.6-Pro

Closest rival, another lab

GPT-5.6 Terra

The version it replaced

Step 3

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

[Step 5 Preview](https://themodelindex.org/models/step-5-preview/)

~175

estimated

Weights

Closed

Released

Sep 2026

Price in / out

–

Context

–

Core tests taken

–

[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

Step 5 Preview and Kimi K3 are too close to call (3 points apart, within the uncertainty) (one score is an estimate).

## Test by test · independent results · Epoch AI

Step 5 Preview

Kimi K3

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/step-5-preview-vs-kimi-k3/ · The Model Index · data as of 2026-10-01