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Kimi K2.8 Preview vs Step3-VL-10B

Comparing Kimi K2.8 Preview and Step3-VL-10B across benchmarks, pricing, and capabilities.

Moonshot AI · StepFun · Updated for 2026

Which is better?

Kimi K2.8 Preview and Step3-VL-10B trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Kimi K2.8 Preview

  • you want the most recent training data — it shipped Sep 2026

Choose Step3-VL-10B

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Kimi K2.8 Preview
Moonshot AI
Step3-VL-10B
StepFun
Benchmark wins
—
—
Input price
— / M
— / M
Output price
— / M
— / M
Context window
1,048,576
—

Individual benchmarks

0 reported for Kimi K2.8 Preview · 6 for Step3-VL-10B

No common benchmarks found

Kimi K2.8 Preview and Step3-VL-10Bdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Kimi K2.8 Preview specifies input context (1,048,576 tokens).

Moonshot AI
Kimi K2.8 Preview
Input1,048,576 tokens
Output- tokens
StepFun
Step3-VL-10B
Input- tokens
Output- tokens
Mon Sep 21 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Kimi K2.8 Preview and Step3-VL-10B support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Kimi K2.8 Preview

Text
Images
Audio
Video

Step3-VL-10B

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2.8 Preview is licensed under a proprietary license, while Step3-VL-10B uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

Kimi K2.8 Preview

Proprietary

Closed source

Step3-VL-10B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Kimi K2.8 Preview was released on 2026-09-11, while Step3-VL-10B was released on 2026-01-15.

Kimi K2.8 Preview is 8 months newer than Step3-VL-10B.

Kimi K2.8 Preview

Sep 11, 2026

1 weeks ago

7mo newer
Step3-VL-10B

Jan 15, 2026

8 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Kimi K2.8 Preview and Step3-VL-10B side-by-side, then vote on the output you prefer.

Kimi K2.8 Preview
✓ Preferred
Step3-VL-10B
Open in Playground

FAQ

Common questions about Kimi K2.8 Preview vs Step3-VL-10B.

Which is better, Kimi K2.8 Preview or Step3-VL-10B?

Kimi K2.8 Preview (Moonshot AI) and Step3-VL-10B (StepFun) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Kimi K2.8 Preview compare to Step3-VL-10B in benchmarks?

Step3-VL-10B scores MMBench: 91.8%, AIME 2025: 87.7%, MathVista: 84.0%, MMMU: 78.1%, MathVision: 70.8%.

What are the context window sizes for Kimi K2.8 Preview and Step3-VL-10B?

Kimi K2.8 Preview supports 1.0M tokens and Step3-VL-10B supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2.8 Preview and Step3-VL-10B?

Key differences include licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.8 Preview and Step3-VL-10B?

Kimi K2.8 Preview is developed by Moonshot AI and Step3-VL-10B is developed by StepFun.

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