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GPT OSS 20B vs Kimi K3

At a glance
OpenAIGPT OSS 20B

OpenAI's compact open-weights model for efficient inference.

131K ctx$0.03/$0.14 per M
MoonshotAIKimi K3

MoonshotAI's 2.8T-parameter flagship for complex coding, knowledge work, and long-horizon agent runs.

1.0M ctx$3.00/$15.00 per M
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
OpenAIGPT OSS 20B
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Reasoning & Knowledge
Graduate Science—Expert-Level—
Agentic
Terminal Tasks3.4%
MoonshotAIKimi K3
Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-16
Reasoning & Knowledge
Graduate Science93.5%Expert-Level43.5%
Agentic
Terminal Tasks88.3%
Specs
OpenAIGPT OSS 20B
131K
Context
16K
Max output
Aug 2025
Released
MoonshotAIKimi K3
1.0M
Context
16K
Max output
Jul 2026
Released
Capabilities
OpenAIGPT OSS 20B
Vision
Audio
Reasoning
MoonshotAIKimi K3
Vision
Audio
Reasoning
Pricing
OpenAIGPT OSS 20B
Live pricing, shown before you run
Input$0.03/M tokens
Output$0.14/M tokens
MoonshotAIKimi K3
Live pricing, shown before you run
Input$3.00/M tokens
Output$15.00/M tokens
Cache read$0.30/M tokens
Chat with GPT OSS 20BGo to model
Chat with Kimi K3Go to model
Frequently Asked Questions: GPT OSS 20B vs Kimi K3▼

Which is better, GPT OSS 20B or Kimi K3?

▼

Both GPT OSS 20B and Kimi K3 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT OSS 20B or Kimi K3?

▼

GPT OSS 20B has a lower blended cost. GPT OSS 20B: $0.03 input / $0.14 output. Kimi K3: $3.00 input / $15.00 output.

Which has a larger context window, GPT OSS 20B or Kimi K3?

▼

Kimi K3 has a larger context window: GPT OSS 20B supports 131K tokens vs Kimi K3 at 1M tokens.

Do both GPT OSS 20B and Kimi K3 support vision?

▼

Kimi K3 supports vision/image input, but GPT OSS 20B does not.

What are the key differences between GPT OSS 20B and Kimi K3?

▼

Key differences: GPT OSS 20B is significantly cheaper; only Kimi K3 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT OSS 20B and Kimi K3 for free on idapt.app to see which performs better for your specific needs.

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