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Kimi K3 vs GPT OSS 20B

At a glance
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
OpenAIGPT OSS 20B

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

131K ctx$0.03/$0.14 per M
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
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%
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%
Specs
MoonshotAIKimi K3
1.0M
Context
16K
Max output
Jul 2026
Released
OpenAIGPT OSS 20B
131K
Context
16K
Max output
Aug 2025
Released
Capabilities
MoonshotAIKimi K3
Vision
Audio
Reasoning
OpenAIGPT OSS 20B
Vision
Audio
Reasoning
Pricing
MoonshotAIKimi K3
Live pricing, shown before you run
Input$3.00/M tokens
Output$15.00/M tokens
Cache read$0.30/M tokens
OpenAIGPT OSS 20B
Live pricing, shown before you run
Input$0.03/M tokens
Output$0.14/M tokens
Chat with Kimi K3Go to model
Chat with GPT OSS 20BGo to model
Frequently Asked Questions: Kimi K3 vs GPT OSS 20B▼

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

▼

Both Kimi K3 and GPT OSS 20B 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, Kimi K3 or GPT OSS 20B?

▼

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

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

▼

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

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

▼

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

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

▼

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 Kimi K3 and GPT OSS 20B for free on idapt.app to see which performs better for your specific needs.

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