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GPT OSS 20B vs Gemini 3.8 Flash

At a glance

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

131K ctx$0.02/$0.09 per M

Google's most intelligent Flash model, with significant gains over 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.

1.0M ctx$0.83/$4.13 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper98%
Reasoning & Knowledge
Graduate Science60.8%Factual Recall—
Math
Competition Math65.3%
Agentic
Terminal Tasks3.4%
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science57%95.4%Factual Recall69.7%
Math
Competition Math51%98.9%
Agentic
Terminal Tasks—
Specs
131K
Context
33K
Max output
Aug 2025
Released
1.0M
Context
66K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input98%$0.02/M tokens
Output98%$0.09/M tokens
Cache read89%$0.009/M tokens
Live pricing, shown before you run
Input$0.83/M tokens
Output$4.13/M tokens
Reasoning$4.13/M tokens
Cache read$0.08/M tokens
Cache write$0.04/M tokens
Image input$0.83/M tokens
Audio input$0.83/M tokens
Web search$0.01/search
Chat with GPT OSS 20BGo to model
Chat with Gemini 3.8 FlashGo to model
Frequently Asked Questions: GPT OSS 20B vs Gemini 3.8 Flash▼

Which is better, GPT OSS 20B or Gemini 3.8 Flash?

▼

Both GPT OSS 20B and Gemini 3.8 Flash 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 Gemini 3.8 Flash?

▼

GPT OSS 20B has a lower blended cost. GPT OSS 20B: $0.02 input / $0.09 output. Gemini 3.8 Flash: $0.83 input / $4.13 output.

Which has a larger context window, GPT OSS 20B or Gemini 3.8 Flash?

▼

Gemini 3.8 Flash has a larger context window: GPT OSS 20B supports 131K tokens vs Gemini 3.8 Flash at 1M tokens.

Do both GPT OSS 20B and Gemini 3.8 Flash support vision?

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Gemini 3.8 Flash supports vision/image input, but GPT OSS 20B does not.

What are the key differences between GPT OSS 20B and Gemini 3.8 Flash?

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Key differences: GPT OSS 20B is significantly cheaper; only Gemini 3.8 Flash 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 Gemini 3.8 Flash for free on idapt.app to see which performs better for your specific needs.

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