Model Comparison

Gemini 2.5 Flash vs GPT OSS 20B High

Both models are evenly matched across the benchmarks. GPT OSS 20B High is 4.3x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini 2.5 Flash outperforms in 1 benchmarks (GPQA), while GPT OSS 20B High is better at 1 benchmark (AIME 2025).

Both models are evenly matched across the benchmarks.

Thu Apr 16 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B High costs less

For input processing, Gemini 2.5 Flash ($0.30/1M tokens) is 3.0x more expensive than GPT OSS 20B High ($0.10/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 5.0x more expensive than GPT OSS 20B High ($0.50/1M tokens).

In conclusion, Gemini 2.5 Flash is more expensive than GPT OSS 20B High.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Apr 16 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
OpenAI
GPT OSS 20B High
Input tokens$0.10
Output tokens$0.50
Best providerOpenAI
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Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to GPT OSS 20B High's 131,072 tokens. GPT OSS 20B High can generate longer responses up to 131,072 tokens, while Gemini 2.5 Flash is limited to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT OSS 20B High
Input131,072 tokens
Output131,072 tokens
Thu Apr 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 2.5 Flash supports multimodal inputs, whereas GPT OSS 20B High does not.

Gemini 2.5 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 2.5 Flash

Text
Images
Audio
Video

GPT OSS 20B High

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash is licensed under a proprietary license, while GPT OSS 20B High uses Apache 2.0.

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

Gemini 2.5 Flash

Proprietary

Closed source

GPT OSS 20B High

Apache 2.0

Open weights

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while GPT OSS 20B High was released on 2025-08-05.

GPT OSS 20B High is 3 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

11 months ago

GPT OSS 20B High

Aug 5, 2025

8 months ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a documented knowledge cutoff of 2025-01-31, while GPT OSS 20B High's cutoff date is not specified.

We can confirm Gemini 2.5 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without GPT OSS 20B High's cutoff date.

Gemini 2.5 Flash

Jan 2025

GPT OSS 20B High

—

Provider Availability

Gemini 2.5 Flash is available from Google. GPT OSS 20B High is available from OpenAI.

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

GPT OSS 20B High

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher GPQA score (82.8% vs 74.2%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher AIME 2025 score (98.7% vs 72.0%)
GoogleGemini 2.5 Flash
OpenAIGPT OSS 20B High
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash
OpenAI
GPT OSS 20B High

FAQ

Common questions about Gemini 2.5 Flash vs GPT OSS 20B High

Both models are evenly matched across the benchmarks. Gemini 2.5 Flash is made by Google and GPT OSS 20B High is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. GPT OSS 20B High scores AIME 2025: 98.7%, GPQA: 74.2%.
GPT OSS 20B High is 3.0x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google. GPT OSS 20B High costs $0.10/M input and $0.50/M output via openai.
Gemini 2.5 Flash supports 1.0M tokens and GPT OSS 20B High supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 131K), input pricing ($0.30 vs $0.10/M), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.
Gemini 2.5 Flash is developed by Google and GPT OSS 20B High is developed by OpenAI.