Model Comparison

Gemini 2.5 Pro Preview 06-05 vs GPT OSS 20BWhich is better in 2026?

Gemini 2.5 Pro Preview 06-05 significantly outperforms across most benchmarks. GPT OSS 20B is 39.3x cheaper per token.

Verdict: Gemini 2.5 Pro Preview 06-05 vs GPT OSS 20B — which is better?

Gemini 2.5 Pro Preview 06-05 (by Google) and GPT OSS 20B (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Gemini 2.5 Pro Preview 06-05 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT OSS 20B is better at 0 benchmarks. Gemini 2.5 Pro Preview 06-05 significantly outperforms across most benchmarks.

On price, GPT OSS 20B is roughly 39.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 2.5 Pro Preview 06-05 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 2.5 Pro Preview 06-05 if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you process long inputs — it offers a 1,048,576 token context window

Choose GPT OSS 20B if…

  • cost matters — it's about 39.3x cheaper per token
  • you want the most recent training data — it shipped Aug 2025
  • you need open weights you can self-host or fine-tune
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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini 2.5 Pro Preview 06-05 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT OSS 20B is better at 0 benchmarks.

Gemini 2.5 Pro Preview 06-05 significantly outperforms across most benchmarks.

Wed Jun 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens) is 25.0x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens) is 50.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, Gemini 2.5 Pro Preview 06-05 is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Wed Jun 24 2026 • llm-stats.com
Google
Gemini 2.5 Pro Preview 06-05
Input tokens$1.25
Output tokens$10.00
Best providerGoogle
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 2.5 Pro Preview 06-05 accepts 1,048,576 input tokens compared to GPT OSS 20B's 131,072 tokens. Gemini 2.5 Pro Preview 06-05 can generate longer responses up to 65,535 tokens, while GPT OSS 20B is limited to 32,768 tokens.

Google
Gemini 2.5 Pro Preview 06-05
Input1,048,576 tokens
Output65,535 tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Wed Jun 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 2.5 Pro Preview 06-05 supports multimodal inputs, whereas GPT OSS 20B does not.

Gemini 2.5 Pro Preview 06-05 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 2.5 Pro Preview 06-05

Text
Images
Audio
Video

GPT OSS 20B

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Pro Preview 06-05 is licensed under a proprietary license, while GPT OSS 20B uses Apache 2.0.

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

Gemini 2.5 Pro Preview 06-05

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 2 months newer than Gemini 2.5 Pro Preview 06-05.

Gemini 2.5 Pro Preview 06-05

Jun 5, 2025

1.1 years ago

GPT OSS 20B

Aug 5, 2025

10 months ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Pro Preview 06-05 has a documented knowledge cutoff of 2025-01-31, while GPT OSS 20B's cutoff date is not specified.

We can confirm Gemini 2.5 Pro Preview 06-05's training data extends to 2025-01-31, but cannot make a direct comparison without GPT OSS 20B's cutoff date.

Gemini 2.5 Pro Preview 06-05

Jan 2025

GPT OSS 20B

—

Provider Availability

Gemini 2.5 Pro Preview 06-05 is available from Google. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

Gemini 2.5 Pro Preview 06-05

google logo
Google
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

GPT OSS 20B

novita logo
Novita
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
fireworks logo
Fireworks
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
groq logo
Groq
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
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 (86.4% vs 71.5%)
Higher Humanity's Last Exam score (21.6% vs 10.9%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Pro Preview 06-05
OpenAI
GPT OSS 20B

FAQ

Common questions about Gemini 2.5 Pro Preview 06-05 vs GPT OSS 20B.

Which is better, Gemini 2.5 Pro Preview 06-05 or GPT OSS 20B?

Gemini 2.5 Pro Preview 06-05 significantly outperforms across most benchmarks. Gemini 2.5 Pro Preview 06-05 is made by Google and GPT OSS 20B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 2.5 Pro Preview 06-05 compare to GPT OSS 20B in benchmarks?

Gemini 2.5 Pro Preview 06-05 scores Global-MMLU-Lite: 89.2%, AIME 2025: 88.0%, FACTS Grounding: 87.8%, GPQA: 86.4%, VideoMMMU: 83.6%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is Gemini 2.5 Pro Preview 06-05 cheaper than GPT OSS 20B?

GPT OSS 20B is 25.0x cheaper for input tokens. Gemini 2.5 Pro Preview 06-05 costs $1.25/M input and $10.00/M output via google. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita.

What are the context window sizes for Gemini 2.5 Pro Preview 06-05 and GPT OSS 20B?

Gemini 2.5 Pro Preview 06-05 supports 1.0M tokens and GPT OSS 20B supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 2.5 Pro Preview 06-05 and GPT OSS 20B?

Key differences include context window (1.0M vs 131K), input pricing ($1.25 vs $0.05/M), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Pro Preview 06-05 and GPT OSS 20B?

Gemini 2.5 Pro Preview 06-05 is developed by Google and GPT OSS 20B is developed by OpenAI.

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