Model Comparison

Gemini 1.5 Pro vs GPT OSS 20BWhich is better in 2026?

Both models are evenly matched across the benchmarks. GPT OSS 20B is 50.0x cheaper per token.

Verdict: Gemini 1.5 Pro vs GPT OSS 20B — which is better?

Gemini 1.5 Pro (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 1.5 Pro outperforms in 1 benchmarks (MMLU), while GPT OSS 20B is better at 1 benchmark (GPQA). Both models are evenly matched across the benchmarks.

On price, GPT OSS 20B is roughly 50.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 1.5 Pro also accepts a larger context window (2,097,152 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 1.5 Pro if…

  • you process long inputs — it offers a 2,097,152 token context window

Choose GPT OSS 20B if…

  • cost matters — it's about 50.0x 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 1.5 Pro outperforms in 1 benchmarks (MMLU), while GPT OSS 20B is better at 1 benchmark (GPQA).

Both models are evenly matched across the 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 1.5 Pro ($2.50/1M tokens) is 50.0x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, Gemini 1.5 Pro ($10.00/1M tokens) is 50.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, Gemini 1.5 Pro 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 1.5 Pro
Input tokens$2.50
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 1.5 Pro accepts 2,097,152 input tokens compared to GPT OSS 20B's 131,072 tokens. GPT OSS 20B can generate longer responses up to 32,768 tokens, while Gemini 1.5 Pro is limited to 8,192 tokens.

Google
Gemini 1.5 Pro
Input2,097,152 tokens
Output8,192 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 1.5 Pro supports multimodal inputs, whereas GPT OSS 20B does not.

Gemini 1.5 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 1.5 Pro

Text
Images
Audio
Video

GPT OSS 20B

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 1.5 Pro 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 1.5 Pro

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Gemini 1.5 Pro was released on 2024-05-01, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 15 months newer than Gemini 1.5 Pro.

Gemini 1.5 Pro

May 1, 2024

2.1 years ago

GPT OSS 20B

Aug 5, 2025

10 months ago

1.3yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Pro has a documented knowledge cutoff of 2023-11-01, while GPT OSS 20B's cutoff date is not specified.

We can confirm Gemini 1.5 Pro's training data extends to 2023-11-01, but cannot make a direct comparison without GPT OSS 20B's cutoff date.

Gemini 1.5 Pro

Nov 2023

GPT OSS 20B

—

Provider Availability

Gemini 1.5 Pro is available from Google. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

Gemini 1.5 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput 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

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (2,097,152 tokens)
Supports multimodal inputs
Higher MMLU score (85.9% vs 85.3%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher GPQA score (71.5% vs 59.1%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 1.5 Pro
OpenAI
GPT OSS 20B

FAQ

Common questions about Gemini 1.5 Pro vs GPT OSS 20B.

Which is better, Gemini 1.5 Pro or GPT OSS 20B?

Both models are evenly matched across the benchmarks. Gemini 1.5 Pro 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 1.5 Pro compare to GPT OSS 20B in benchmarks?

Gemini 1.5 Pro scores XSTest: 98.8%, FLEURS: 93.3%, HellaSwag: 93.3%, GSM8k: 90.8%, BIG-Bench Hard: 89.2%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is Gemini 1.5 Pro cheaper than GPT OSS 20B?

GPT OSS 20B is 50.0x cheaper for input tokens. Gemini 1.5 Pro costs $2.50/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 1.5 Pro and GPT OSS 20B?

Gemini 1.5 Pro supports 2.1M 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 1.5 Pro and GPT OSS 20B?

Key differences include context window (2.1M vs 131K), input pricing ($2.50 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 1.5 Pro and GPT OSS 20B?

Gemini 1.5 Pro is developed by Google and GPT OSS 20B is developed by OpenAI.

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