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Gemini 4 Carbon vs GPT OSS 20B

Gemini 4 Carbon leads the LLM Stats Score 58.8 to 17.4.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 4 Carbon leads the overall LLM Stats Score 58.8 to 17.4, ranking #2 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 4 Carbon

  • overall performance matters — it scores 58.8 and ranks #2 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Oct 2026

Choose GPT OSS 20B

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Gemini 4 Carbon
Google
GPT OSS 20B
OpenAI
Core performance indexes
LLM Stats Score
58.8
#2
17.4
#254
Reasoning
54.4
#5
14.9
#264
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$0.03 / M
Output price
— / M
$0.14 / M
Context window
—
131,072

Individual benchmarks

16 reported for Gemini 4 Carbon · 7 for GPT OSS 20B

No common benchmarks found

Gemini 4 Carbon and GPT OSS 20Bdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT OSS 20B specifies input context (131,072 tokens). Only GPT OSS 20B specifies output context (131,072 tokens).

Google
Gemini 4 Carbon
Input- tokens
Output- tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output131,072 tokens
Thu Nov 05 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Gemini 4 Carbon supports multimodal inputs, whereas GPT OSS 20B does not.

Gemini 4 Carbon can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 4 Carbon

Text
Images
Audio
Video

GPT OSS 20B

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 4 Carbon 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 4 Carbon

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Gemini 4 Carbon was released on 2026-10-28, while GPT OSS 20B was released on 2025-08-05.

Gemini 4 Carbon is 15 months newer than GPT OSS 20B.

Gemini 4 Carbon

Oct 28, 2026

1 weeks ago

1.2yr newer
GPT OSS 20B

Aug 5, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 4 Carbon and GPT OSS 20B side-by-side, then vote on the output you prefer.

Gemini 4 Carbon
✓ Preferred
GPT OSS 20B
Open in Playground

FAQ

Common questions about Gemini 4 Carbon vs GPT OSS 20B.

Which is better, Gemini 4 Carbon or GPT OSS 20B?

Gemini 4 Carbon leads the LLM Stats Score 58.8 to 17.4. Gemini 4 Carbon is made by Google and GPT OSS 20B is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 4 Carbon compare to GPT OSS 20B in benchmarks?

Gemini 4 Carbon scores Gray Swan IPI Benchmark: 100.0%, Vending-Bench 2: 100.0%, Graphwalks BFS >128k: 96.2%, WebDev Arena: 88.4%, SEC-bench Pro: 88.2%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

What are the context window sizes for Gemini 4 Carbon and GPT OSS 20B?

Gemini 4 Carbon supports an unknown number of 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 4 Carbon and GPT OSS 20B?

Key differences include LLM Stats Score (58.8 vs 17.4), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Carbon and GPT OSS 20B?

Gemini 4 Carbon is developed by Google and GPT OSS 20B is developed by OpenAI.

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