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GPT-6 Luna vs MedGemma 4B IT

GPT-6 Luna leads the LLM Stats Score 44.5 to -4.5.

OpenAI · Google · Updated for 2026

Which is better?

GPT-6 Luna leads the overall LLM Stats Score 44.5 to -4.5, ranking #41 overall.

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

Choose GPT-6 Luna

  • overall performance matters — it scores 44.5 and ranks #41 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose MedGemma 4B IT

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

At a glance

The differences that matter most.

GPT-6 Luna
OpenAI
MedGemma 4B IT
Google
Core performance indexes
LLM Stats Score
44.5
#41
-4.5
#355
Reasoning
40.0
#58
-5.0
#352
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
— / M
Output price
$0.50 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-6 Luna · 7 for MedGemma 4B IT

No common benchmarks found

GPT-6 Luna and MedGemma 4B ITdon'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-6 Luna specifies input context (1,050,000 tokens). Only GPT-6 Luna specifies output context (128,000 tokens).

OpenAI
GPT-6 Luna
Input1,050,000 tokens
Output128,000 tokens
Google
MedGemma 4B IT
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Luna and MedGemma 4B IT support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-6 Luna

Text
Images
Audio
Video

MedGemma 4B IT

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-6 Luna is licensed under a proprietary license, while MedGemma 4B IT uses Health AI Developer Foundations terms of use.

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

GPT-6 Luna

Proprietary

Closed source

MedGemma 4B IT

Health AI Developer Foundations terms of use

Open weights

Release Timeline

When each model was launched

GPT-6 Luna was released on 2026-09-22, while MedGemma 4B IT was released on 2025-05-20.

GPT-6 Luna is 16 months newer than MedGemma 4B IT.

GPT-6 Luna

Sep 22, 2026

0 days ago

1.3yr newer
MedGemma 4B IT

May 20, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

GPT-6 Luna has a documented knowledge cutoff of 2026-05-18, while MedGemma 4B IT's cutoff date is not specified.

We can confirm GPT-6 Luna's training data extends to 2026-05-18, but cannot make a direct comparison without MedGemma 4B IT's cutoff date.

GPT-6 Luna

May 2026

MedGemma 4B IT

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Luna and MedGemma 4B IT side-by-side, then vote on the output you prefer.

GPT-6 Luna
✓ Preferred
MedGemma 4B IT
Open in Playground

FAQ

Common questions about GPT-6 Luna vs MedGemma 4B IT.

Which is better, GPT-6 Luna or MedGemma 4B IT?

GPT-6 Luna leads the LLM Stats Score 44.5 to -4.5. GPT-6 Luna is made by OpenAI and MedGemma 4B IT is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-6 Luna compare to MedGemma 4B IT in benchmarks?

GPT-6 Luna scores DeepSWE 1.1: 66.6%, OSWorld 2.0: 52.7%, Agents' Last Exam: 50.9%, FrontierCode 1.1: 42.4%, AutomationBench v1.0.6: 20.7%. MedGemma 4B IT scores MIMIC CXR: 88.9%, DermMCQA: 71.8%, PathMCQA: 69.8%, SlakeVQA: 62.3%, VQA-Rad: 49.9%.

What are the context window sizes for GPT-6 Luna and MedGemma 4B IT?

GPT-6 Luna supports 1.1M tokens and MedGemma 4B IT supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-6 Luna and MedGemma 4B IT?

Key differences include LLM Stats Score (44.5 vs -4.5), licensing (Proprietary vs Health AI Developer Foundations terms of use). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Luna and MedGemma 4B IT?

GPT-6 Luna is developed by OpenAI and MedGemma 4B IT is developed by Google.

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