Model Comparison

GPT-5.6 Luna vs Granite 3.3 8B BaseWhich is better in 2026?

Comparing GPT-5.6 Luna and Granite 3.3 8B Base across benchmarks, pricing, and capabilities.

Verdict: GPT-5.6 Luna vs Granite 3.3 8B Base — which is better?

GPT-5.6 Luna (by OpenAI) and Granite 3.3 8B Base (by IBM) 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.

Choose GPT-5.6 Luna if…

  • you want the most recent training data — it shipped Jul 2026

Choose Granite 3.3 8B Base if…

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

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT-5.6 Luna and Granite 3.3 8B Basedon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.6 Luna specifies input context (1,050,000 tokens). Only GPT-5.6 Luna specifies output context (128,000 tokens).

OpenAI
GPT-5.6 Luna
Input1,050,000 tokens
Output128,000 tokens
IBM
Granite 3.3 8B Base
Input- tokens
Output- tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.6 Luna and Granite 3.3 8B Base support multimodal inputs.

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

GPT-5.6 Luna

Text
Images
Audio
Video

Granite 3.3 8B Base

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.6 Luna is licensed under a proprietary license, while Granite 3.3 8B Base uses Apache 2.0.

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

GPT-5.6 Luna

Proprietary

Closed source

Granite 3.3 8B Base

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-5.6 Luna was released on 2026-07-09, while Granite 3.3 8B Base was released on 2025-04-16.

GPT-5.6 Luna is 15 months newer than Granite 3.3 8B Base.

GPT-5.6 Luna

Jul 9, 2026

1 weeks ago

1.2yr newer
Granite 3.3 8B Base

Apr 16, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

GPT-5.6 Luna has a knowledge cutoff of 2026-02-16, while Granite 3.3 8B Base has a cutoff of 2024-04-01.

GPT-5.6 Luna has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to Granite 3.3 8B Base (2024-04-01).

GPT-5.6 Luna

Feb 2026

1.8 yr newer
Granite 3.3 8B Base

Apr 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (1,050,000 tokens)
IBM
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.6 Luna and Granite 3.3 8B Base side-by-side, then vote on the output you prefer.

GPT-5.6 Luna
✓ Preferred
Granite 3.3 8B Base
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.6 Luna
IBM
Granite 3.3 8B Base

FAQ

Common questions about GPT-5.6 Luna vs Granite 3.3 8B Base.

Which is better, GPT-5.6 Luna or Granite 3.3 8B Base?

GPT-5.6 Luna (OpenAI) and Granite 3.3 8B Base (IBM) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GPT-5.6 Luna compare to Granite 3.3 8B Base in benchmarks?

GPT-5.6 Luna scores Connectors: 99.9%, HealthBench Consensus: 95.1%, GPQA: 92.3%, Search and Function-Calling: 89.7%, Capture-the-Flag Challenges (Internal): 85.2%. Granite 3.3 8B Base scores HumanEval: 89.7%, AttaQ: 88.5%, HumanEval+: 86.1%, AIME 2024: 81.2%, HellaSwag: 80.1%.

What are the context window sizes for GPT-5.6 Luna and Granite 3.3 8B Base?

GPT-5.6 Luna supports 1.1M tokens and Granite 3.3 8B Base 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-5.6 Luna and Granite 3.3 8B Base?

Key differences include licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.6 Luna and Granite 3.3 8B Base?

GPT-5.6 Luna is developed by OpenAI and Granite 3.3 8B Base is developed by IBM.

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