Model Comparison

GPT-5.6 Terra vs Phi-3.5-MoE-instructWhich is better in 2026?

GPT-5.6 Terra significantly outperforms across most benchmarks.

Verdict: GPT-5.6 Terra vs Phi-3.5-MoE-instruct — which is better?

GPT-5.6 Terra (by OpenAI) and Phi-3.5-MoE-instruct (by Microsoft) 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.

GPT-5.6 Terra outperforms in 1 benchmarks (GPQA), while Phi-3.5-MoE-instruct is better at 0 benchmarks. GPT-5.6 Terra significantly outperforms across most benchmarks.

Choose GPT-5.6 Terra if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose Phi-3.5-MoE-instruct if…

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

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.6 Terra outperforms in 1 benchmarks (GPQA), while Phi-3.5-MoE-instruct is better at 0 benchmarks.

GPT-5.6 Terra significantly outperforms across most benchmarks.

Sat Jul 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

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

OpenAI
GPT-5.6 Terra
Input1,050,000 tokens
Output128,000 tokens
Microsoft
Phi-3.5-MoE-instruct
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.6 Terra supports multimodal inputs, whereas Phi-3.5-MoE-instruct does not.

GPT-5.6 Terra can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.6 Terra

Text
Images
Audio
Video

Phi-3.5-MoE-instruct

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.6 Terra is licensed under a proprietary license, while Phi-3.5-MoE-instruct uses MIT.

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

GPT-5.6 Terra

Proprietary

Closed source

Phi-3.5-MoE-instruct

MIT

Open weights

Release Timeline

When each model was launched

GPT-5.6 Terra was released on 2026-07-09, while Phi-3.5-MoE-instruct was released on 2024-08-23.

GPT-5.6 Terra is 23 months newer than Phi-3.5-MoE-instruct.

GPT-5.6 Terra

Jul 9, 2026

1 weeks ago

1.9yr newer
Phi-3.5-MoE-instruct

Aug 23, 2024

1.9 years ago

Knowledge Cutoff

When training data ends

GPT-5.6 Terra has a documented knowledge cutoff of 2026-02-16, while Phi-3.5-MoE-instruct's cutoff date is not specified.

We can confirm GPT-5.6 Terra's training data extends to 2026-02-16, but cannot make a direct comparison without Phi-3.5-MoE-instruct's cutoff date.

GPT-5.6 Terra

Feb 2026

Phi-3.5-MoE-instruct

—

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,050,000 tokens)
Supports multimodal inputs
Higher GPQA score (92.9% vs 36.8%)
Microsoft
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.6 Terra and Phi-3.5-MoE-instruct side-by-side, then vote on the output you prefer.

GPT-5.6 Terra
✓ Preferred
Phi-3.5-MoE-instruct
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.6 Terra
Microsoft
Phi-3.5-MoE-instruct

FAQ

Common questions about GPT-5.6 Terra vs Phi-3.5-MoE-instruct.

Which is better, GPT-5.6 Terra or Phi-3.5-MoE-instruct?

GPT-5.6 Terra significantly outperforms across most benchmarks. GPT-5.6 Terra is made by OpenAI and Phi-3.5-MoE-instruct is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.6 Terra compare to Phi-3.5-MoE-instruct in benchmarks?

GPT-5.6 Terra scores Connectors: 100.0%, HealthBench Consensus: 95.1%, Search and Function-Calling: 94.6%, GPQA: 92.9%, Capture-the-Flag Challenges (Internal): 91.8%. Phi-3.5-MoE-instruct scores ARC-C: 91.0%, OpenBookQA: 89.6%, GSM8k: 88.7%, PIQA: 88.6%, RULER: 87.1%.

What are the context window sizes for GPT-5.6 Terra and Phi-3.5-MoE-instruct?

GPT-5.6 Terra supports 1.1M tokens and Phi-3.5-MoE-instruct 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 Terra and Phi-3.5-MoE-instruct?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.6 Terra and Phi-3.5-MoE-instruct?

GPT-5.6 Terra is developed by OpenAI and Phi-3.5-MoE-instruct is developed by Microsoft.

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