Model Comparison

GPT-5.6 Terra vs o1-proWhich is better in 2026?

GPT-5.6 Terra significantly outperforms across most benchmarks.

Verdict: GPT-5.6 Terra vs o1-pro — which is better?

GPT-5.6 Terra (by OpenAI) and o1-pro (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.

GPT-5.6 Terra outperforms in 1 benchmarks (GPQA), while o1-pro 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 o1-pro if…

  • you are already invested in the OpenAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.6 Terra outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.

GPT-5.6 Terra significantly outperforms across most benchmarks.

Sun Jul 19 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
OpenAI
o1-pro
Input- tokens
Output- tokens
Sun Jul 19 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.6 Terra and o1-pro support multimodal inputs.

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

GPT-5.6 Terra

Text
Images
Audio
Video

o1-pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5.6 Terra

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.6 Terra was released on 2026-07-09, while o1-pro was released on 2024-12-17.

GPT-5.6 Terra is 19 months newer than o1-pro.

GPT-5.6 Terra

Jul 9, 2026

1 weeks ago

1.6yr newer
o1-pro

Dec 17, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

GPT-5.6 Terra has a knowledge cutoff of 2026-02-16, while o1-pro has a cutoff of 2023-09-30.

GPT-5.6 Terra has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

GPT-5.6 Terra

Feb 2026

2.4 yr newer
o1-pro

Sep 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (1,050,000 tokens)
Higher GPQA score (92.9% vs 79.0%)
OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.6 Terra and o1-pro side-by-side, then vote on the output you prefer.

GPT-5.6 Terra
✓ Preferred
o1-pro
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.6 Terra
OpenAI
o1-pro

FAQ

Common questions about GPT-5.6 Terra vs o1-pro.

Which is better, GPT-5.6 Terra or o1-pro?

GPT-5.6 Terra significantly outperforms across most benchmarks. GPT-5.6 Terra is made by OpenAI and o1-pro is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.6 Terra compare to o1-pro 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%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for GPT-5.6 Terra and o1-pro?

GPT-5.6 Terra supports 1.1M tokens and o1-pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Related comparisons