Model Comparison
GPT-5.1 Thinking vs Grok-2 Image 1212Which is better in 2026?
Comparing GPT-5.1 Thinking and Grok-2 Image 1212 across benchmarks, pricing, and capabilities.
Verdict: GPT-5.1 Thinking vs Grok-2 Image 1212 — which is better?
GPT-5.1 Thinking (by OpenAI) and Grok-2 Image 1212 (by xAI) 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-5.1 Thinking also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose GPT-5.1 Thinking if…
- you process long inputs — it offers a 400,000 token context window
- you want the most recent training data — it shipped Nov 2025
Choose Grok-2 Image 1212 if…
- you are already invested in the xAI ecosystem
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.1 Thinking and Grok-2 Image 1212don'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
GPT-5.1 Thinking accepts 400,000 input tokens compared to Grok-2 Image 1212's 131,072 tokens. Only GPT-5.1 Thinking specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
GPT-5.1 Thinking supports multimodal inputs, whereas Grok-2 Image 1212 does not.
GPT-5.1 Thinking can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.1 Thinking
Grok-2 Image 1212
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.1 Thinking was released on 2025-11-12, while Grok-2 Image 1212 was released on 2024-12-12.
GPT-5.1 Thinking is 11 months newer than Grok-2 Image 1212.
Nov 12, 2025
8 months ago
11mo newerDec 12, 2024
1.7 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT-5.1 Thinking is available from OpenAI. Grok-2 Image 1212 is available from xAI.
GPT-5.1 Thinking
Grok-2 Image 1212
Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.1 Thinking and Grok-2 Image 1212 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.1 Thinking vs Grok-2 Image 1212.