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GPT-5.1 Instant vs Grok-2 Image 1212

Comparing GPT-5.1 Instant and Grok-2 Image 1212 across benchmarks, pricing, and capabilities.

OpenAI · xAI · Updated for 2026

Which is better?

GPT-5.1 Instant and Grok-2 Image 1212 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

GPT-5.1 Instant also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose GPT-5.1 Instant

  • 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

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

GPT-5.1 Instant
OpenAI
Grok-2 Image 1212
xAI
Benchmark wins
—
—
Input price
$1.25 / M
— / M
Output price
$10.00 / M
— / M
Context window
400,000
131,072

Individual benchmarks

9 reported for GPT-5.1 Instant · 0 for Grok-2 Image 1212

No common benchmarks found

GPT-5.1 Instant and Grok-2 Image 1212don'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

GPT-5.1 Instant accepts 400,000 input tokens compared to Grok-2 Image 1212's 131,072 tokens. Only GPT-5.1 Instant specifies output context (128,000 tokens).

OpenAI
GPT-5.1 Instant
Input400,000 tokens
Output128,000 tokens
xAI
Grok-2 Image 1212
Input131,072 tokens
Output- tokens
Mon Sep 21 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-5.1 Instant supports multimodal inputs, whereas Grok-2 Image 1212 does not.

GPT-5.1 Instant can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.1 Instant

Text
Images
Audio
Video

Grok-2 Image 1212

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-5.1 Instant

Proprietary

Closed source

Grok-2 Image 1212

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.1 Instant was released on 2025-11-12, while Grok-2 Image 1212 was released on 2024-12-12.

GPT-5.1 Instant is 11 months newer than Grok-2 Image 1212.

GPT-5.1 Instant

Nov 12, 2025

10 months ago

11mo newer
Grok-2 Image 1212

Dec 12, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT-5.1 Instant is available from OpenAI. Grok-2 Image 1212 is available from xAI.

GPT-5.1 Instant

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

Grok-2 Image 1212

xai logo
xAI
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-5.1 Instant and Grok-2 Image 1212 side-by-side, then vote on the output you prefer.

GPT-5.1 Instant
✓ Preferred
Grok-2 Image 1212
Open in Playground

FAQ

Common questions about GPT-5.1 Instant vs Grok-2 Image 1212.

Which is better, GPT-5.1 Instant or Grok-2 Image 1212?

GPT-5.1 Instant (OpenAI) and Grok-2 Image 1212 (xAI) 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-5.1 Instant compare to Grok-2 Image 1212 in benchmarks?

GPT-5.1 Instant scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%.

What are the context window sizes for GPT-5.1 Instant and Grok-2 Image 1212?

GPT-5.1 Instant supports 400K tokens and Grok-2 Image 1212 supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.1 Instant and Grok-2 Image 1212?

Key differences include context window (400K vs 131K), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Instant and Grok-2 Image 1212?

GPT-5.1 Instant is developed by OpenAI and Grok-2 Image 1212 is developed by xAI.

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