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GPT-5.5 Pro vs Grok 4.7

GPT-5.5 Pro and Grok 4.7 are closely matched at 44.8 and 48.5 on the LLM Stats Score. Grok 4.7 is 22.5x cheaper per token.

OpenAI · xAI · Updated for 2026

Which is better?

GPT-5.5 Pro and Grok 4.7 are closely matched on the overall LLM Stats Score at 44.8 and 48.5.

On price, Grok 4.7 is roughly 22.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.5 Pro also accepts a larger context window (1,050,000 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-5.5 Pro

  • you process long inputs — it offers a 1,050,000 token context window

Choose Grok 4.7

  • cost matters — it's about 22.5x cheaper per token
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

GPT-5.5 Pro
OpenAI
Grok 4.7
xAI
Core performance indexes
LLM Stats Score
44.8
#38
48.5
#23
Reasoning
44.6
#33
37.4
#69
Agents
27.6
#44
36.1
#19
Cost, coverage & limits
Benchmark wins
—
—
Input price
$30.00 / M
$2.00 / M
Output price
$180.00 / M
$6.00 / M
Context window
1,050,000
500,000

Individual benchmarks

5 reported for GPT-5.5 Pro · 23 for Grok 4.7

No common benchmarks found

GPT-5.5 Pro and Grok 4.7don'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

Pricing Analysis

Price comparison per million tokens

Grok 4.7 costs less

For input processing, GPT-5.5 Pro ($30.00/1M tokens) is 15.0x more expensive than Grok 4.7 ($2.00/1M tokens).

For output processing, GPT-5.5 Pro ($180.00/1M tokens) is 30.0x more expensive than Grok 4.7 ($6.00/1M tokens).

In conclusion, GPT-5.5 Pro is more expensive than Grok 4.7.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Tue Sep 22 2026 • llm-stats.com
OpenAI
GPT-5.5 Pro
Input tokens$30.00
Output tokens$180.00
Best providerOpenAI
xAI
Grok 4.7
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.5 Pro accepts 1,050,000 input tokens compared to Grok 4.7's 500,000 tokens. Only GPT-5.5 Pro specifies output context (128,000 tokens).

OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
xAI
Grok 4.7
Input500,000 tokens
Output- tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-5.5 Pro and Grok 4.7 support multimodal inputs.

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

GPT-5.5 Pro

Text
Images
Audio
Video

Grok 4.7

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-5.5 Pro

Proprietary

Closed source

Grok 4.7

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.5 Pro was released on 2026-04-23, while Grok 4.7 was released on 2026-09-21.

Grok 4.7 is 5 months newer than GPT-5.5 Pro.

GPT-5.5 Pro

Apr 23, 2026

5 months ago

Grok 4.7

Sep 21, 2026

0 days ago

5mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a knowledge cutoff of 2025-12-01, while Grok 4.7 has a cutoff of 2026-06-01.

Grok 4.7 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to GPT-5.5 Pro (2025-12-01).

GPT-5.5 Pro

Dec 2025

Grok 4.7

Jun 2026

6 mo newer

Provider Availability

GPT-5.5 Pro is available from OpenAI. Grok 4.7 is available from xAI.

GPT-5.5 Pro

openai logo
OpenAI
Input Price:Input: $30.00/1MOutput Price:Output: $180.00/1M

Grok 4.7

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* 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-5.5 Pro and Grok 4.7 side-by-side, then vote on the output you prefer.

GPT-5.5 Pro
✓ Preferred
Grok 4.7
Open in Playground

FAQ

Common questions about GPT-5.5 Pro vs Grok 4.7.

Which is better, GPT-5.5 Pro or Grok 4.7?

GPT-5.5 Pro and Grok 4.7 are closely matched on the LLM Stats Score at 44.8 and 48.5. GPT-5.5 Pro is made by OpenAI and Grok 4.7 is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-5.5 Pro compare to Grok 4.7 in benchmarks?

GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%. Grok 4.7 scores BixBench MCQ: 88.4%, WMDP-Bio: 88.1%, WMDP-Cyber: 88.1%, WMDP-Chem: 84.9%, CyberGym: 80.3%.

Is GPT-5.5 Pro cheaper than Grok 4.7?

Grok 4.7 is 15.0x cheaper for input tokens. GPT-5.5 Pro costs $30.00/M input and $180.00/M output via openai. Grok 4.7 costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for GPT-5.5 Pro and Grok 4.7?

GPT-5.5 Pro supports 1.1M tokens and Grok 4.7 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.5 Pro and Grok 4.7?

Key differences include LLM Stats Score (44.8 vs 48.5), context window (1.1M vs 500K), input pricing ($30.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.5 Pro and Grok 4.7?

GPT-5.5 Pro is developed by OpenAI and Grok 4.7 is developed by xAI.

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