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GPT-6 Sol vs Grok-1.5

GPT-6 Sol leads the LLM Stats Score 49.4 to -2.6.

OpenAI · xAI · Updated for 2026

Which is better?

GPT-6 Sol leads the overall LLM Stats Score 49.4 to -2.6, ranking #21 overall.

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

Choose GPT-6 Sol

  • overall performance matters — it scores 49.4 and ranks #21 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Grok-1.5

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

GPT-6 Sol
OpenAI
Grok-1.5
xAI
Core performance indexes
LLM Stats Score
49.4
#21
-2.6
#346
Reasoning
45.6
#29
-2.2
#336
Coding
35.8
#25
-0.9
#252
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-6 Sol · 9 for Grok-1.5

No common benchmarks found

GPT-6 Sol and Grok-1.5don'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

Only GPT-6 Sol specifies input context (1,050,000 tokens). Only GPT-6 Sol specifies output context (128,000 tokens).

OpenAI
GPT-6 Sol
Input1,050,000 tokens
Output128,000 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-6 Sol supports multimodal inputs, whereas Grok-1.5 does not.

GPT-6 Sol can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-6 Sol

Text
Images
Audio
Video

Grok-1.5

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-6 Sol

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Sol was released on 2026-09-22, while Grok-1.5 was released on 2024-03-28.

GPT-6 Sol is 30 months newer than Grok-1.5.

GPT-6 Sol

Sep 22, 2026

0 days ago

2.5yr newer
Grok-1.5

Mar 28, 2024

2.5 years ago

Knowledge Cutoff

When training data ends

GPT-6 Sol has a documented knowledge cutoff of 2026-04-20, while Grok-1.5's cutoff date is not specified.

We can confirm GPT-6 Sol's training data extends to 2026-04-20, but cannot make a direct comparison without Grok-1.5's cutoff date.

GPT-6 Sol

Apr 2026

Grok-1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Sol and Grok-1.5 side-by-side, then vote on the output you prefer.

GPT-6 Sol
✓ Preferred
Grok-1.5
Open in Playground

FAQ

Common questions about GPT-6 Sol vs Grok-1.5.

Which is better, GPT-6 Sol or Grok-1.5?

GPT-6 Sol leads the LLM Stats Score 49.4 to -2.6. GPT-6 Sol is made by OpenAI and Grok-1.5 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-6 Sol compare to Grok-1.5 in benchmarks?

GPT-6 Sol scores DeepSWE 1.1: 68.8%, OSWorld 2.0: 64.4%, Agents' Last Exam: 56.4%, FrontierCode 1.1: 49.3%, AutomationBench v1.0.6: 33.2%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for GPT-6 Sol and Grok-1.5?

GPT-6 Sol supports 1.1M tokens and Grok-1.5 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-6 Sol and Grok-1.5?

Key differences include LLM Stats Score (49.4 vs -2.6), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Sol and Grok-1.5?

GPT-6 Sol is developed by OpenAI and Grok-1.5 is developed by xAI.

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