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Grok-1.5 vs Grok 4.6

Comparing Grok-1.5 and Grok 4.6 across benchmarks, pricing, and capabilities.

xAI · xAI · Updated for 2026

Which is better?

Grok-1.5 and Grok 4.6 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Grok-1.5

  • you are already invested in the xAI ecosystem

Choose Grok 4.6

  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

Grok-1.5
xAI
Grok 4.6
xAI
Benchmark wins
—
—
Input price
— / M
$2.00 / M
Output price
— / M
$6.00 / M
Context window
—
500,000
Released
Mar 2024
Aug 2026
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-1.5 and Grok 4.6don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Context Window

Maximum input and output token capacity

Only Grok 4.6 specifies input context (500,000 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
xAI
Grok 4.6
Input500,000 tokens
Output- tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4.6 supports multimodal inputs, whereas Grok-1.5 does not.

Grok 4.6 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-1.5

Text
Images
Audio
Video

Grok 4.6

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.

Grok-1.5

Proprietary

Closed source

Grok 4.6

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Grok 4.6 was released on 2026-08-12.

Grok 4.6 is 29 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.4 years ago

Grok 4.6

Aug 12, 2026

1 weeks ago

2.4yr newer

Knowledge Cutoff

When training data ends

Grok 4.6 has a documented knowledge cutoff of 2026-02-01, while Grok-1.5's cutoff date is not specified.

We can confirm Grok 4.6's training data extends to 2026-02-01, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Grok 4.6

Feb 2026

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-1.5 and Grok 4.6 side-by-side, then vote on the output you prefer.

Grok-1.5
✓ Preferred
Grok 4.6
Open in Playground

FAQ

Common questions about Grok-1.5 vs Grok 4.6.

Which is better, Grok-1.5 or Grok 4.6?

Grok-1.5 (xAI) and Grok 4.6 (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 Grok-1.5 compare to Grok 4.6 in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Grok 4.6 scores CursorBench v3.2: 69.9%, DeepSWE 1.1: 65.9%, FrontierCode: 61.3%, AA-Index: 61.0%, GDPval-AA: 58.4%.

What are the context window sizes for Grok-1.5 and Grok 4.6?

Grok-1.5 supports an unknown number of tokens and Grok 4.6 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 Grok-1.5 and Grok 4.6?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

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