Model Comparison

GPT-5.6 Sol vs Grok 4.3Which is better in 2026?

GPT-5.6 Sol significantly outperforms across most benchmarks. Grok 4.3 is 7.2x cheaper per token.

Verdict: GPT-5.6 Sol vs Grok 4.3 — which is better?

GPT-5.6 Sol (by OpenAI) and Grok 4.3 (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-5.6 Sol outperforms in 1 benchmarks (GDPval-AA), while Grok 4.3 is better at 0 benchmarks. GPT-5.6 Sol significantly outperforms across most benchmarks.

On price, Grok 4.3 is roughly 7.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.6 Sol also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-5.6 Sol if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you process long inputs — it offers a 1,050,000 token context window
  • you want the most recent training data — it shipped Jul 2026

Choose Grok 4.3 if…

  • cost matters — it's about 7.2x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.6 Sol outperforms in 1 benchmarks (GDPval-AA), while Grok 4.3 is better at 0 benchmarks.

GPT-5.6 Sol significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4.3 costs less

For input processing, GPT-5.6 Sol ($5.00/1M tokens) is 4.0x more expensive than Grok 4.3 ($1.25/1M tokens).

For output processing, GPT-5.6 Sol ($30.00/1M tokens) is 12.0x more expensive than Grok 4.3 ($2.50/1M tokens).

In conclusion, GPT-5.6 Sol is more expensive than Grok 4.3.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
OpenAI
GPT-5.6 Sol
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
xAI
Grok 4.3
Input tokens$1.25
Output tokens$2.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.6 Sol accepts 1,050,000 input tokens compared to Grok 4.3's 1,000,000 tokens. Only GPT-5.6 Sol specifies output context (128,000 tokens).

OpenAI
GPT-5.6 Sol
Input1,050,000 tokens
Output128,000 tokens
xAI
Grok 4.3
Input1,000,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.6 Sol supports multimodal inputs, whereas Grok 4.3 does not.

GPT-5.6 Sol can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.6 Sol

Text
Images
Audio
Video

Grok 4.3

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-5.6 Sol

Proprietary

Closed source

Grok 4.3

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.6 Sol was released on 2026-07-09, while Grok 4.3 was released on 2026-05-06.

GPT-5.6 Sol is 2 months newer than Grok 4.3.

GPT-5.6 Sol

Jul 9, 2026

1 weeks ago

2mo newer
Grok 4.3

May 6, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.6 Sol has a documented knowledge cutoff of 2026-02-16, while Grok 4.3's cutoff date is not specified.

We can confirm GPT-5.6 Sol's training data extends to 2026-02-16, but cannot make a direct comparison without Grok 4.3's cutoff date.

GPT-5.6 Sol

Feb 2026

Grok 4.3

—

Provider Availability

GPT-5.6 Sol is available from OpenAI. Grok 4.3 is available from xAI.

GPT-5.6 Sol

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M

Grok 4.3

xai logo
xAI
Input Price:Input: $1.25/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (1,050,000 tokens)
Supports multimodal inputs
Higher GDPval-AA score (58.3% vs 36.7%)
xAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.6 Sol and Grok 4.3 side-by-side, then vote on the output you prefer.

GPT-5.6 Sol
✓ Preferred
Grok 4.3
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.6 Sol
xAI
Grok 4.3

FAQ

Common questions about GPT-5.6 Sol vs Grok 4.3.

Which is better, GPT-5.6 Sol or Grok 4.3?

GPT-5.6 Sol significantly outperforms across most benchmarks. GPT-5.6 Sol is made by OpenAI and Grok 4.3 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.6 Sol compare to Grok 4.3 in benchmarks?

GPT-5.6 Sol scores Connectors: 100.0%, Capture-the-Flag Challenges (Internal): 96.7%, HealthBench Consensus: 95.5%, GPQA: 94.6%, MRCR v2 (8-needle): 91.5%. Grok 4.3 scores Finance Agent v2: 37.7%, GDPval-AA: 36.7%.

Is GPT-5.6 Sol cheaper than Grok 4.3?

Grok 4.3 is 4.0x cheaper for input tokens. GPT-5.6 Sol costs $5.00/M input and $30.00/M output via openai. Grok 4.3 costs $1.25/M input and $2.50/M output via xai.

What are the context window sizes for GPT-5.6 Sol and Grok 4.3?

GPT-5.6 Sol supports 1.1M tokens and Grok 4.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.6 Sol and Grok 4.3?

Key differences include context window (1.1M vs 1.0M), input pricing ($5.00 vs $1.25/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.6 Sol and Grok 4.3?

GPT-5.6 Sol is developed by OpenAI and Grok 4.3 is developed by xAI.

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