Model Comparison

Claude Sonnet 5 vs Grok 4.5Which is better in 2026?

Both models are evenly matched across the benchmarks. Grok 4.5 is 2.0x cheaper per token.

Verdict: Claude Sonnet 5 vs Grok 4.5 — which is better?

Claude Sonnet 5 (by Anthropic) and Grok 4.5 (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.

Claude Sonnet 5 outperforms in 1 benchmarks (GDPval-AA), while Grok 4.5 is better at 1 benchmark (SWE-Bench Pro). Both models are evenly matched across the benchmarks.

On price, Grok 4.5 is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Sonnet 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Sonnet 5 if…

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

Choose Grok 4.5 if…

  • cost matters — it's about 2.0x cheaper per token
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Sonnet 5 outperforms in 1 benchmarks (GDPval-AA), while Grok 4.5 is better at 1 benchmark (SWE-Bench Pro).

Both models are evenly matched across the benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4.5 costs less

For input processing, Claude Sonnet 5 ($3.00/1M tokens) is 1.5x more expensive than Grok 4.5 ($2.00/1M tokens).

For output processing, Claude Sonnet 5 ($15.00/1M tokens) is 2.5x more expensive than Grok 4.5 ($6.00/1M tokens).

In conclusion, Claude Sonnet 5 is more expensive than Grok 4.5.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
Anthropic
Claude Sonnet 5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
xAI
Grok 4.5
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

Claude Sonnet 5 accepts 1,000,000 input tokens compared to Grok 4.5's 500,000 tokens. Only Claude Sonnet 5 specifies output context (64,000 tokens).

Anthropic
Claude Sonnet 5
Input1,000,000 tokens
Output64,000 tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 5 and Grok 4.5 support multimodal inputs.

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

Claude Sonnet 5

Text
Images
Audio
Video

Grok 4.5

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.

Claude Sonnet 5

Proprietary

Closed source

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 5 was released on 2026-06-30, while Grok 4.5 was released on 2026-07-08.

Grok 4.5 is 0 month newer than Claude Sonnet 5.

Claude Sonnet 5

Jun 30, 2026

2 weeks ago

Grok 4.5

Jul 8, 2026

1 weeks ago

1w newer

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

Claude Sonnet 5 is available from Anthropic. Grok 4.5 is available from xAI.

Claude Sonnet 5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Grok 4.5

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→

Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Higher GDPval-AA score (53.9% vs 51.4%)
xAI
Less expensive input tokens
Less expensive output tokens
Higher SWE-Bench Pro score (64.7% vs 63.2%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Sonnet 5 and Grok 4.5 side-by-side, then vote on the output you prefer.

Claude Sonnet 5
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 5
xAI
Grok 4.5

FAQ

Common questions about Claude Sonnet 5 vs Grok 4.5.

Which is better, Claude Sonnet 5 or Grok 4.5?

Both models are evenly matched across the benchmarks. Claude Sonnet 5 is made by Anthropic and Grok 4.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 5 compare to Grok 4.5 in benchmarks?

Claude Sonnet 5 scores CharXiv-R: 88.3%, ChartMuseum: 86.7%, SWE-Bench Verified: 85.2%, BrowseComp: 84.7%, GDP.pdf: 81.6%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

Is Claude Sonnet 5 cheaper than Grok 4.5?

Grok 4.5 is 1.5x cheaper for input tokens. Claude Sonnet 5 costs $3.00/M input and $15.00/M output via anthropic. Grok 4.5 costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for Claude Sonnet 5 and Grok 4.5?

Claude Sonnet 5 supports 1.0M tokens and Grok 4.5 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 Claude Sonnet 5 and Grok 4.5?

Key differences include context window (1.0M vs 500K), input pricing ($3.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5 and Grok 4.5?

Claude Sonnet 5 is developed by Anthropic and Grok 4.5 is developed by xAI.

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