Claude Opus 4.5 vs Grok-4 Fast Non-Reasoning Comparison

Comparing Claude Opus 4.5 and Grok-4 Fast Non-Reasoning across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Opus 4.5 and Grok-4 Fast Non-Reasoning don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-4 Fast Non-Reasoning costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 25.0x more expensive than Grok-4 Fast Non-Reasoning ($0.20/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 50.0x more expensive than Grok-4 Fast Non-Reasoning ($0.50/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than Grok-4 Fast Non-Reasoning.*

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

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

Claude Opus 4.5

Input tokens$5.00

Output tokens$25.00

Best providerAnthropic

Grok-4 Fast Non-Reasoning

Input tokens$0.20

Output tokens$0.50

Best providerxAI

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Context Window

Maximum input and output token capacity

Grok-4 Fast Non-Reasoning accepts 2,000,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. Claude Opus 4.5 can generate longer responses up to 64,000 tokens, while Grok-4 Fast Non-Reasoning is limited to 30,000 tokens.

Claude Opus 4.5

Input200,000 tokens

Output64,000 tokens

Grok-4 Fast Non-Reasoning

Input2,000,000 tokens

Output30,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Grok-4 Fast Non-Reasoning support multimodal inputs.

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

Claude Opus 4.5

Text

Images

Audio

Video

Grok-4 Fast Non-Reasoning

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 Opus 4.5

Proprietary

Closed source

Grok-4 Fast Non-Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Grok-4 Fast Non-Reasoning was released on 2025-08-28.

Claude Opus 4.5 is 3 months newer than Grok-4 Fast Non-Reasoning.

Claude Opus 4.5

Nov 24, 2025

3 months ago

2mo newer

Grok-4 Fast Non-Reasoning

Aug 28, 2025

6 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Grok-4 Fast Non-Reasoning's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Grok-4 Fast Non-Reasoning's cutoff date.

Claude Opus 4.5

Mar 2025

Grok-4 Fast Non-Reasoning

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Provider Availability

Claude Opus 4.5 is available from Anthropic. Grok-4 Fast Non-Reasoning is available from xAI. The availability of providers can affect quality of the model and reliability.