Claude 3.5 Sonnet vs Grok-4.20 Beta Reasoning Comparison

Comparing Claude 3.5 Sonnet and Grok-4.20 Beta Reasoning across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude 3.5 Sonnet and Grok-4.20 Beta 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-4.20 Beta Reasoning costs less

For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 1.5x more expensive than Grok-4.20 Beta Reasoning ($2.00/1M tokens).

For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 2.5x more expensive than Grok-4.20 Beta Reasoning ($6.00/1M tokens).

In conclusion, Claude 3.5 Sonnet is more expensive than Grok-4.20 Beta 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 3.5 Sonnet

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

Grok-4.20 Beta Reasoning

Input tokens$2.00

Output tokens$6.00

Best providerxAI

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Context Window

Maximum input and output token capacity

Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Claude 3.5 Sonnet's 200,000 tokens. Claude 3.5 Sonnet can generate longer responses up to 200,000 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.

Claude 3.5 Sonnet

Input200,000 tokens

Output200,000 tokens

Grok-4.20 Beta Reasoning

Input2,000,000 tokens

Output30,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3.5 Sonnet and Grok-4.20 Beta Reasoning support multimodal inputs.

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

Claude 3.5 Sonnet

Text

Images

Audio

Video

Grok-4.20 Beta 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 3.5 Sonnet

Proprietary

Closed source

Grok-4.20 Beta Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3.5 Sonnet was released on 2024-10-22, while Grok-4.20 Beta Reasoning was released on 2026-03-09.

Grok-4.20 Beta Reasoning is 17 months newer than Claude 3.5 Sonnet.

Claude 3.5 Sonnet

Oct 22, 2024

1.4 years ago

Grok-4.20 Beta Reasoning

Mar 9, 2026

5 days ago

1.4yr 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 3.5 Sonnet is available from Anthropic, Bedrock, Google. Grok-4.20 Beta Reasoning is available from xAI. The availability of providers can affect quality of the model and reliability.