Model Comparison

Claude Opus 4.5 vs Grok-4.20 Multi-Agent BetaWhich is better in 2026?

Comparing Claude Opus 4.5 and Grok-4.20 Multi-Agent Beta across benchmarks, pricing, and capabilities.

Verdict: Claude Opus 4.5 vs Grok-4.20 Multi-Agent Beta — which is better?

Claude Opus 4.5 (by Anthropic) and Grok-4.20 Multi-Agent Beta (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.

On price, Grok-4.20 Multi-Agent Beta is roughly 3.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok-4.20 Multi-Agent Beta also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.5 if…

  • you want predictable pricing at $5.00/M input and $25.00/M output

Choose Grok-4.20 Multi-Agent Beta if…

  • cost matters — it's about 3.3x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window
  • you want the most recent training data — it shipped Mar 2026
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Opus 4.5 and Grok-4.20 Multi-Agent Betadon'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 Multi-Agent Beta costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 2.5x more expensive than Grok-4.20 Multi-Agent Beta ($2.00/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 4.2x more expensive than Grok-4.20 Multi-Agent Beta ($6.00/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than Grok-4.20 Multi-Agent Beta.*

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

Lowest available price from all providers
Fri Jun 19 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
xAI
Grok-4.20 Multi-Agent Beta
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

Grok-4.20 Multi-Agent Beta 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-4.20 Multi-Agent Beta is limited to 30,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
xAI
Grok-4.20 Multi-Agent Beta
Input2,000,000 tokens
Output30,000 tokens
Fri Jun 19 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Grok-4.20 Multi-Agent Beta 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-4.20 Multi-Agent Beta

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-4.20 Multi-Agent Beta

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Grok-4.20 Multi-Agent Beta was released on 2026-03-09.

Grok-4.20 Multi-Agent Beta is 4 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

6 months ago

Grok-4.20 Multi-Agent Beta

Mar 9, 2026

3 months ago

3mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Grok-4.20 Multi-Agent Beta'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-4.20 Multi-Agent Beta's cutoff date.

Claude Opus 4.5

Mar 2025

Grok-4.20 Multi-Agent Beta

—

Provider Availability

Claude Opus 4.5 is available from Anthropic. Grok-4.20 Multi-Agent Beta is available from xAI.

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Grok-4.20 Multi-Agent Beta

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

No standout differentiators in the data we have for this pair.

xAI
Larger context window (2,000,000 tokens)
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
xAI
Grok-4.20 Multi-Agent Beta

FAQ

Common questions about Claude Opus 4.5 vs Grok-4.20 Multi-Agent Beta.

Which is better, Claude Opus 4.5 or Grok-4.20 Multi-Agent Beta?

Claude Opus 4.5 (Anthropic) and Grok-4.20 Multi-Agent Beta (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 Claude Opus 4.5 compare to Grok-4.20 Multi-Agent Beta in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%.

Is Claude Opus 4.5 cheaper than Grok-4.20 Multi-Agent Beta?

Grok-4.20 Multi-Agent Beta is 2.5x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. Grok-4.20 Multi-Agent Beta costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for Claude Opus 4.5 and Grok-4.20 Multi-Agent Beta?

Claude Opus 4.5 supports 200K tokens and Grok-4.20 Multi-Agent Beta supports 2.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4.5 and Grok-4.20 Multi-Agent Beta?

Key differences include context window (200K vs 2.0M), input pricing ($5.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and Grok-4.20 Multi-Agent Beta?

Claude Opus 4.5 is developed by Anthropic and Grok-4.20 Multi-Agent Beta is developed by xAI.

Related comparisons