Model Comparison

Claude Opus 4 vs Grok Code Fast 1

Claude Opus 4 significantly outperforms across most benchmarks. Grok Code Fast 1 is 57.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4 outperforms in 1 benchmarks (SWE-Bench Verified), while Grok Code Fast 1 is better at 0 benchmarks.

Claude Opus 4 significantly outperforms across most benchmarks.

Sun May 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok Code Fast 1 costs less

For input processing, Claude Opus 4 ($15.00/1M tokens) is 75.0x more expensive than Grok Code Fast 1 ($0.20/1M tokens).

For output processing, Claude Opus 4 ($75.00/1M tokens) is 50.0x more expensive than Grok Code Fast 1 ($1.50/1M tokens).

In conclusion, Claude Opus 4 is more expensive than Grok Code Fast 1.*

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

Lowest available price from all providers
Sun May 24 2026 • llm-stats.com
Anthropic
Claude Opus 4
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
xAI
Grok Code Fast 1
Input tokens$0.20
Output tokens$1.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok Code Fast 1 accepts 256,000 input tokens compared to Claude Opus 4's 200,000 tokens. Claude Opus 4 can generate longer responses up to 32,000 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.

Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
xAI
Grok Code Fast 1
Input256,000 tokens
Output10,000 tokens
Sun May 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 4 supports multimodal inputs, whereas Grok Code Fast 1 does not.

Claude Opus 4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4

Text
Images
Audio
Video

Grok Code Fast 1

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

Proprietary

Closed source

Grok Code Fast 1

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4 was released on 2025-05-22, while Grok Code Fast 1 was released on 2025-08-28.

Grok Code Fast 1 is 3 months newer than Claude Opus 4.

Claude Opus 4

May 22, 2025

1.0 years ago

Grok Code Fast 1

Aug 28, 2025

8 months ago

3mo 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 Opus 4 is available from Anthropic, Bedrock, Google. Grok Code Fast 1 is available from xAI.

Claude Opus 4

anthropic logo
Anthropic
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
google logo
Google
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M

Grok Code Fast 1

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $1.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Supports multimodal inputs
Higher SWE-Bench Verified score (72.5% vs 70.8%)
xAI
Larger context window (256,000 tokens)
Less expensive input tokens
Less expensive output tokens
AnthropicClaude Opus 4
xAIGrok Code Fast 1
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4
xAI
Grok Code Fast 1

FAQ

Common questions about Claude Opus 4 vs Grok Code Fast 1.

Which is better, Claude Opus 4 or Grok Code Fast 1?

Claude Opus 4 significantly outperforms across most benchmarks. Claude Opus 4 is made by Anthropic and Grok Code Fast 1 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4 compare to Grok Code Fast 1 in benchmarks?

Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%. Grok Code Fast 1 scores SWE-Bench Verified: 70.8%.

Is Claude Opus 4 cheaper than Grok Code Fast 1?

Grok Code Fast 1 is 75.0x cheaper for input tokens. Claude Opus 4 costs $15.00/M input and $75.00/M output via anthropic. Grok Code Fast 1 costs $0.20/M input and $1.50/M output via xai.

What are the context window sizes for Claude Opus 4 and Grok Code Fast 1?

Claude Opus 4 supports 200K tokens and Grok Code Fast 1 supports 256K 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 and Grok Code Fast 1?

Key differences include context window (200K vs 256K), input pricing ($15.00 vs $0.20/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4 and Grok Code Fast 1?

Claude Opus 4 is developed by Anthropic and Grok Code Fast 1 is developed by xAI.