Model Comparison
Claude 3.5 Sonnet vs Grok-4.1 Fast Non-ReasoningWhich is better in 2026?
Comparing Claude 3.5 Sonnet and Grok-4.1 Fast Non-Reasoning across benchmarks, pricing, and capabilities.
Verdict: Claude 3.5 Sonnet vs Grok-4.1 Fast Non-Reasoning — which is better?
Claude 3.5 Sonnet (by Anthropic) and Grok-4.1 Fast Non-Reasoning (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-4.1 Fast Non-Reasoning is roughly 21.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4.1 Fast Non-Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude 3.5 Sonnet if…
- you want predictable pricing at $3.00/M input and $15.00/M output
Choose Grok-4.1 Fast Non-Reasoning if…
- cost matters — it's about 21.8x 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 Nov 2025
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3.5 Sonnet and Grok-4.1 Fast Non-Reasoningdon'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
For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 15.0x more expensive than Grok-4.1 Fast Non-Reasoning ($0.20/1M tokens).
For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 30.0x more expensive than Grok-4.1 Fast Non-Reasoning ($0.50/1M tokens).
In conclusion, Claude 3.5 Sonnet is more expensive than Grok-4.1 Fast Non-Reasoning.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4.1 Fast Non-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-4.1 Fast Non-Reasoning is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Claude 3.5 Sonnet and Grok-4.1 Fast Non-Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude 3.5 Sonnet
Grok-4.1 Fast Non-Reasoning
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude 3.5 Sonnet was released on 2024-10-22, while Grok-4.1 Fast Non-Reasoning was released on 2025-11-17.
Grok-4.1 Fast Non-Reasoning is 13 months newer than Claude 3.5 Sonnet.
Oct 22, 2024
1.7 years ago
Nov 17, 2025
7 months ago
1.1yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3.5 Sonnet is available from Anthropic, Bedrock, Google. Grok-4.1 Fast Non-Reasoning is available from xAI.
Claude 3.5 Sonnet
Grok-4.1 Fast Non-Reasoning
Outputs Comparison
Key Takeaways
Claude 3.5 Sonnet
View detailsAnthropic
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude 3.5 Sonnet and Grok-4.1 Fast Non-Reasoning side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude 3.5 Sonnet vs Grok-4.1 Fast Non-Reasoning.