Model Comparison
Claude Haiku 4.5 vs Grok-4.20 Beta ReasoningWhich is better in 2026?
Claude Haiku 4.5 significantly outperforms across most benchmarks. Claude Haiku 4.5 is 1.5x cheaper per token.
Verdict: Claude Haiku 4.5 vs Grok-4.20 Beta Reasoning — which is better?
Claude Haiku 4.5 (by Anthropic) and Grok-4.20 Beta 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.
Claude Haiku 4.5 outperforms in 1 benchmarks (Finance Agent v2), while Grok-4.20 Beta Reasoning is better at 0 benchmarks. Claude Haiku 4.5 significantly outperforms across most benchmarks.
On price, Claude Haiku 4.5 is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4.20 Beta 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 Haiku 4.5 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 1.5x cheaper per token
Choose Grok-4.20 Beta Reasoning if…
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Mar 2026
Performance Benchmarks
Comparative analysis across standard metrics
Claude Haiku 4.5 outperforms in 1 benchmarks (Finance Agent v2), while Grok-4.20 Beta Reasoning is better at 0 benchmarks.
Claude Haiku 4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 2.0x cheaper than Grok-4.20 Beta Reasoning ($2.00/1M tokens).
For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 1.2x cheaper than Grok-4.20 Beta Reasoning ($6.00/1M tokens).
In conclusion, Grok-4.20 Beta Reasoning is more expensive than Claude Haiku 4.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Claude Haiku 4.5's 200,000 tokens. Claude Haiku 4.5 can generate longer responses up to 64,000 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Claude Haiku 4.5 and Grok-4.20 Beta Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 4.5
Grok-4.20 Beta 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 Haiku 4.5 was released on 2025-10-15, while Grok-4.20 Beta Reasoning was released on 2026-03-09.
Grok-4.20 Beta Reasoning is 5 months newer than Claude Haiku 4.5.
Oct 15, 2025
9 months ago
Mar 9, 2026
4 months ago
4mo newerKnowledge Cutoff
When training data ends
Claude Haiku 4.5 has a documented knowledge cutoff of 2025-02-01, while Grok-4.20 Beta Reasoning's cutoff date is not specified.
We can confirm Claude Haiku 4.5's training data extends to 2025-02-01, but cannot make a direct comparison without Grok-4.20 Beta Reasoning's cutoff date.
Feb 2025
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Provider Availability
Claude Haiku 4.5 is available from Anthropic, Vertex AI. Grok-4.20 Beta Reasoning is available from xAI.
Claude Haiku 4.5
Grok-4.20 Beta Reasoning
Outputs Comparison
Key Takeaways
Claude Haiku 4.5
View detailsAnthropic
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude Haiku 4.5 and Grok-4.20 Beta Reasoning side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude Haiku 4.5 vs Grok-4.20 Beta Reasoning.