Model Comparison
Claude Haiku 4.5 vs o1-previewWhich is better in 2026?
Both models are evenly matched across the benchmarks. Claude Haiku 4.5 is 13.1x cheaper per token.
Verdict: Claude Haiku 4.5 vs o1-preview — which is better?
Claude Haiku 4.5 (by Anthropic) and o1-preview (by OpenAI) 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 (SWE-Bench Verified), while o1-preview is better at 1 benchmark (GPQA). Both models are evenly matched across the benchmarks.
On price, Claude Haiku 4.5 is roughly 13.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Haiku 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude Haiku 4.5 if…
- cost matters — it's about 13.1x cheaper per token
- you process long inputs — it offers a 200,000 token context window
- you want the most recent training data — it shipped Oct 2025
Choose o1-preview if…
- you want predictable pricing at $15.00/M input and $60.00/M output
Performance Benchmarks
Comparative analysis across standard metrics
Claude Haiku 4.5 outperforms in 1 benchmarks (SWE-Bench Verified), while o1-preview is better at 1 benchmark (GPQA).
Both models are evenly matched across the 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 15.0x cheaper than o1-preview ($15.00/1M tokens).
For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 12.0x cheaper than o1-preview ($60.00/1M tokens).
In conclusion, o1-preview 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
Claude Haiku 4.5 accepts 200,000 input tokens compared to o1-preview's 128,000 tokens. Claude Haiku 4.5 can generate longer responses up to 64,000 tokens, while o1-preview is limited to 32,768 tokens.
Input Capabilities
Supported data types and modalities
Claude Haiku 4.5 supports multimodal inputs, whereas o1-preview does not.
Claude Haiku 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Haiku 4.5
o1-preview
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 o1-preview was released on 2024-09-12.
Claude Haiku 4.5 is 13 months newer than o1-preview.
Oct 15, 2025
8 months ago
1.1yr newerSep 12, 2024
1.8 years ago
Knowledge Cutoff
When training data ends
Claude Haiku 4.5 has a documented knowledge cutoff of 2025-02-01, while o1-preview'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 o1-preview's cutoff date.
Feb 2025
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Provider Availability
Claude Haiku 4.5 is available from Anthropic, Vertex AI. o1-preview is available from OpenAI, Azure.
Claude Haiku 4.5
o1-preview
Outputs Comparison
Key Takeaways
Claude Haiku 4.5
View detailsAnthropic
o1-preview
View detailsOpenAI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude Haiku 4.5 and o1-preview side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude Haiku 4.5 vs o1-preview.