Model Comparison
Grok 4.5 vs o1Which is better in 2026?
Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is 8.8x cheaper per token.
Verdict: Grok 4.5 vs o1 — which is better?
Grok 4.5 (by xAI) and o1 (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.
Grok 4.5 outperforms in 1 benchmarks (GPQA), while o1 is better at 0 benchmarks. Grok 4.5 significantly outperforms across most benchmarks.
On price, Grok 4.5 is roughly 8.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4.5 also accepts a larger context window (500,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Grok 4.5 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 8.8x cheaper per token
- you process long inputs — it offers a 500,000 token context window
- you want the most recent training data — it shipped Jul 2026
Choose o1 if…
- you want predictable pricing at $15.00/M input and $60.00/M output
Performance Benchmarks
Comparative analysis across standard metrics
Grok 4.5 outperforms in 1 benchmarks (GPQA), while o1 is better at 0 benchmarks.
Grok 4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4.5 ($2.00/1M tokens) is 7.5x cheaper than o1 ($15.00/1M tokens).
For output processing, Grok 4.5 ($6.00/1M tokens) is 10.0x cheaper than o1 ($60.00/1M tokens).
In conclusion, o1 is more expensive than Grok 4.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4.5 accepts 500,000 input tokens compared to o1's 200,000 tokens. Only o1 specifies output context (100,000 tokens).
Input Capabilities
Supported data types and modalities
Grok 4.5 supports multimodal inputs, whereas o1 does not.
Grok 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok 4.5
o1
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
Grok 4.5 was released on 2026-07-16, while o1 was released on 2024-12-17.
Grok 4.5 is 19 months newer than o1.
Jul 16, 2026
2 days ago
1.6yr newerDec 17, 2024
1.6 years ago
Knowledge Cutoff
When training data ends
Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while o1's cutoff date is not specified.
We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without o1's cutoff date.
Feb 2026
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Provider Availability
Grok 4.5 is available from xAI. o1 is available from Azure, OpenAI.
Grok 4.5
o1
Outputs Comparison
Key Takeaways
o1
View detailsOpenAI
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Grok 4.5 and o1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok 4.5 vs o1.