Model Comparison
GPT-4 Turbo vs Grok 4.5Which is better in 2026?
Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is 5.0x cheaper per token.
Verdict: GPT-4 Turbo vs Grok 4.5 — which is better?
GPT-4 Turbo (by OpenAI) and Grok 4.5 (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.
GPT-4 Turbo outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA). Grok 4.5 significantly outperforms across most benchmarks.
On price, Grok 4.5 is roughly 5.0x 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 GPT-4 Turbo if…
- you want predictable pricing at $10.00/M input and $30.00/M output
Choose Grok 4.5 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 5.0x 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
Performance Benchmarks
Comparative analysis across standard metrics
GPT-4 Turbo outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA).
Grok 4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-4 Turbo ($10.00/1M tokens) is 5.0x more expensive than Grok 4.5 ($2.00/1M tokens).
For output processing, GPT-4 Turbo ($30.00/1M tokens) is 5.0x more expensive than Grok 4.5 ($6.00/1M tokens).
In conclusion, GPT-4 Turbo 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 GPT-4 Turbo's 128,000 tokens. Only GPT-4 Turbo specifies output context (4,096 tokens).
Input Capabilities
Supported data types and modalities
Grok 4.5 supports multimodal inputs, whereas GPT-4 Turbo does not.
Grok 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-4 Turbo
Grok 4.5
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
GPT-4 Turbo was released on 2024-04-09, while Grok 4.5 was released on 2026-07-16.
Grok 4.5 is 28 months newer than GPT-4 Turbo.
Apr 9, 2024
2.3 years ago
Jul 16, 2026
2 days ago
2.3yr newerKnowledge Cutoff
When training data ends
GPT-4 Turbo has a knowledge cutoff of 2023-12-31, while Grok 4.5 has a cutoff of 2026-02-01.
Grok 4.5 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to GPT-4 Turbo (2023-12-31).
Dec 2023
Feb 2026
2.2 yr newerProvider Availability
GPT-4 Turbo is available from Azure, OpenAI. Grok 4.5 is available from xAI.
GPT-4 Turbo
Grok 4.5
Outputs Comparison
Key Takeaways
GPT-4 Turbo
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 GPT-4 Turbo and Grok 4.5 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-4 Turbo vs Grok 4.5.