Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 54.9% higher average benchmark score. Grok 4 Fast offers 2.0M more tokens in context window than GPT-3.5 Turbo. Grok 4 Fast is $1.30 cheaper per million tokens. Grok 4 Fast supports multimodal inputs. Overall, Grok 4 Fast is the stronger choice for coding tasks.
OpenAI
GPT-3.5 Turbo was developed as an optimized version of GPT-3.5, designed to provide a balance of capability and efficiency for conversational and completion tasks. Built to serve as a cost-effective option for applications requiring reliable language understanding and generation, it became widely adopted for chatbots, content generation, and general-purpose AI assistance.
xAI
Grok 4 Fast is a multimodal language model developed by xAI. It achieves strong performance with an average score of 73.0% across 7 benchmarks. It excels particularly in SimpleQA (95.0%), HMMT 2025 (93.3%), AIME 2025 (92.0%). With a 2.0M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
2 years newer

GPT-3.5 Turbo
OpenAI
2023-03-21

Grok 4 Fast
xAI
2025-08-28
Cost per million tokens (USD)

GPT-3.5 Turbo

Grok 4 Fast
Context window and performance specifications
Average performance across 1 common benchmarks

GPT-3.5 Turbo

Grok 4 Fast
GPT-3.5 Turbo
2021-09-30
Available providers and their performance metrics

GPT-3.5 Turbo
Azure
OpenAI


GPT-3.5 Turbo

Grok 4 Fast

GPT-3.5 Turbo

Grok 4 Fast
Grok 4 Fast
xAI