Comprehensive side-by-side LLM comparison
Grok 4.1 Fast offers 1.9M more tokens in context window than GPT-4o. Grok 4.1 Fast is $6.50 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
OpenAI
GPT-4o, released by OpenAI in May 2024, is a multimodal large language model from the GPT-4 family that natively processes text, image, and audio inputs in a single end-to-end model. It features a 128K token context window and demonstrated competitive performance across coding, reasoning, and vision benchmarks at its release. GPT-4o targets general-purpose assistant applications, vision-enabled workflows, and use cases requiring low-latency multimodal understanding.
xAI
Grok 4.1 Fast, released by xAI in November 2025, is a fast-response variant from the Grok 4 family featuring a 2M token context window designed for high-throughput applications. It omits thinking tokens for immediate responses, reducing latency while maintaining strong output quality. Grok 4.1 Fast targets production APIs, real-time assistants, and cost-sensitive applications requiring long-context understanding at high volume.
1 year newer

GPT-4o
OpenAI
2024-05-13

Grok 4.1 Fast
xAI
2025-11-17
Cost per million tokens (USD)
GPT-4o
Grok 4.1 Fast
Context window and performance specifications
GPT-4o
2024-04
Available providers and their performance metrics
GPT-4o
OpenAI
Grok 4.1 Fast
GPT-4o
Grok 4.1 Fast
GPT-4o
Grok 4.1 Fast
xAI