LLM Comparison

Grok 4.1 Fast vs GPT-5.4

Side-by-side specs, pricing & capabilities · Updated April 2026

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2/6 models
Same tier:
 xAIGrok 4.1 FastOpenAIGPT-5.4
OrganizationxAIxAIOpenAIOpenAI
OpenTools Score
FamilyGrokGPT
StatusCurrentCurrent
Release DateNov 2025Mar 2026
Context Window2.0M tokens1.1M tokens
Input Price$0.20/M tokens$2.50/M tokens
Output Price$0.50/M tokens$15.00/M tokens
Pricing NotesCache read: $0.0500/M tokensCache read: $0.2500/M tokens
Capabilities
textvisioncode
textvisioncode
Max Output30K tokens128K tokens
API Identifierx-ai/grok-4.1-fastopenai/gpt-5.4
 View Grok 4.1 FastView GPT-5.4

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
Grok 4.1 FastCheapest$0.20$0.25$0.45—
GPT-5.4$2.50$7.50$10.00+2122%

xAI

Grok 4.1 Fast

Grok 4.1 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.

OpenAI

GPT-5.4

GPT-5.4 is a multimodal llm from OpenAI. Supports up to 1,050,000 token context window. Available from $2.50/M input tokens.

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