Grok 4 Fast Reasoning
Review Grok 4 Fast Reasoning on key metrics including price, context length, throughput, and model features.
AuthorxAI
Context Length2M
Supports Tools
State-of-the-art reasoning model optimized for cost-efficient, high-quality chain-of-thought. Trained end-to-end with tool use and agentic search, it matches top-tier benchmarks like AIME, HMMT, and GPQA at 40% lower token use versus Grok 4. Features a huge 2M token context and native web/X browsing. Ideal for agentic workflows, research, code, logic, and complex multi-step tasks. Offers up to 98% cheaper reasoning versus previous models.
Activity
Last 14 daysPrompt
55KCompletion
22KTotal
77KStartup
Startup
Latency (p50)1.35s
Throughput (p50)120.6 tok/s
Pricing
Input$0.10/M tokens
Output$0.25/M tokens
Cached input$0.02/M tokens
Features
Input Modalitiestext, image
Output Modalitiestext
Supported EndpointsChat Completions
Vision
Supports Tools