Tuesday, July 7, 2026 · No. 345Prices synced 1 hour ago
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The AI Model Price Index

Grok-4-Fast-Reasoning

by Poe · family grok · listed Sep 2025RTV

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Current rates USD per 1M tokens

Input$0.20
Output$0.50
Cache read$0.05
Cache write—

Against the market

Input price vs. maker flagships ($/1M tokens)
DeepSeek V4 FlashDeepSeek V4 Flash: $0.14 per 1M tokens$0.14Grok-4-Fast-ReasoningGrok-4-Fast-Reasoning: $0.20 per 1M tokens$0.20Qwen3.7 PlusQwen3.7 Plus: $0.50 per 1M tokens$0.50Grok 4.3Grok 4.3: $1.25 per 1M tokens$1.25Gemini 3.5 FlashGemini 3.5 Flash: $1.50 per 1M tokens$1.50Mistral Medium (latest)Mistral Medium (latest): $1.50 per 1M tokens$1.50Claude Sonnet 5Claude Sonnet 5: $2.00 per 1M tokens$2.00GPT-5.5 ProGPT-5.5 Pro: $30.00 per 1M tokens$30.00
Output price vs. maker flagships ($/1M tokens)
DeepSeek V4 FlashDeepSeek V4 Flash: $0.28 per 1M tokens$0.28Grok-4-Fast-ReasoningGrok-4-Fast-Reasoning: $0.50 per 1M tokens$0.50Grok 4.3Grok 4.3: $2.50 per 1M tokens$2.50Qwen3.7 PlusQwen3.7 Plus: $3.00 per 1M tokens$3.00Mistral Medium (latest)Mistral Medium (latest): $7.50 per 1M tokens$7.50Gemini 3.5 FlashGemini 3.5 Flash: $9.00 per 1M tokens$9.00Claude Sonnet 5Claude Sonnet 5: $10.00 per 1M tokens$10.00GPT-5.5 ProGPT-5.5 Pro: $180 per 1M tokens$180

On the record

Model id
xai/grok-4-fast-reasoning
Context window
2M tokens
Max output
128K tokens
Input modalities
text, image
Output modalities
text
Reasoning
yes
Tool calls
yes
Open weights
no
Knowledge cutoff
—
Released
2025-09-16
Last updated
2025-09-16
Provider docs
creator.poe.com/docs/external-applications/openai-compatible-api

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