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Grok 4.6 vs Grok 4 Fast

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Grok 4.6
xai/grok-4.6
Grok 4 Fast
xai/grok-4-fast
Provider
xAI
xAI
Family
Grok 4
Grok 4
Modality
text
text
Context window
500,000 tok
256,000 tok
Max output
32,768 tok
16,384 tok
Released
2026-08-12
2025-09-19
License
Proprietary
Proprietary
Input price
$1.00 /1M
$0.500 /1M
Output price
$1.00 /1M
$2.00 /1M
Tools
yes
Streaming
yes
yes
Vision
yes
JSON mode
yes
Reasoning
Prompt caching
Batch API
Try it
Open in playground →
Open in playground →
Grok 4.6
xai/grok-4.6
Full spec →

xAI's Grok 4.6, a flagship reasoning model for coding, agentic tasks, and visual work. Accepts text and image inputs, and supports function calling and structured outputs.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows
Grok 4 Fast
xai/grok-4-fast
Full spec →

xAI Grok 4 Fast — low-latency variant.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

Grok 4.6 vs Claude Opus 5
xai/grok-4.6 · anthropic/claude-opus-5
Grok 4.6 vs Qwen3.8 Max
xai/grok-4.6 · alibaba/qwen3.8-max
Grok 4.6 vs DeepSeek V4 Pro
xai/grok-4.6 · deepseek/deepseek-v4-pro
Grok 4.6 vs Kimi K3
xai/grok-4.6 · moonshot/kimi-k3
Grok 4.6 vs GPT-5.6 Sol
xai/grok-4.6 · openai/gpt-5.6-sol
Grok 4.6 vs Claude Fable 5
xai/grok-4.6 · anthropic/claude-fable-5
Grok 4.6 vs Gemini 3.6 Flash
xai/grok-4.6 · google/gemini-3.6-flash
Grok 4.6 vs GLM-5.2
xai/grok-4.6 · zai-org/glm-5.2
Grok 4.6 vs Gemini 3.1 Pro
xai/grok-4.6 · google/gemini-3.1-pro
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# Grok 4.6
client.chat.completions.create(
    model="xai/grok-4.6",
    messages=[{"role":"user","content":"hello"}],
)

# Grok 4 Fast
client.chat.completions.create(
    model="xai/grok-4-fast",
    messages=[{"role":"user","content":"hello"}],
)
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