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Grok 4.20 Reasoning (Vertex AI (OpenAI-compatible))

O-series reasoning model for hard analysis, math, coding, and planning

Model facts

Context window
2M tokens
Maximum output
3K tokens
Cheapest paid input
$1.25 per 1M tokens
Cheapest paid output
$2.5 per 1M tokens
Open weights
no
Providers
1

Capabilities and modalities

reasoning, tool calling, attachments, temperature control, text, image.

Observed price history

  • 2026-08-24: $1.25 input / $2.5 output per 1M tokens

API providers

  • LLM Gateway — model id vertex-openai/grok-4-20-reasoning; $1.25 input / $2.5 output per 1M tokens; provider documentation