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