Grok-4.20 Reasoning
Long-document analysis and problems that benefit from explicit reasoning.
What are Grok-4.20 Reasoning's specs and price?
Grok-4.20 Reasoning, built by xAI, ships a 1M-token context window and a 64K-token max output, released 2026-03. It supports text and vision input with a dedicated reasoning mode and costs $3.00 per million blended tokens, the 23rd-cheapest of 32 models we track.
Specs
| Context window | 1M tokens |
| Max output | 64K tokens |
| Modalities | text, vision |
| Extended thinking | Yes |
| Released | 2026-03 |
| Knowledge cutoff | 2026-01 |
| Provider | xAI |
Verified 2026-08-08 — source.
Where it ranks
Strengths
- State-of-the-art document analysis at 1M context
- Dedicated reasoning mode
- Strong vision understanding
More about Grok-4.20 Reasoning
FAQ
What is Grok-4.20 Reasoning's context window?
Grok-4.20 Reasoning has a 1M-token context window and a 64K-token max output — the 3rd-largest context of the 32 current models we track. Source: https://docs.x.ai/docs/models, verified 2026-08-08.
Does Grok-4.20 Reasoning support vision or audio input?
Yes — Grok-4.20 Reasoning accepts vision input in addition to text.
Does Grok-4.20 Reasoning have a reasoning or extended-thinking mode?
Yes — Grok-4.20 Reasoning exposes a dedicated reasoning mode for multi-step problems.
When was Grok-4.20 Reasoning released, and what is its knowledge cutoff?
Grok-4.20 Reasoning was released 2026-03 with a knowledge cutoff of 2026-01.
How much does Grok-4.20 Reasoning cost, and who provides it?
Grok-4.20 Reasoning is served by xAI at $3.00/M blended tokens (3:1 input:output) — the 23rd-cheapest of 32 current models. Full pricing breakdown: /llm-api-pricing/grok-4-20-0309-reasoning.