Grok 4.20
by xAIChat
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines low hallucination rates with strict prompt adherence.
- Context
- 1M tokens
- Max output
- 1,000,000 tokens
- Parameters
- 500B (total or active not stated)
- Released
- 2026-03-31
- Weights
- Closed
xai/grok-4-20 · also seen as x-ai/grok-4.20, x-ai/grok-4.20-20260309
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-03-31
- Weights
- Closed
- Input
- Text, Image
- Output
- Text
- Context window
- 1,000,000 max across endpoints
- Max output
- 1,000,000
- Providers
- 3 + 3 gateways, not counted as providers
- Epoch Capabilities Index
- 152.1 ± 2.3 against price
- Direct price range
- $1.25–$1.42 in · $2.50–$2.83 out per 1M tokens · 2 of 3 providers have a comparable price
More details
- Last updated
- 2026-06-11
- Knowledge cutoff
- 2025-09-01
- Parameters
- 500B (total or active not stated)
- Developer country
- United States of America
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
Loading endpoints…
Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $1.25 in / $2.50 out per 1M tokens at xAI on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
Loading endpoints…
Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs Grok 4.20 |
|---|---|---|---|---|---|
| Sakana NamazuSakana AI | $1.46 | $0.95 | $4.00 | 262K | +0% |
| Grok 4.20 Multi Agent BetaSpaceXAI | $1.46 | $1.25 | $2.50 | 2M | +0% |
| Grok 4.20 Non-ReasoningSpaceXAI | $1.46 | $1.25 | $2.50 | 2M | +0% |
| Grok 4.20 Beta Non-ReasoningSpaceXAI | $1.46 | $1.25 | $2.50 | 2M | +0% |
| Grok 4.20 ReasoningSpaceXAI | $1.46 | $1.25 | $2.50 | 2M | +0% |
| Grok 4.20 Beta ReasoningSpaceXAI | $1.46 | $1.25 | $2.50 | 2M | +0% |
| Grok 4.20 (Non-Reasoning)xAI | $1.46 | $1.25 | $2.50 | 1M | +0% |
| Grok 4.20 (Reasoning)xAI | $1.46 | $1.25 | $2.50 | 1M | +0% |
More from xAI
Newest xAI models in the catalogue. All xAI models
| Model | Released | Context | Listed price |
|---|---|---|---|
| Grok Imagine Video 1.5 Lite | 2026-10-01 | 1K | unpriced |
| Grok 4.7 | 2026-09-21 | 500K | from $1.60 |
| Grok 4.6 | 2026-08-12 | 500K | from $2.00 |
| Grok Imagine Image 2.0 | 2026-08-07 | 65.5K | unpriced |
| Grok Voice STT 1.0 | 2026-08-04 | 15K | unpriced |
| Grok STT 1.0 | 2026-07-23 | — | unpriced |
| Grok 4.5 | 2026-07-08 | 500K | from $2.00 |
| Grok Imagine Video 1.5 | 2026-05-30 | 1K | unpriced |