Grok 4.20 (Reasoning)
by xAIChat
Reasoning Grok for document-heavy analysis and long-horizon tool use
- Context
- 1M tokens
- Max output
- 30,000 tokens
- Released
- 2026-03-09
- Weights
- Closed
xai/grok-4-20-0309-reasoning · also seen as xai.grok-4.20-reasoning, grok-4-20-reasoning, x-ai/grok-4.20, x-ai/grok-4.2-fast, +3 more
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-03-09
- Weights
- Closed
- Input
- Text, Image, PDF
- Output
- Text
- Context window
- 1,000,000 max across endpoints
- Max output
- 30,000
- Providers
- 5 + 10 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $1.25–$2.00 in · $2.50–$6.00 out per 1M tokens · across all 5 providers
More details
- Last updated
- 2026-04-08
- Knowledge cutoff
- 2025-09
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.
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Price history
No 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
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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 (Reasoning) |
|---|---|---|---|---|---|
| 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 4.20xAI | $1.46 | $1.25 | $2.50 | 1M | +0% |
| Grok 4.20 (Non-Reasoning)xAI | $1.46 | $1.25 | $2.50 | 1M | +0% |
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