Grok 4.20 Reasoning
xAIUpdated July 2026. Grok 4.20 Reasoning by xAI: $1.25/M cache-miss input, $2.50/M output tokens. Cached input: $0.2/M. Long-context pricing above 200K input tokens: $2.50/M input, $5.00/M output. 1.0M context. Vision & Function Calling. Free calculator + compare 40+ models.
Input Price
$1.25
cache miss / 1M tokens
Cached Input
$0.2
per 1M tokens
Output Price
$2.50
per 1M tokens
Context Window
1.0M
tokens
Specifications
| Provider | xAI |
| Model ID | grok-4.20-0309-reasoning |
| Input Price | $1.25 / 1M cache-miss tokens |
| Cached Input Price | $0.2 / 1M tokens |
| Output Price | $2.5 / 1M tokens |
| Long Context Threshold | 200K input tokens |
| Long Context Pricing | $2.5 / 1M cache-miss input, $0.4 / 1M cached input, $5 / 1M output |
| Context Window | 1.0M tokens |
| Max Output | Not published by provider |
| Capabilities | textvisionfunction_callingstructured_output |
| Release Date | 2026-03-10 |
| Pricing Source | Official xAI pricing |
| Price Verified | 2026-07-14 · Grok 4.5, Grok 4.3, Grok 4.20, and Grok Build pricing was refreshed from the xAI pricing table. |
| Notes | Pinned Grok 4.20 reasoning endpoint. xAI does not publish a separate maximum-output limit; requests above 200K tokens use long-context pricing. |
Monthly Cost Estimates
Estimated monthly costs based on different daily usage levels (assuming 50% input / 50% output split). Input estimates use cache-miss pricing, so cache-heavy workloads can be lower.
| Daily Tokens | Monthly Cost | Annual Cost |
|---|---|---|
| 10K | $0.56 | $6.75 |
| 50K | $2.81 | $33.75 |
| 100K | $5.63 | $67.50 |
| 500K | $28.13 | $337.50 |
| 1.0M | $56.25 | $675.00 |
About Grok 4.20 Reasoning
Grok 4.20 Reasoning is a large language model by xAI. It features a 1.0M token context window; the provider does not publish a separate maximum-output limit. The model supports 4 capabilities: text, vision, function_calling, structured_output.
At $1.25 per million cache-miss input tokens and $2.5 per million output tokens, Grok 4.20 Reasoning is positioned as a mid-range option in the xAI lineup. Repeated prefix input can be charged at $0.2 per million cached tokens. Use our Token Counter to estimate how many tokens your prompts use, and our Pricing Calculator to compare costs across all models.
Grok 4.20 Reasoning Key Details
- Pricing: $1.25/M cache-miss input tokens, $0.2/M cached input tokens, $2.5/M output tokens
- Context window: 1.0M tokens — one of the largest available
- Max output: not separately published by the provider
- Capabilities: text, vision, function_calling, structured_output
- Highlights: Pinned Grok 4.20 reasoning endpoint. xAI does not publish a separate maximum-output limit; requests above 200K tokens use long-context pricing.
- Released: 2026-03-10
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FAQ
How much does Grok 4.20 Reasoning cost?
Grok 4.20 Reasoning costs $1.25 per million cache-miss input tokens and $2.5 per million output tokens. Cached input costs $0.2 per million tokens. For a typical workload of 100K input tokens/day and 50K output tokens/day, expect approximately $7.50/month before cache-hit savings.
What is Grok 4.20 Reasoning's context window?
Grok 4.20 Reasoning supports a context window of 1.0M tokens. This means your combined input prompt and output response can be up to 1.0M tokens. xAI does not publish a separate maximum-output limit for this model.
Is Grok 4.20 Reasoning good for my use case?
Grok 4.20 Reasoning supports text, vision, function_calling, structured_output. As a mid-range model, it balances capability and cost for most production use cases. Use our Pricing Calculator to compare with alternatives.