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grok-4.20-reasoning-beta pricing and usage · CheaperInference

Model record / spacexai

grok-4.20-reasoning-beta

Access grok-4.20-reasoning-beta from spacexai through one OpenAI-compatible API with live market-linked pricing and usage-based billing.

Text generationVision inputReasoningStreaming35% below list

Input / 1M tokens~~$1.25 list~~$0.8125

Output / 1M tokens~~$2.50 list~~$1.625

Cached input / 1M tokens$0.26

Current discount35%

Requests above -1 input tokens use $0.8125 input and $1.625 output per 1M tokens.

Observed reliability

100

Successful provider-reaching requests

Output speed

120.6

Median tokens per second over sustained generations

TTFT

2.2 s

p50 · p90 2.4 s · n 3

Latency

6.6 s

p50 · p90 17.4 s · n 8

Evidence strength

—

Provider: spacexai
Model ID: grok-4.20-reasoning-beta
Type: Text generation
Endpoints: /v1/chat/completions, /v1/responses, /v1/messages
Input: Not reported
Output: Not reported
Vision input: Supported
Image editing: Not supported
Video input: Not supported
Reasoning: Supported
Streaming: Supported
Context window: 2,000,000 tokens

This model takes the fields in its sample request. It has no other stated parameters.

Pricing history

See how much this model saves and when its recorded price has been lowest.

Time zone

grok-4.20-reasoning-beta

Early data

Savings are visible now, but a best-time recommendation needs at least 12 observations across 6 different hours.

Last 7 days

Average saved

31.7%

Last 7 days

Cheapest time

Collecting data

Too early

Hourly coverage

6/24

6 total observations

Signal quality

Early

More history needed

Typical unit savings$0.79 / 1M input tokens$1.58 / 1M output tokens

Hover a bar for savings per token and observation counts.

Source buckets are UTC; labels are converted to UTC.

Last 24 hours

#146

of 425 ranked models

Last 7 days

#278

of 440 ranked models

Last 30 days

#295

of 440 ranked models

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POST /v1/chat/completions

curl https://api.cheaperinference.com/v1/chat/completions \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "grok-4.20-reasoning-beta",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ]  }'

POST /v1/responses

curl https://api.cheaperinference.com/v1/responses \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "input": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "model": "grok-4.20-reasoning-beta",    "store": false  }'

POST /v1/messages

curl https://api.cheaperinference.com/v1/messages \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "grok-4.20-reasoning-beta",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "max_tokens": 1024  }'