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SpaceXAI: Grok 4.20

x-ai/grok-4.20

text imageContext 2M

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

Price

Input$1.25

per 1M tokens

Output$2.5

per 1M tokens

Compare this model

Providers

Each row is one seller. Prices are the published rate from that source. A dash means that source did not publish the amount. Sorted by a 3:1 blend of input and output.

ProviderTagQuant InputOutput ContextUptimeStatusSource
xAI xai — $1.25/1M $2.5/1M 2M 100% Live openrouter-endpoints
xAI xai/zdr — $1.25/1M $2.5/1M 2M 100% Live openrouter-endpoints
xAI xai/priority — $2.5/1M $5/1M 2M — Live openrouter-endpoints
xAI xai/zdr/priority — $2.5/1M $5/1M 2M — Live openrouter-endpoints

Monthly bill

Token models use the token counts. Image, video, and audio models use units times the flat rate.

$3.75 at list price for this workload

Cache

Cache read$0.2

per 1M tokens

Tiers

Web search
$0.005 per request
Above 200,000 prompt tokens
in $2.5 · out $5 · cache read $0.4
Every rate
UnitInputOutputFlatConfidence
token $1.25/1M $2.5/1M Not published— official

Price history

SpaceXAI: Grok 4.20
3 0 2026-09-15: $1.252026-09-16: $1.252026-09-17: $1.252026-09-18: $1.252026-09-19: $1.252026-09-20: $1.252026-09-21: $1.252026-09-22: $1.252026-09-23: $1.252026-09-24: $1.252026-09-25: $1.252026-09-26: $1.252026-09-27: $1.252026-09-28: $1.252026-09-29: $1.252026-09-30: $1.252026-10-01: $1.252026-10-02: $1.252026-10-03: $1.252026-10-04: $1.252026-10-05: $1.252026-10-06: $1.252026-10-07: $1.252026-10-08: $1.252026-10-09: $1.252026-10-10: $1.252026-10-11: $1.252026-10-12: $1.252026-10-13: $1.252026-10-14: $1.252026-10-15: $1.252026-10-16: $1.252026-10-17: $1.252026-10-18: $1.252026-10-19: $1.252026-10-20: $1.252026-10-21: $1.252026-10-22: $1.252026-10-23: $1.252026-10-24: $1.252026-10-25: $1.252026-10-26: $1.252026-10-27: $1.252026-10-28: $1.252026-10-29: $1.252026-10-30: $1.25 2026-09-15 2026-10-30

input or flat output

Daily snapshots
UTC dateUnitInputOutputFlat
2026-09-15 token $1.25 $2.5 Not published—
2026-09-16 token $1.25 $2.5 Not published—
2026-09-17 token $1.25 $2.5 Not published—
2026-09-18 token $1.25 $2.5 Not published—
2026-09-19 token $1.25 $2.5 Not published—
2026-09-20 token $1.25 $2.5 Not published—
2026-09-21 token $1.25 $2.5 Not published—
2026-09-22 token $1.25 $2.5 Not published—
2026-09-23 token $1.25 $2.5 Not published—
2026-09-24 token $1.25 $2.5 Not published—
2026-09-25 token $1.25 $2.5 Not published—
2026-09-26 token $1.25 $2.5 Not published—
2026-09-27 token $1.25 $2.5 Not published—
2026-09-28 token $1.25 $2.5 Not published—
2026-09-29 token $1.25 $2.5 Not published—
2026-09-30 token $1.25 $2.5 Not published—
2026-10-01 token $1.25 $2.5 Not published—
2026-10-02 token $1.25 $2.5 Not published—
2026-10-03 token $1.25 $2.5 Not published—
2026-10-04 token $1.25 $2.5 Not published—
2026-10-05 token $1.25 $2.5 Not published—
2026-10-06 token $1.25 $2.5 Not published—
2026-10-07 token $1.25 $2.5 Not published—
2026-10-08 token $1.25 $2.5 Not published—
2026-10-09 token $1.25 $2.5 Not published—
2026-10-10 token $1.25 $2.5 Not published—
2026-10-11 token $1.25 $2.5 Not published—
2026-10-12 token $1.25 $2.5 Not published—
2026-10-13 token $1.25 $2.5 Not published—
2026-10-14 token $1.25 $2.5 Not published—
2026-10-15 token $1.25 $2.5 Not published—
2026-10-16 token $1.25 $2.5 Not published—
2026-10-17 token $1.25 $2.5 Not published—
2026-10-18 token $1.25 $2.5 Not published—
2026-10-19 token $1.25 $2.5 Not published—
2026-10-20 token $1.25 $2.5 Not published—
2026-10-21 token $1.25 $2.5 Not published—
2026-10-22 token $1.25 $2.5 Not published—
2026-10-23 token $1.25 $2.5 Not published—
2026-10-24 token $1.25 $2.5 Not published—
2026-10-25 token $1.25 $2.5 Not published—
2026-10-26 token $1.25 $2.5 Not published—
2026-10-27 token $1.25 $2.5 Not published—
2026-10-28 token $1.25 $2.5 Not published—
2026-10-29 token $1.25 $2.5 Not published—
2026-10-30 token $1.25 $2.5 Not published—

Alternatives

Parameters (12)
include_reasoninglogprobsmax_tokensreasoningresponse_formatseedstructured_outputstemperaturetool_choicetoolstop_logprobstop_p
Call this model

OpenRouter id x-ai/grok-4.20. InferenceList does not send the request.

curl 
curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"x-ai/grok-4.20","messages":[{"role":"user","content":"Hello"}]}'

JavaScript 
await fetch("https://openrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: "Bearer " + process.env.OPENROUTER_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "x-ai/grok-4.20",
    messages: [{ role: "user", content: "Hello" }],
  }),
});

Python 
import os, json, urllib.request
req = urllib.request.Request(
    "https://openrouter.ai/api/v1/chat/completions",
    data=json.dumps({"model": "x-ai/grok-4.20", "messages": [{"role": "user", "content": "Hello"}]}).encode(),
    headers={"Authorization": "Bearer " + os.environ["OPENROUTER_API_KEY"], "Content-Type": "application/json"},
)
print(urllib.request.urlopen(req).read().decode())

JSON · History JSON