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x-aix-ai·Mar 31, 2026

xAI: Grok 4.20

x-ai/grok-4.20
context
2M
Max Output
—
Input / 1M
$1.25
Output / 1M
$2.50

About

Grok 4.20 is xAI's flagship model, emphasizing inference speed and agentic tool calling. xAI positions it for strict prompt adherence and a low hallucination rate; on the Artificial Analysis Omniscience test it reached a 78% non-hallucination rate, the highest among models tested, and ranked second on tau-squared-Bench Telecom with 97% for agentic tool use. Reasoning can be enabled or disabled via the reasoning enabled parameter in the API. The model accepts text, image, and file inputs and supports a 2,000,000-token context window.

Capabilities

Context Length
2M
Max Output
—
Reasoning
Yes
In
text, image, file
Out
text

Benchmarks

View leaderboard
37.0#40 of 133
Intelligence Index
40.5#37 of 118
Coding Index

Reasoning & Knowledge

GPQA Diamond91.1%
HLE32.2%

Coding & Agentic

SciCode45.6%
Terminal-Bench Hard37.9%

Source: Artificial Analysis

Pricing

Full pricing
Type≤200K>200K
Input$1.25$2.50
Output$2.50$5.00
Cache Read$0.20$0.40
Web Search$0.0050 / call

API

API reference

OpenAI-compatible · Model ID x-ai/grok-4.20

curl https://api.elliotgate.com/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4.20",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

OFTEN COMPARED

Grok 4.20 comparisons

Decide which model wins on the dimensions that matter for your workload — context, benchmarks, pricing, or serving latency.