Grok 4.20
xAI · Released Mar 2026 · grok-4.20-0309-reasoning
$1.25
Input price / 1M tokens
#27 of 61, cheapest first
$2.50
Output price / 1M tokens
#14 of 61, cheapest first
1M
Context window
#29 of 71
115
Output tokens / second
#25 of 61
Summary
Grok 4.20 is a proprietary model from xAI, released on Mar 2026.
At $1.25 input and $2.50 output per million tokens, it is #27 of 61 on input price, cheapest first.
Its 1M-token context window ranks #29 of 71.
Measured output speed is 115 tokens per second, #25 of 61.
xAI describes Grok 4.20 as a fast model with strong agentic tool calling, a low hallucination rate and strict prompt adherence. It ships as reasoning, non-reasoning and multi-agent variants.
Benchmarks · 0 reported
No benchmark score we could source for this model. We show scores only with a source link.
Sources
- price, cached price, long-context tier, 20% batch discount: docs.x.ai/developers/pricing, checked 2 Oct 2026
- API ID, aliases, 1M context, modalities: docs.x.ai/developers/models/grok-4.20-0309-reasoning, checked 2 Oct 2026
- launch month (March 2026): docs.x.ai/developers/release-notes, checked 2 Oct 2026
- output speed: artificialanalysis.ai/models/grok-4-20, checked 2 Oct 2026
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