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Grok 4.20 Reasoning

Also accepted:x-ai/grok-4.20-0309-reasoning
XAI
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xAI's Grok 4.20 reasoning snapshot (March 2026) featuring extended step-by-step thinking for complex problem-solving, mathematics, and scientific reasoning tasks.

Providers
Capabilities
xAI
xai-byok
$0
$0
$0
Unavailable
OpenRouter
openrouter-byok
$0
$0
—
Unavailable
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API & code
Uptime & Health
No uptime data yet

These providers haven't been health-probed for this model yet. The router still routes around upstreams that fail live requests — uptime fills in once probe history accrues.

Share cards
Grok 4.20 Reasoning share card
Grok 4.20 Reasoning
xAI upstream share card
xAI upstream
OpenRouter upstream share card
OpenRouter upstream
Credits
Use your own key

Run Grok 4.20 Reasoning on your own key — your requests are billed by the provider. Pool callers pay AnyRouter credits.

No BYOK keys configured for this model yet.

Share a key with the pool to earn credits for every request it serves, covering your plan cost.

Text generation
Context length1,000,000 tokens
Max output800,000 tokens
ArchitectureTransformer
Categorytext
ReleasedMar 10, 2026
Modalities
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