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SpaceXAI Grok 4.20

Use this guide to adopt Grok 4.20 safely through the Phaseo Gateway. Primary route in our catalog:
  • spacex-ai/grok-4-20-2026-02-17
Optional multi-agent route exposed by provider model ID:
  • spacex-ai/grok-4.20-multi-agent-beta-0309

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Migration quickstart

For most integrations, there is no required migration work beyond updating the model ID and re-running your normal validation set. Existing request and response patterns can remain the same.

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What’s new

For the base Grok 4.20 route, there is no behavior change you need to migrate for in Phaseo Gateway. The only practical change is how to tune the multi-agent variant. For Phaseo Gateway usage:
  • base Grok 4.20 can still be toggled with reasoning.enabled as normal
  • multi-agent Grok 4.20 should be tuned with reasoning.effort
  • use low, medium, high, and extra high
  • as described in SpaceXAI guidance, low and medium map to 4 agents, while high and extra high use higher multi-agent configurations
We do not use agent_count directly in gateway requests.

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Base Grok 4.20 with reasoning toggle

Use the base model and set reasoning.enabled directly:

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Multi-agent Grok 4.20 with effort control

Use the multi-agent model and control depth with reasoning.effort:
Reasoning effort tiers:
  • low
  • medium
  • high
  • extra high

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Sources

Last modified on October 18, 2026