Managed Research: Direct xAI Grok Build

TL;DR

• Hosted Managed Research supports Grok Build on direct xAI (x-ai/grok-build).
• Public Grok on SMR is Grok 4.3 + Grok Build; legacy Grok 4.1 / 4.20 ids are retired.
• synth-ai 0.11.7 adds Grok Build to the typed SDK/MCP surface.

What Shipped

Grok Build (direct xAI)

Hosted SMR can run on xAI Grok Build without OpenRouter or customer BYOK:

• Model id: x-ai/grok-build
• Platform profile: codex_xai_grok_build
• Routing: Synth-managed direct xAI (Codex-class harness)

Staging proof (api-dev): README smoke reached terminal done on profile codex_xai_grok_build (backend c8b1485c5).

Grok catalog cleanup

Public hosted Grok is simplified:

• Supported: x-ai/grok-4.3, x-ai/grok-build (both direct xAI)
• Retired from public catalog: x-ai/grok-4.1-fast, x-ai/grok-4.20-beta (backend aliases legacy references to 4.3 where needed)

Reliability

xAI-backed runs no longer send incompatible OpenAI penalty parameters that could break streaming or hide provider errors.

SDK

Install the release package:

pip install "synth-ai[research]==0.11.7"

New enum: SmrAgentModel.X_AI_GROK_BUILD.

Who This Affects

• Teams running hosted SMR on xAI Grok Build or Grok 4.3.
• SDK/MCP users who need typed model ids aligned with the prod catalog.
• Operators proving hosted README smoke on codex_xai_grok_build.

Out of Scope

This release does not change Open Research, Research Factory, or OpenRouter-backed demo paths.

Learn More

• Managed Research docs
• SDK changelog
• Managed Research in the product