Diego Rodrigues de Sa e Souza 2ef88763e4 feat(xai): route xAI clients to Grok native /v1/responses endpoint (#6709) ...

* feat(xai): route xAI clients to Grok native /v1/responses endpoint

xAI ships a native /v1/responses endpoint (https://api.x.ai/v1/responses)
alongside /v1/chat/completions, but XaiExecutor extended BaseExecutor
without overriding buildUrl(), so every request always resolved to the
static chat-completions baseUrl regardless of target format — the last
genuinely-missing slice of decolua/9router#2439 (grok-build-0.1, the
reasoning-effort suffix routing, and bare grok-* routing were already
ported in prior cycles).

Add responsesBaseUrl to the xai registry entry and tag
grok-4.20-multi-agent-0309 (upstream's own Responses-only id) with
targetFormat: "openai-responses", mirroring the existing model-tag-driven
routing pattern already used by the gh executor (9router#102) and the
"openai" -pro heuristic in open-sse/executors/default.ts — the per-model
registry tag is the single source of truth that also drives chatCore's
body translation, so URL and body stay in lockstep. XaiExecutor.buildUrl
now checks getModelTargetFormat("xai", model) and resolves to the native
Responses endpoint only for tagged models, leaving every other grok-*
model on the existing chat-completions bridge.

TDD: tests/unit/executor-xai.test.ts adds a RED-then-GREEN case asserting
grok-4.20-multi-agent-0309 resolves to https://api.x.ai/v1/responses and
a control case asserting grok-4.3 still resolves to
https://api.x.ai/v1/chat/completions.

Co-authored-by: ryanngit <74137224+ryanngit@users.noreply.github.com>
Inspired-by: https://github.com/decolua/9router/pull/2439

* chore(6709): re-sync onto release tip; CHANGELOG → changelog.d fragment (fragments-first)

---------

Co-authored-by: ryanngit <74137224+ryanngit@users.noreply.github.com>

2026-07-10 19:44:06 -03:00

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