feat: add grok-4.6 xhigh reasoning effort - #901
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Grok 4.6 accepts xhigh as a real thinking level. Keep it on the Build request path and generate grok-4.6-xhigh aliases instead of downgrading unknown-model xhigh to high. Unverified max stays guarded.
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August 13, 2026 01:13
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What changed
grok-4.6as a model that actually acceptslow / medium / high / xhigh.reasoning.effort: "xhigh"tohighfor this model.grok-4.6-low|medium|high|xhighaliases from/v1/modelswhen the base model is available.Why
Grok 4.6 supports extra-high thinking. Before this change it was treated as an unknown model, so client
xhigh/grok-4.6-xhighrequests were defensively downgraded tohigh. That made Codex-stylereasoning.effort=xhighsilently weaker than requested.Related: #897
Impact
model: "grok-4.6"withreasoning.effort: "xhigh"(orgrok-4.6-xhigh) and the upstream Build payload keepsxhigh.grok-4.5and unknown models still downgradexhigh/maxtohigh.maxon grok-4.6 still maps tohigh.Validation
go testshowedgrok-4.6levels=noneand Build normalizexhigh→high.go test ./internal/domain/model ./internal/infra/provider/cli ./internal/infra/provider/console ./internal/transport/http/inference -count=1go veton the same packages