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langchain-core 1.6.3 lets a gateway response override the model name and provider in tracing metadata
Released 2026-09-11, langchain-core 1.6.3 carries one functional change, #40406, allowing model name and provider tracing metadata to be overridden based on the gateway response rather than the configured value. That matters when a router or gateway silently substitutes a different model than the caller asked for, which previously left traces attributing tokens and latency to the wrong model. The rest of the release is a test covering the deprecated `.text()` access path and docs cleanup.
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