feat: add legacy /chat/completions support#1804

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chrisreadsf wants to merge 11 commits intomainfrom

chris/model-base-url

Commits on Mar 10, 2026

feat: support custom model base URL for OpenAI-compatible providers
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feat: add chatcompletions provider for OpenAI-compatible endpoints
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fix: remove stale zhipuai reference from comment
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fix: use schema-first fallback for chatcompletions no-schema path
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fix: add comments to no-schema fallback pipeline, restore codex comment
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fix: skip wasted schema call for chatcompletions, unify .chat() handling
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feat: add x-model-base-url header across client SDK, server-v4, OpenAPI specs, and stainless config
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chore: add server-v4 to changeset
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fix: remove ModelBaseUrl from required security schemes (it's optional)
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fix: add MODEL_BASE_URL as nullable client opt so Stainless generates it in SDKs
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chore: update changeset to reflect full modelBaseURL scope
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