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Azure provider: reasoningEffort model option silently ignored #20275
Description
Description
When using @ai-sdk/azure as a custom provider with model-level options like reasoningEffort, the option is silently dropped — reasoning_effort never appears in the outgoing HTTP request body.
Steps to reproduce
- Configure a custom Azure OpenAI provider with a model that sets
reasoningEffort:
{
"provider": {
"my-azure": {
"npm": "@ai-sdk/azure",
"options": { "baseURL": "https://my-endpoint.openai.azure.com" },
"models": {
"gpt-5.1-high": {
"id": "gpt-5.1",
"options": { "reasoningEffort": "high" }
}
}
}
}
}- Send a request and inspect the outgoing HTTP body
reasoning_effortis missing from the request
Root cause
In packages/opencode/src/provider/transform.ts, sdkKey("@ai-sdk/azure") returns "azure", so model options are wrapped as providerOptions["azure"].
However, @ai-sdk/azure delegates to OpenAIChatLanguageModel from @ai-sdk/openai, which hardcodes provider: 'openai' in parseProviderOptions — meaning it only reads from providerOptions["openai"].
The options end up under the wrong key and are silently ignored.
Expected behavior
reasoning_effort (and other model options) should be included in the request body when configured on an Azure provider model.
Activity
github-actions commentedon Mar 31, 2026
This issue might be a duplicate of existing issues. Please check:
[-]Azure provider: reasoningEffort model option silently ignored since v1.3.4[/-][+]Azure provider: reasoningEffort model option silently ignored[/+]fix: use openai key for Azure provider options
rekram1-node commentedon Mar 31, 2026
this may have fixed it:
4dd866d
meruiden commentedon Apr 1, 2026
Thanks for looking into this @rekram1-node!
I checked commit 4dd866d and it addresses a different issue — it removes the
@ai-sdk/azureexclusion from the message-levelproviderOptionsremapping (line ~295 intransform.ts). That fix ensures message/part-level options get remapped from a custom provider name to the SDK key.However, the
reasoningEffortbug is insdkKey()itself (line 29), which controls the model-levelproviderOptionskey — the one used when passing options likereasoningEfforttostreamText().sdkKey("@ai-sdk/azure")still returns"azure", butOpenAIChatLanguageModelfrom@ai-sdk/openaihardcodesprovider: 'openai'inparseProviderOptions, so it only reads fromproviderOptions["openai"].I verified on the latest
devbranch (with that commit included) thatreasoning_effortis still missing from the outgoing request body when using an Azure provider with"options": { "reasoningEffort": "medium" }.The fix in #20272 (changing
sdkKeyto return"openai"for@ai-sdk/azure) is still needed.