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fix(openai): preserve reasoning for local OpenAI-compatible models via R1 toggle #1119

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fix(openai): preserve reasoning for local OpenAI-compatible models via R1 toggle #1119

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14 changes: 14 additions & 0 deletions src/api/providers/__tests__/openai.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -837,6 +837,20 @@ describe("OpenAiHandler", () => {
expect(model.id).toBe("")
expect(model.info).toBeDefined()
})

it("should set preserveReasoning when openAiR1FormatEnabled is on", () => {
const r1Handler = new OpenAiHandler({
...mockOptions,
openAiR1FormatEnabled: true,
})
const model = r1Handler.getModel()
expect(model.info.preserveReasoning).toBe(true)

@edelauna edelauna Aug 6, 2026

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This only checks preserveReasoning — would it still pass if the ...info spread got dropped (silently losing contextWindow/supportsImages)? Might be worth asserting the whole object.

Suggested change
expect(model.info.preserveReasoning).toBe(true)
expect(model.info).toEqual({ ...openAiModelInfoSaneDefaults, preserveReasoning: true })

})

it("should not set preserveReasoning by default", () => {
const model = handler.getModel()
expect(model.info.preserveReasoning).toBeUndefined()
})
})

describe("Azure AI Inference Service", () => {
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10 changes: 9 additions & 1 deletion src/api/providers/openai.ts
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Expand Up @@ -293,7 +293,15 @@ export class OpenAiHandler extends BaseProvider implements SingleCompletionHandl
settings: this.options,
defaultTemperature: 0,
})
return { id, info, ...params }
// Local OpenAI-compatible reasoning models (llama.cpp, LM Studio, Ollama)
// stream reasoning_content, but Roo strips it from the follow-up context
// unless info.preserveReasoning is set. When the user enables the R1 format
// toggle, treat the model as preserving reasoning so the chain is fed back.
return {
id,
info: this.options.openAiR1FormatEnabled ? { ...info, preserveReasoning: true } : info,

@edelauna edelauna Aug 6, 2026

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createMessage() treats a model as R1-format via modelId.includes("deepseek-reasoner") || enabledR1Format (line 90), but this gate only checks the toggle. If someone points openAiModelId at a custom endpoint whose id contains deepseek-reasoner without flipping the toggle, wouldn't createMessage still use R1 conversion while preserveReasoning never gets set here — leaving the original bug open for that case?

@edelauna edelauna Aug 6, 2026

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This forces preserveReasoning: true whenever the toggle is on, even if openAiCustomModelInfo.preserveReasoning was explicitly set to false. Should an explicit value win here, e.g. info.preserveReasoning ?? true?

...params,
}
}

async completePrompt(prompt: string, options?: CompletePromptOptions): Promise<string> {
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