fix(ai): parse compatible reasoning deltas (#37558)
Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
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5 changed files with 200 additions and 28 deletions
34
packages/ai/test/fixtures/recordings/openrouter-reasoning.json
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34
packages/ai/test/fixtures/recordings/openrouter-reasoning.json
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@ -0,0 +1,34 @@
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{
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"version": 1,
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"metadata": {
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"model": "anthropic/claude-sonnet-4.6",
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"tags": [
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"prefix:openai-compatible-chat",
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"provider:openrouter",
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"protocol:openai-chat",
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"reasoning"
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],
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"name": "openrouter-reasoning",
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"recordedAt": "2026-07-18T11:28:39.267Z"
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},
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"interactions": [
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{
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"transport": "http",
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"request": {
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"method": "POST",
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"url": "https://openrouter.ai/api/v1/chat/completions",
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"headers": {
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"content-type": "application/json"
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},
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"body": "{\"model\":\"anthropic/claude-sonnet-4.6\",\"messages\":[{\"role\":\"system\",\"content\":\"Think through the arithmetic, then reply with only the final integer.\"},{\"role\":\"user\",\"content\":\"What is 173 multiplied by 219?\"}],\"stream\":true,\"stream_options\":{\"include_usage\":true},\"max_tokens\":1536,\"temperature\":0,\"reasoning\":{\"max_tokens\":1024}}"
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},
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"response": {
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"status": 200,
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"headers": {
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"content-type": "text/event-stream"
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},
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"body": ": OPENROUTER PROCESSING\n\n: OPENROUTER PROCESSING\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\"173\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"173\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\n: OPENROUTER PROCESSING\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460 - 173 = 3,287\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460 - 173 = 3,287\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\"\\n\\n34,600 + 3,287 = 37,887\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"\\n\\n34,600 + 3,287 = 37,887\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"signature\":\"EtgCCosBCA8YAipA0W4viH3kgBs43Cl5ewwVBPXTQElvzfbA2TLF4iSbKy9ZZDCSDjjAlF3Bs4ELEnP3vrrTuTioC6OB380lXQdyIDIRY2xhdWRlLXNvbm5ldC00LTY4AEIIdGhpbmtpbmdaJDRjMGYwNDZmLTI1ZmQtNDVmYi1iZmIzLWEwOGE4ZTI0OWNhNxIMMiUlJC3x/5p5PuTwGgwlc8eipZyoM94BHwMiMO45uQx/ymeOjbugi7RDVPZ4jZXSIiEbVi2CD7zPjAK5fFQoVGP1HD55v9CER823JCp6Dg5Xb7Lrk6NUd1XN2KTKrttK7mATE+IBrDTFmor/1cNeg+9gjIbxM/jn/6L5HPmh3/esEVu24Q0IGLZVoE7cTgGgxsrceKMD71Jp2XQgIWD8ltsPfWw3gSc4p+z18UuPN6LuR0mHHENTnClHrAPnOrxbDIl4ZwZgMX8YAQ==\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"37887\",\"role\":\"assistant\"},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":null},\"finish_reason\":\"stop\",\"native_finish_reason\":\"end_turn\"}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"service_tier\":\"default\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\"},\"finish_reason\":\"stop\",\"native_finish_reason\":\"end_turn\"}],\"usage\":{\"prompt_tokens\":61,\"completion_tokens\":80,\"total_tokens\":141,\"cost\":0.001383,\"is_byok\":false,\"prompt_tokens_details\":{\"cached_tokens\":0,\"cache_write_tokens\":0,\"audio_tokens\":0,\"video_tokens\":0},\"cache_creation\":{\"ephemeral_5m_input_tokens\":0,\"ephemeral_1h_input_tokens\":0},\"cost_details\":{\"upstream_inference_cost\":0.001383,\"upstream_inference_prompt_cost\":0.000183,\"upstream_inference_completions_cost\":0.0012},\"completion_tokens_details\":{\"reasoning_tokens\":29,\"image_tokens\":0,\"audio_tokens\":0}}}\n\ndata: [DONE]\n\n"
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}
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}
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]
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}
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34
packages/ai/test/fixtures/recordings/vercel-ai-gateway-reasoning.json
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34
packages/ai/test/fixtures/recordings/vercel-ai-gateway-reasoning.json
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import { describe, expect } from "bun:test"
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import { Effect } from "effect"
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import { LLM, LLMEvent } from "../../src"
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import * as OpenAICompatible from "../../src/providers/openai-compatible"
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import * as OpenRouter from "../../src/providers/openrouter"
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import { LLMClient } from "../../src/route"
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import { recordedTests } from "../recorded-test"
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const cases = [
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{
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name: "OpenRouter",
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model: OpenRouter.configure({
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apiKey: process.env.OPENROUTER_API_KEY ?? "fixture",
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providerOptions: { openrouter: { reasoning: { max_tokens: 1024 } } },
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}).model("anthropic/claude-sonnet-4.6"),
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requires: ["OPENROUTER_API_KEY"],
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cassette: "openrouter-reasoning",
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},
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{
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name: "Vercel AI Gateway",
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model: OpenAICompatible.configure({
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provider: "vercel-ai-gateway",
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baseURL: "https://ai-gateway.vercel.sh/v1",
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apiKey: process.env.AI_GATEWAY_API_KEY ?? "fixture",
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http: { body: { reasoning: { enabled: true, max_tokens: 1024 } } },
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}).model("anthropic/claude-sonnet-4.6"),
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requires: ["AI_GATEWAY_API_KEY"],
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cassette: "vercel-ai-gateway-reasoning",
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},
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] as const
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for (const item of cases) {
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const recorded = recordedTests({
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prefix: "openai-compatible-chat",
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provider: item.model.provider,
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protocol: "openai-chat",
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requires: item.requires,
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tags: ["reasoning"],
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metadata: { model: item.model.id },
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})
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describe(`${item.name} reasoning recorded`, () => {
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recorded.effect.with(
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"streams scalar reasoning",
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{ cassette: item.cassette },
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() =>
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Effect.gen(function* () {
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const response = yield* LLMClient.generate(
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LLM.request({
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model: item.model,
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system: "Think through the arithmetic, then reply with only the final integer.",
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prompt: "What is 173 multiplied by 219?",
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generation: { maxTokens: 1536, temperature: 0 },
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}),
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)
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expect(response.text.replaceAll(",", "").trim()).toBe("37887")
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expect(response.reasoning.length).toBeGreaterThan(0)
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expect(response.events.some(LLMEvent.is.reasoningDelta)).toBe(true)
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expect(response.message.content.find((part) => part.type === "reasoning")?.providerMetadata).toEqual({
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openai: { reasoningField: "reasoning" },
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})
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}),
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30_000,
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)
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})
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}
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@ -540,29 +540,33 @@ describe("OpenAI Chat route", () => {
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}),
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)
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it.effect("parses OpenAI-compatible reasoning content deltas", () =>
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it.effect("parses and replays OpenAI-compatible reasoning fields", () =>
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Effect.gen(function* () {
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const body = sseEvents(
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{ choices: [{ delta: { reasoning_content: "thinking" } }] },
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{ choices: [{ delta: { content: "Hello" } }] },
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{ choices: [{ delta: {}, finish_reason: "stop" }] },
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)
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const fields = ["reasoning_content", "reasoning", "reasoning_text"] as const
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for (const field of fields) {
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const response = yield* LLMClient.generate(request).pipe(
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Effect.provide(
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fixedResponse(
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sseEvents(
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{ choices: [{ delta: { [field]: "thinking" } }] },
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{ choices: [{ delta: { content: "Hello" } }] },
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{ choices: [{ delta: {}, finish_reason: "stop" }] },
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),
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),
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),
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)
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const response = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(body)))
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expect(response.reasoning).toBe("thinking")
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expect(response.text).toBe("Hello")
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expect(response.message.content.find((part) => part.type === "reasoning")?.providerMetadata).toEqual({
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openai: { reasoningField: field },
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})
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expect(response.reasoning).toBe("thinking")
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expect(response.text).toBe("Hello")
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expect(response.events).toMatchObject([
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{ type: "step-start", index: 0 },
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{ type: "reasoning-start", id: "reasoning-0" },
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{ type: "reasoning-delta", id: "reasoning-0", text: "thinking" },
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{ type: "reasoning-end", id: "reasoning-0" },
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{ type: "text-start", id: "text-0" },
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{ type: "text-delta", id: "text-0", text: "Hello" },
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{ type: "text-end", id: "text-0" },
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{ type: "step-finish", index: 0, reason: "stop" },
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{ type: "finish", reason: "stop" },
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])
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const replay = yield* LLMClient.prepare<OpenAIChat.OpenAIChatBody>(
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LLM.request({ model, messages: [response.message] }),
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)
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expect(replay.body.messages).toEqual([{ role: "assistant", content: "Hello", [field]: "thinking" }])
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}
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}),
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)
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