diff --git a/packages/test/src/test/ai-provider-api/LongContextPricing.test.ts b/packages/test/src/test/ai-provider-api/LongContextPricing.test.ts
index 1c787ee8d..630cd2e55 100644
--- a/packages/test/src/test/ai-provider-api/LongContextPricing.test.ts
+++ b/packages/test/src/test/ai-provider-api/LongContextPricing.test.ts
@@ -75,6 +75,9 @@ describe("Gemini long-context pricing", () => {
 describe("OpenAI long-context pricing", () => {
   const longContext = [
     { id: "gpt-6-astra", short: 10, long: 20, longOutput: 75 },
+    { id: "gpt-6.1-sol", short: 2, long: 4, longOutput: 15 },
+    { id: "gpt-6-sol", short: 2, long: 4, longOutput: 15 },
+    { id: "gpt-6-luna", short: 0.1, long: 0.2, longOutput: 0.75 },
     { id: "gpt-5.6-sol", short: 4, long: 8, longOutput: 30 },
     { id: "gpt-5.6-terra", short: 2, long: 4, longOutput: 18 },
     { id: "gpt-5.6-luna", short: 0.2, long: 0.4, longOutput: 1.8 },
diff --git a/packages/test/src/test/ai-provider-api/ModelSearchPricing.test.ts b/packages/test/src/test/ai-provider-api/ModelSearchPricing.test.ts
index 3b59a29e1..1b0cf9258 100644
--- a/packages/test/src/test/ai-provider-api/ModelSearchPricing.test.ts
+++ b/packages/test/src/test/ai-provider-api/ModelSearchPricing.test.ts
@@ -247,6 +247,7 @@ describe("a rate card must match the model's billing unit", () => {
    */
   it.each([
     ["gpt-6-astra", 10, 12.5],
+    ["gpt-6.1-sol", 2, 2.5],
     ["gpt-5.6-sol", 4, 5],
     ["gpt-5.6-terra", 2, 2.5],
     ["gpt-5.6-luna", 0.2, 0.25],
diff --git a/packages/test/src/test/ai-provider-api/OpenAiEffortPolicy.test.ts b/packages/test/src/test/ai-provider-api/OpenAiEffortPolicy.test.ts
index bd37b5d74..00091cf31 100644
--- a/packages/test/src/test/ai-provider-api/OpenAiEffortPolicy.test.ts
+++ b/packages/test/src/test/ai-provider-api/OpenAiEffortPolicy.test.ts
@@ -40,6 +40,10 @@ describe("openaiEffortPolicy", () => {
     });
   });
 
+  it("treats gpt-6.1-sol like gpt-6", () => {
+    expect(openaiEffortPolicy(cfg("gpt-6.1-sol"))).toEqual(openaiEffortPolicy(cfg("gpt-6-astra")));
+  });
+
   it("returns no levels for embeddings, image, and gpt-4o", () => {
     expect(openaiEffortPolicy(cfg("text-embedding-3-small"))?.supported).toEqual([]);
     expect(openaiEffortPolicy(cfg("gpt-image-2"))?.supported).toEqual([]);
diff --git a/packages/test/src/test/ai-provider/OpenAI_ReasoningTemperature.test.ts b/packages/test/src/test/ai-provider/OpenAI_ReasoningTemperature.test.ts
index 49a7f1721..23ed0e122 100644
--- a/packages/test/src/test/ai-provider/OpenAI_ReasoningTemperature.test.ts
+++ b/packages/test/src/test/ai-provider/OpenAI_ReasoningTemperature.test.ts
@@ -5,8 +5,30 @@
  */
 
 import { _testOnly } from "@workglow/openai/ai";
-import { describe, expect, it } from "vitest";
-const { finalizeResponsesRequest } = _testOnly;
+import { setLogger } from "@workglow/util";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+const { finalizeResponsesRequest, _resetOpenAIResponsesWarnings } = _testOnly;
+
+const warn = vi.fn();
+const logger = {
+  debug: () => {},
+  info: () => {},
+  warn,
+  error: () => {},
+  fatal: () => {},
+  child: () => logger,
+  time: () => {},
+  timeEnd: () => {},
+  group: () => {},
+  groupEnd: () => {},
+};
+
+beforeEach(() => {
+  warn.mockClear();
+  _resetOpenAIResponsesWarnings();
+  setLogger(logger as never);
+});
+afterEach(() => setLogger(undefined as never));
 
 /**
  * `temperature` and `reasoning` are not independently selectable on the OpenAI
@@ -30,10 +52,20 @@ describe("finalizeResponsesRequest on a reasoning model", () => {
     expect(params.reasoning).toEqual({ effort: "medium" });
   });
 
-  it("sends the default and drops a pinned temperature rather than turning reasoning off", () => {
-    const params = finalizeResponsesRequest(luna(), { model: "gpt-5.6-luna", temperature: 0.7 });
+  it("turns reasoning off to honour a pinned temperature when no effort is configured", () => {
+    const params = finalizeResponsesRequest(luna(), { model: "gpt-5.6-luna", temperature: 0 });
+    expect(params).toMatchObject({ reasoning: { effort: "none" }, temperature: 0 });
+    expect(warn).not.toHaveBeenCalled();
+  });
+
+  it("keeps the default effort when effort_options leave none out, and warns on the drop", () => {
+    const params = finalizeResponsesRequest(luna({ effort_options: ["medium", "high"] }), {
+      model: "gpt-5.6-luna",
+      temperature: 0.7,
+    });
     expect(params.reasoning).toEqual({ effort: "medium" });
     expect(params.temperature).toBeUndefined();
+    expect(warn).toHaveBeenCalledTimes(1);
   });
 
   it("maps model.effort over the class default", () => {
@@ -48,6 +80,8 @@ describe("finalizeResponsesRequest on a reasoning model", () => {
     });
     expect(params.reasoning).toEqual({ effort: "high" });
     expect(params.temperature).toBeUndefined();
+    expect(warn).toHaveBeenCalledTimes(1);
+    expect(warn.mock.calls[0][0]).toContain("temperature");
   });
 
   it("keeps the temperature alongside an effort of none", () => {
@@ -80,6 +114,7 @@ describe("finalizeResponsesRequest on a model that cannot turn reasoning off", (
     const params = finalizeResponsesRequest(astra(), { model: "gpt-6-astra", temperature: 0.4 });
     expect(params.reasoning).toEqual({ effort: "medium" });
     expect(params.temperature).toBeUndefined();
+    expect(warn).toHaveBeenCalledTimes(1);
   });
 
   it("does not map model.effort none onto the request", () => {
@@ -129,3 +164,34 @@ describe("finalizeResponsesRequest on a model that takes no reasoning", () => {
     expect(params.temperature).toBe(0.4);
   });
 });
+
+describe("finalizeResponsesRequest across model classes with a pinned temperature", () => {
+  it("drops it and warns on gpt-6.1-sol, which cannot turn reasoning off", () => {
+    const params = finalizeResponsesRequest(
+      { provider_config: { model_name: "gpt-6.1-sol" } } as never,
+      { model: "gpt-6.1-sol", temperature: 0 }
+    );
+    expect(params.reasoning).toEqual({ effort: "medium" });
+    expect(params.temperature).toBeUndefined();
+    expect(warn).toHaveBeenCalledTimes(1);
+  });
+
+  it("drops it and warns on an o-series model rather than sending effort none", () => {
+    const params = finalizeResponsesRequest({ provider_config: { model_name: "o3" } } as never, {
+      model: "o3",
+      temperature: 0,
+    });
+    expect(params.reasoning).toEqual({ effort: "medium" });
+    expect(params.temperature).toBeUndefined();
+    expect(warn).toHaveBeenCalledTimes(1);
+  });
+
+  it("drops it and warns on gpt-5.5 rather than sending effort none", () => {
+    const params = finalizeResponsesRequest(
+      { provider_config: { model_name: "gpt-5.5" } } as never,
+      { model: "gpt-5.5", temperature: 0 }
+    );
+    expect(params.reasoning).toEqual({ effort: "medium" });
+    expect(params.temperature).toBeUndefined();
+  });
+});
diff --git a/providers/openai/src/ai/common/OpenAI_Client.ts b/providers/openai/src/ai/common/OpenAI_Client.ts
index 29374f225..0eff56064 100644
--- a/providers/openai/src/ai/common/OpenAI_Client.ts
+++ b/providers/openai/src/ai/common/OpenAI_Client.ts
@@ -8,6 +8,7 @@ import { isBrowserLike, resolveApiKey, validateProviderBaseUrl } from "@workglow
 import { resolveEnabledEffort, type ModelEffort } from "@workglow/ai/worker";
 import { openaiEffortPolicy } from "./OpenAI_EffortPolicy";
 import type { OpenAiModelConfig } from "./OpenAI_ModelSchema";
+import { warnTemperatureDroppedOnce } from "./OpenAI_ResponsesWarnings";
 
 /** Maps coarse {@link ModelEffort} to OpenAI Responses `reasoning.effort`. */
 const EFFORT_TO_OPENAI: Record<ModelEffort, string> = {
@@ -177,6 +178,10 @@ export function resolvePromptCacheKey(
   return `wg-${fnv1aHex(material)}`;
 }
 
+function getModelId(model: OpenAiModelConfig | undefined): string {
+  return model?.provider_config?.model_name ?? "";
+}
+
 /**
  * Applies the per-request Responses fields common to every OpenAI text run-fn:
  * the model's `reasoning` config and a stable `prompt_cache_key`. Mutates and
@@ -193,8 +198,10 @@ export function resolvePromptCacheKey(
  *
  * `temperature` is rejected alongside any reasoning effort but `"none"` —
  * verified live against `gpt-5.6-luna` and `gpt-6-astra` — so it is dropped
- * whenever reasoning is on rather than failing the request. To sample at a
- * pinned temperature, set the effort to `none` on a model that allows it.
+ * whenever reasoning is on rather than failing the request, with a warning.
+ * A pinned temperature with no effort configured keeps reasoning off only on
+ * the GPT-5.6 family, where `none` plus a temperature is accepted; any other
+ * model is not guessed at, so its temperature is dropped.
  */
 export function finalizeResponsesRequest(
   model: OpenAiModelConfig | undefined,
@@ -202,12 +209,28 @@ export function finalizeResponsesRequest(
 ): Record<string, unknown> {
   const policy = openaiEffortPolicy(model);
   const fallback = resolveEnabledEffort({ ...model, effort: policy.default }, policy);
+  const configured = getReasoningConfig(model);
+  const canDisable =
+    /^gpt-5\.6/i.test(getModelId(model)) &&
+    policy.supported.includes("none") &&
+    resolveEnabledEffort({ ...model, effort: "none" }, policy) === "none";
   const reasoning =
-    getReasoningConfig(model) ??
-    (fallback !== undefined ? { effort: EFFORT_TO_OPENAI[fallback] } : undefined);
+    configured ??
+    (params.temperature !== undefined && canDisable
+      ? { effort: EFFORT_TO_OPENAI.none }
+      : fallback !== undefined
+        ? { effort: EFFORT_TO_OPENAI[fallback] }
+        : undefined);
   if (reasoning !== undefined) {
     params.reasoning = reasoning;
-    if (reasoning.effort !== "none") delete params.temperature;
+    if (reasoning.effort !== "none" && params.temperature !== undefined) {
+      const requested = params.model;
+      warnTemperatureDroppedOnce(
+        typeof requested === "string" ? requested : getModelId(model),
+        reasoning.effort
+      );
+      delete params.temperature;
+    }
   }
   params.prompt_cache_key = resolvePromptCacheKey(model, params);
   return params;
diff --git a/providers/openai/src/ai/common/OpenAI_ModelSearch.ts b/providers/openai/src/ai/common/OpenAI_ModelSearch.ts
index 0cda41a2e..68a4ef05f 100644
--- a/providers/openai/src/ai/common/OpenAI_ModelSearch.ts
+++ b/providers/openai/src/ai/common/OpenAI_ModelSearch.ts
@@ -24,6 +24,7 @@ interface OpenAiModelListItem {
 
 const OPENAI_FALLBACK: Array<{ label: string; value: string }> = [
   { label: "gpt-6-astra", value: "gpt-6-astra" },
+  { label: "gpt-6.1-sol", value: "gpt-6.1-sol" },
   { label: "gpt-6-sol", value: "gpt-6-sol" },
   { label: "gpt-6-luna", value: "gpt-6-luna" },
   { label: "gpt-image-2.5-sunburst", value: "gpt-image-2.5-sunburst" },
diff --git a/providers/openai/src/ai/common/OpenAI_Pricing.ts b/providers/openai/src/ai/common/OpenAI_Pricing.ts
index d78979630..61ce419ca 100644
--- a/providers/openai/src/ai/common/OpenAI_Pricing.ts
+++ b/providers/openai/src/ai/common/OpenAI_Pricing.ts
@@ -100,6 +100,7 @@ function gptImageCard(): ModelPricing {
  */
 export const OPENAI_PRICING: Record<string, ModelPricing> = {
   "gpt-6-astra": flagshipCard({ input: 10, output: 50, cached: 1, cacheWrite: 12.5 }),
+  "gpt-6.1-sol": flagshipCard({ input: 2, output: 10, cached: 0.1, cacheWrite: 2.5 }),
   "gpt-6-sol": flagshipCard({ input: 2, output: 10, cached: 0.2, cacheWrite: 2.5 }),
   "gpt-6-luna": flagshipCard({ input: 0.1, output: 0.5, cached: 0.01, cacheWrite: 0.125 }),
   "gpt-5.6-sol": flagshipCard({ input: 4, output: 20, cached: 0.4, cacheWrite: 5 }),
diff --git a/providers/openai/src/ai/common/OpenAI_ResponsesWarnings.ts b/providers/openai/src/ai/common/OpenAI_ResponsesWarnings.ts
index f5c557984..ddf3411ba 100644
--- a/providers/openai/src/ai/common/OpenAI_ResponsesWarnings.ts
+++ b/providers/openai/src/ai/common/OpenAI_ResponsesWarnings.ts
@@ -50,8 +50,22 @@ export function warnStrictDowngradedOnce(model: string, reason: string): void {
   );
 }
 
-/** @internal test helper — clear both dedupe sets. */
+const warnedTemperatureDrops = new Set<string>();
+
+export function warnTemperatureDroppedOnce(model: string, effort: string | undefined): void {
+  const key = `${model}::${effort ?? ""}`;
+  if (warnedTemperatureDrops.has(key)) return;
+  warnedTemperatureDrops.add(key);
+  getLogger().warn(
+    `OpenAI model "${model}" rejects temperature alongside reasoning` +
+      (effort ? ` effort "${effort}"` : "") +
+      `; the pinned temperature has been dropped.`
+  );
+}
+
+/** @internal test helper — clear all dedupe sets. */
 export function _resetOpenAIResponsesWarnings(): void {
+  warnedTemperatureDrops.clear();
   warnedPenaltyDrops.clear();
   warnedStrictDownshifts.clear();
 }
diff --git a/providers/openai/src/ai/index.ts b/providers/openai/src/ai/index.ts
index f17ff4f8a..6d8ab3755 100644
--- a/providers/openai/src/ai/index.ts
+++ b/providers/openai/src/ai/index.ts
@@ -27,6 +27,7 @@ import {
   _resetOpenAIResponsesWarnings,
   warnPenaltyDroppedOnce,
   warnStrictDowngradedOnce,
+  warnTemperatureDroppedOnce,
 } from "./common/OpenAI_ResponsesWarnings";
 import { isStrictCompatibleSchema } from "./common/OpenAI_StructuredGeneration";
 import { OpenAiQueuedProvider } from "./OpenAiQueuedProvider";
@@ -44,6 +45,7 @@ export const _testOnly = {
   isStrictCompatibleSchema,
   warnPenaltyDroppedOnce,
   warnStrictDowngradedOnce,
+  warnTemperatureDroppedOnce,
   _resetOpenAIResponsesWarnings,
   setOpenAIClientForTests: clientTestOnly.setOpenAIClientForTests,
 } as const;