From 4efab856d21a32efe06b33040db7b01f90153e11 Mon Sep 17 00:00:00 2001
From: Yunare Maia <yunare@gmail.com>
Date: Mon, 24 Aug 2026 17:39:39 +0000
Subject: [PATCH 1/2] fix(core): include 'low' effort for deepseek-v4-flash

The official Thinking Mode guide accepts reasoning_effort low/high/max and
states the effort mapping is identical for deepseek-v4-flash and
deepseek-v4-pro; the deepseek-v4-pro entry here already pins the full set.
The pinned ['high','max'] predates the 0731 refresh of this model.
---
 packages/core/src/model-metadata.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/model-metadata.ts b/packages/core/src/model-metadata.ts
index 5d65b8fc4a..5949b79fad 100644
--- a/packages/core/src/model-metadata.ts
+++ b/packages/core/src/model-metadata.ts
@@ -432,7 +432,8 @@ const STATIC_MODEL_METADATA: Partial<Record<ProviderType, Record<string, ModelMe
   deepseek: {
     'deepseek-v4-flash': {
       capabilities: { ...REASONING_FUNCTION_CALLING, webSearch: true },
-      thinkingOptions: { efforts: ['high', 'max'], toggle: true },
+      lastUpdated: '2026-08-24',
+      thinkingOptions: { efforts: ['low', 'high', 'max'], toggle: true },
     },
     'deepseek-v4-pro': {
       capabilities: { ...REASONING_FUNCTION_CALLING, webSearch: true },

From b74a137db644b71eafc6ace1772edf89a0fb21e3 Mon Sep 17 00:00:00 2001
From: Yunare Maia <yunare@gmail.com>
Date: Mon, 24 Aug 2026 18:00:42 +0000
Subject: [PATCH 2/2] test(runtime): cover 'low' effort for deepseek-v4-flash

Updates the thinking-variants assertion to the corrected catalog set
['low','high','max'], asserts reasoningEffort passthrough for 'low', and
drops 'low' from the unsupported-effort loop.
---
 .../runtime/src/__tests__/model-factory-thinking.test.ts   | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/runtime/src/__tests__/model-factory-thinking.test.ts b/packages/runtime/src/__tests__/model-factory-thinking.test.ts
index 793da8bec5..57b9dbe886 100644
--- a/packages/runtime/src/__tests__/model-factory-thinking.test.ts
+++ b/packages/runtime/src/__tests__/model-factory-thinking.test.ts
@@ -301,18 +301,21 @@ describe('buildProviderOptions: thinking level', () => {
     );
     assert.deepEqual(
       [...thinkingVariantsForModel('deepseek', 'deepseek-v4-flash')],
-      ['high', 'max'],
+      ['low', 'high', 'max'],
     );
     // DeepSeek V4 uses the generic Open Responses adapter, which passes a
     // provider-native reasoningEffort through verbatim: `max` stays `max`
     // (DeepSeek's documented mapping sends `xhigh` to high, not max).
+    assert.deepEqual(buildProviderOptions(conn('deepseek'), 'deepseek-v4-flash', 'low'), {
+      deepseek: { reasoningEffort: 'low' },
+    });
     assert.deepEqual(buildProviderOptions(conn('deepseek'), 'deepseek-v4-flash', 'high'), {
       deepseek: { reasoningEffort: 'high' },
     });
     assert.deepEqual(buildProviderOptions(conn('deepseek'), 'deepseek-v4-flash', 'max'), {
       deepseek: { reasoningEffort: 'max' },
     });
-    for (const unsupported of ['off', 'low', 'medium', 'minimal'] as const) {
+    for (const unsupported of ['off', 'medium', 'minimal'] as const) {
       assert.deepEqual(
         buildProviderOptions(conn('deepseek'), 'deepseek-v4-flash', unsupported),
         {},