Sync from v0.13

vllm/reasoning/seedoss_reasoning_parser.py

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+
+from vllm.reasoning.basic_parsers import BaseThinkingReasoningParser
+
+
+class SeedOSSReasoningParser(BaseThinkingReasoningParser):
+    """
+    Reasoning parser for SeedOSS model.
+
+    The SeedOSS model uses <seed:think>...</seed:think> tokens to
+    denote reasoning content text. This parser extracts
+    the reasoning content from the model output.
+    Similar to DeepSeek R1, it supports cases
+    where the model doesn't generate the start token.
+    """
+
+    @property
+    def start_token(self) -> str:
+        """The token that starts reasoning content."""
+        return "<seed:think>"
+
+    @property
+    def end_token(self) -> str:
+        """The token that ends reasoning content."""
+        return "</seed:think>"