GPT-OS3-V2-8B-Base

GPT-OS3-V2-8B-Base

Still initialized from the pruned 8.4B/A3.6B GPT-OSS model but with a new chat template that lets you do:

>>> print(tokenizer.decode(tokenizer.apply_chat_template([
    {"role": "reasoning_effort", "content": "high"},
    {"role": "user", "content": "Write a Python function to calculate factorial"},
    {"role": "assistant", "content": "Here's a Python function to calculate factorial:"},
    {"role": "user", "content": "Write a Python function to calculate factorial"},
])))

=== OUTPUT ===
<|start|>system<|message|>You are ChatGPT, a large language model trained by OpenAI.
Knowledge cutoff: 2024-06
Current date: 2025-08-30

Reasoning: high

# Valid channels: analysis, commentary, final. Channel must be included for every message.<|end|><|start|>user<|message|>Write a Python function to calculate factorial<|end|><|start|>assistant<|channel|>final<|message|>Here's a Python function to calculate factorial:<|end|><|start|>user<|message|>Write a Python function to calculate factorial<|end|>