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<h1 class="title">GPT-OSS</h1>
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<p><a href="https://huggingface.co/collections/openai/gpt-oss-68911959590a1634ba11c7a4">GPT-OSS</a> are a family of open-weight MoE models trained by OpenAI, released in August 2025. There are two variants: 20B and 120B.</p>
<p>In October 2025, OpenAI released safeguard models built upon GPT-OSS called <a href="https://huggingface.co/collections/openai/gpt-oss-safeguard">GPT-OSS-Safeguard</a>. They use the same architecture, so the same examples below can be re-used.</p>
<p>This guide shows how to fine-tune it with Axolotl with multi-turn conversations and proper masking.</p>
<section id="getting-started" class="level2">
<h2 class="anchored" data-anchor-id="getting-started">Getting started</h2>
<ol type="1">
<li><p>Install Axolotl following the <a href="https://docs.axolotl.ai/docs/installation.html">installation guide</a>.</p>
<p>Here is an example of how to install from pip:</p></li>
</ol>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb1"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="co"># Ensure you have Pytorch installed (Pytorch 2.9.1 min)</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="ex">uv</span> pip install <span class="at">--no-build-isolation</span> <span class="st">'axolotl&gt;=0.16.1'</span></span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<ol start="2" type="1">
<li>Choose one of the following configs below for training the 20B model. (for 120B, see <a href="#training-120b">below</a>)</li>
</ol>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb2"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="co"># LoRA SFT linear layers (1x48GB @ ~44GiB)</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="ex">axolotl</span> train examples/gpt-oss/gpt-oss-20b-sft-lora-singlegpu.yaml</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="co"># FFT SFT with offloading (2x24GB @ ~21GiB/GPU)</span></span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="ex">axolotl</span> train examples/gpt-oss/gpt-oss-20b-fft-fsdp2-offload.yaml</span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="co"># FFT SFT (8x48GB @ ~36GiB/GPU or 4x80GB @ ~46GiB/GPU)</span></span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="ex">axolotl</span> train examples/gpt-oss/gpt-oss-20b-fft-fsdp2.yaml</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>Note: Memory usage taken from <code>device_mem_reserved(gib)</code> from logs.</p>
<section id="training-120b" class="level3">
<h3 class="anchored" data-anchor-id="training-120b">Training 120B</h3>
<p>On 8xH100s, make sure you have ~3TB of free disk space. With each checkpoint clocking in at ~720GB, along with the base
model, and final model output, you may need at least 3TB of free disk space to keep at least 2 checkpoints.</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb3"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="co"># FFT SFT with offloading (8x80GB @ ~49GiB/GPU)</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="ex">axolotl</span> train examples/gpt-oss/gpt-oss-120b-fft-fsdp2-offload.yaml</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>To simplify fine-tuning across 2 nodes × 8x H100 (80GB) GPUs, weve partnered with <a href="https://baseten.co">Baseten</a> to showcase multi-node
training of the 120B model using Baseten Truss. You can read more about this recipe on
<a href="https://www.baseten.co/blog/how-to-fine-tune-gpt-oss-120b-with-baseten-and-axolotl/">Basetens blog</a>. The recipe can
be found on their
<a href="https://github.com/basetenlabs/ml-cookbook/tree/main/examples/oss-gpt-120b-axolotl/training">GitHub</a>.</p>
<p>ERRATA: Transformers saves the model Architecture prefixed with <code>FSDP</code> which needs to be manually renamed in <code>config.json</code>.
See https://github.com/huggingface/transformers/pull/40207 for the status of this issue.</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb4"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">sed</span> <span class="at">-i</span> <span class="st">'s/FSDPGptOssForCausalLM/GptOssForCausalLM/g'</span> ./outputs/gpt-oss-out/config.json</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>When using SHARDED_STATE_DICT with FSDP, the final checkpoint should automatically merge the sharded weights to your
configured <code>output_dir</code>. However, if that step fails due to a disk space error, you can take an additional step to
merge the sharded weights. This step will automatically determine the last checkpoint directory and merge the sharded
weights to <code>{output_dir}/merged</code>.</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb5"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="ex">axolotl</span> merge-sharded-fsdp-weights examples/gpt-oss/gpt-oss-120b-fft-fsdp2-offload.yaml</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="fu">mv</span> ./outputs/gpt-oss-out/merged/<span class="pp">*</span> ./outputs/gpt-oss-out/</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
</section>
<section id="how-to-set-reasoning_effort-in-template" class="level3">
<h3 class="anchored" data-anchor-id="how-to-set-reasoning_effort-in-template">How to set reasoning_effort in template?</h3>
<p>The harmony template has a feature to set the <code>reasoning_effort</code> during prompt building. The default is <code>medium</code>. If you would like to adjust this, you can add the following to your config:</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb6"><pre class="sourceCode yaml code-with-copy"><code class="sourceCode yaml"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">chat_template_kwargs</span><span class="kw">:</span></span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">reasoning_effort</span><span class="kw">:</span><span class="at"> </span><span class="st">"high"</span><span class="co"> # low | medium | high</span></span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>Currently, this applies globally. There is no method to apply per sample yet. If you are interested in adding this, please feel free to create an Issue to discuss.</p>
</section>
<section id="inferencing-your-fine-tuned-model" class="level3">
<h3 class="anchored" data-anchor-id="inferencing-your-fine-tuned-model">Inferencing your fine-tuned model</h3>
<section id="vllm" class="level4">
<h4 class="anchored" data-anchor-id="vllm">vLLM</h4>
<p>GPT-OSS support in vLLM does not exist in a stable release yet. See https://x.com/MaziyarPanahi/status/1955741905515323425
for more information about using a special vllm-openai docker image for inferencing with vLLM.</p>
<p>Optionally, vLLM can be installed from nightly:</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb7"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">uv</span> pip install <span class="at">--no-build-isolation</span> <span class="at">--pre</span> <span class="at">-U</span> vllm <span class="at">--extra-index-url</span> https://wheels.vllm.ai/nightly</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>and the vLLM server can be started with the following command (modify <code>--tensor-parallel-size 8</code> to match your environment):</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb8"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">vllm</span> serve ./outputs/gpt-oss-out/ <span class="at">--served-model-name</span> axolotl/gpt-oss-20b <span class="at">--host</span> 0.0.0.0 <span class="at">--port</span> 8888 <span class="at">--tensor-parallel-size</span> 8</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
</section>
<section id="sglang" class="level4">
<h4 class="anchored" data-anchor-id="sglang">SGLang</h4>
<p>SGLang has 0-day support in main, see https://github.com/sgl-project/sglang/issues/8833 for infomation on installing
SGLang from source. Once youve installed SGLang, run the following command to launch a SGLang server:</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb9"><pre class="sourceCode bash code-with-copy"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="ex">python3</span> <span class="at">-m</span> sglang.launch_server <span class="at">--model</span> ./outputs/gpt-oss-out/ <span class="at">--served-model-name</span> axolotl/gpt-oss-120b <span class="at">--host</span> 0.0.0.0 <span class="at">--port</span> 8888 <span class="at">--tp</span> 8</span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
</section>
</section>
<section id="tool-use" class="level3">
<h3 class="anchored" data-anchor-id="tool-use">Tool use</h3>
<p>GPT-OSS has a comprehensive tool understanding. Axolotl supports tool calling datasets for Supervised Fine-tuning.</p>
<p>Here is an example dataset config:</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode" id="cb10"><pre class="sourceCode yaml code-with-copy"><code class="sourceCode yaml"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">datasets</span><span class="kw">:</span></span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">path</span><span class="kw">:</span><span class="at"> Nanobit/text-tools-2k-test</span></span>
<span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">type</span><span class="kw">:</span><span class="at"> chat_template</span></span></code></pre></div><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></div>
<p>See <a href="https://huggingface.co/datasets/Nanobit/text-tools-2k-test">Nanobit/text-tools-2k-test</a> for the sample dataset.</p>
<p>Refer to <a href="https://docs.axolotl.ai/docs/dataset-formats/conversation.html#using-tool-use">our docs</a> for more info.</p>
</section>
<section id="thinking-and-chat_template-masking-conflict" class="level3">
<h3 class="anchored" data-anchor-id="thinking-and-chat_template-masking-conflict">Thinking and chat_template masking conflict</h3>
<p>OpenAIs Harmony template hides <code>thinking</code> in all non-final turns, which conflicts with Axolotls <code>chat_template</code> masking.</p>
<p>If your dataset has <code>thinking</code> content mid-turn, there are two paths we recommend:</p>
<ul>
<li><p>Train only on the last turn. This can be accomplished via chat_templates <a href="https://docs.axolotl.ai/docs/dataset-formats/conversation.html#training-on-last-message">train on last doc</a>.</p></li>
<li><p>Adjust your dataset to only have <code>thinking</code> content in the last turn.</p></li>
</ul>
</section>
<section id="tips" class="level3">
<h3 class="anchored" data-anchor-id="tips">TIPS</h3>
<ul>
<li>Read more on how to load your own dataset at <a href="https://docs.axolotl.ai/docs/dataset_loading.html">docs</a>.</li>
<li>The dataset format follows the OpenAI Messages format as seen <a href="https://docs.axolotl.ai/docs/dataset-formats/conversation.html#chat_template">here</a>.</li>
</ul>
</section>
</section>
<section id="optimization-guides" class="level2">
<h2 class="anchored" data-anchor-id="optimization-guides">Optimization Guides</h2>
<ul>
<li><a href="https://docs.axolotl.ai/docs/multi-gpu.html">Multi-GPU Training</a></li>
<li><a href="https://docs.axolotl.ai/docs/multi-node.html">Multi-Node Training</a></li>
</ul>
</section>
<section id="related-resources" class="level2">
<h2 class="anchored" data-anchor-id="related-resources">Related Resources</h2>
<ul>
<li><a href="https://openai.com/index/introducing-gpt-oss/">GPT-OSS Blog</a></li>
<li><a href="https://docs.axolotl.ai">Axolotl Docs</a></li>
<li><a href="https://axolotl.ai">Axolotl Website</a></li>
<li><a href="https://github.com/axolotl-ai-cloud/axolotl">Axolotl GitHub</a></li>
<li><a href="https://discord.gg/7m9sfhzaf3">Axolotl Discord</a></li>
</ul>
</section>
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