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ReasoningTool callingLong context

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Setup

To get started, sign into Baseten with Truss and then install the OpenAI SDK.
Sign in to Baseten
uvx truss login --browser
Install the OpenAI SDK
uv pip install openai
Qwen/Qwen3-235B-A22B-Instruct-2507-FP8 is a 235B-parameter MoE model (22B active per token) with up to 256K context. This preset serves Qwen3-235B FP8 on H100:8 with TensorRT-LLM, optimized for low time-to-first-token on single-request reasoning at this scale.

Hardware

H100 × 8

Engine

TRT-LLM v2

Context

256K

Concurrency

256

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Write the config

Create and move into the project directory: 
mkdir qwen3-235b-latency && cd qwen3-235b-latency
Then create a file named config.yaml and paste the following:
config.yaml
model_metadata:
  example_model_input: # Loads sample request into Baseten playground
    messages:
      - role: system
        content: "You are a helpful assistant."
      - role: user
        content: "What does Tongyi Qianwen mean?"
    stream: false
    model: "Qwen/Qwen3-235B-A22B-Instruct-2507-FP8"
    max_tokens: 512
    temperature: 0.6
  tags:
    - openai-compatible
  repo_id: Qwen/Qwen3-235B-A22B-Instruct-2507-FP8
model_name: "model:qwen3-235b preset:latency"
weights:
  - source: "hf://Qwen/Qwen3-235B-A22B-Instruct-2507-FP8@main"
    mount_location: "/app/model_cache/trt_model"
resources:
  accelerator: H100:8
  cpu: "1"
  memory: 10Gi
  use_gpu: true
trt_llm:
  build:
    checkpoint_repository:
      repo: michaelfeil/empty-model
      revision: main
      source: HF
  inference_stack: v2
  runtime:
    enable_chunked_prefill: true
    max_batch_size: 256
    max_num_tokens: 8192
    max_seq_len: 262144
    served_model_name: Qwen/Qwen3-235B-A22B-Instruct-2507-FP8
    tensor_parallel_size: 8
    patch_kwargs:
      disable_overlap_scheduler: True
      model_path: /app/model_cache/trt_model
      moe_expert_parallel_size: 8
      cuda_graph_config:
        enable_padding: true
        max_batch_size: 256
      enable_autotune: false
      guided_decoding_backend: "xgrammar"
      enable_iter_perf_stats: 0
      kv_cache_config:
        enable_block_reuse: true
        free_gpu_memory_fraction: 0.8
  version_overrides:
    v2_llm_version: null

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Key parameters

Baseten Inference Stack (BIS) reads these fields from the trt_llm block. Each one shapes how the engine is built and served:
ParameterValue
Tensor parallel size8
Max sequence length262144
Max batch size256
Max batched tokens8192
Chunked prefillenabled
Inference stackv2
Served model nameQwen/Qwen3-235B-A22B-Instruct-2507-FP8

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Deploy

Push the config to Baseten: 
uvx truss push
You should see output similar to: 
✨ Model qwen3-235b-latency was successfully pushed ✨
🪵 View logs for your deployment at https://app.baseten.co/models/abcd1234/logs/wxyz5678
Your model ID is the string after /models/ in the logs URL (abcd1234 in the example). Use it wherever you see {model_id} in the next section.

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Call the model

Your deployment serves an OpenAI-compatible API. Replace {model_id} with your model ID and make sure BASETEN_API_KEY is set. Now call your deployment to run inference:
main.py
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["BASETEN_API_KEY"],
    base_url="https://model-{model_id}.api.baseten.co/environments/production/sync/v1",
)

response = client.chat.completions.create(
    model="Qwen/Qwen3-235B-A22B-Instruct-2507-FP8",
    messages=[
        {"role": "user", "content": "What is machine learning?"}
    ],
)

print(response.choices[0].message.content)