Sources & verification notes

Qwen3.5-4B-Base

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• First availability

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Not verified. These sources establish the identifier, not this missing fact.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Availability status

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Repository is listed in the Qwen organization on Hugging Face and the card was readable on the observation date.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Image input follows the Hugging Face pipeline tag and the card type; tool and structured-output support were not verified. Context from the "Context Length" line of the model card ("Context Length: 262,144 natively and extensible up to 1,010,000 tokens."). Review 2026-10-01: The pre-trained-only card (intended for fine-tuning, "not direct interaction") documents no tool calling, structured output or maximum generation length.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Input price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Downloadable weights.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Output price

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Downloadable weights.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Model card

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  Parameter and architecture fields are copied from the model card text; fields the card does not state are left empty.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• Provider description

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026

• License

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • Qwen/Qwen3.5-4B-Base model card (Hugging Face) ↗Qwen · provider-authored · checked Oct 1, 2026