WitchLM-1.5B: access, sources and model facts

Publisher-sourced inventory. Specifications come from official documentation and model cards. “Not documented” means we have no verified value. This inventory is separate from our editorial reviews.

Coverage & sources ↗

Current catalog answers

What to know about WitchLM-1.5B

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

Which WitchLM-1.5B does this page describe?

WitchLM-1.5B is a model record from Arcee AI in the WitchLM family. Source

A separate version identifier is not documented in this record; the model name alone does not establish which snapshot a service runs.

How can you access WitchLM-1.5B?

The catalog documents Open weights access for WitchLM-1.5B. Source

As of the catalog check, this version was listed without confirmed general availability. Source

Open weights means the model weights are distributed for use under their stated terms. It does not establish a hosted API, an open-source license, or a hardware requirement.

What license is recorded for WitchLM-1.5B?

The recorded license label is apache-2.0. Source

Read the linked license and associated use terms for this exact version before redistribution, commercial deployment or fine-tuning. A label alone does not establish every permission, restriction or obligation, and it does not determine the terms of a separate hosted service.

What distinguishes WitchLM-1.5B?

These details come from the linked publisher material for this model. Reported capabilities and training descriptions are publisher statements, not independent test results.

Base checkpoint: Fine-tuned from Qwen2 1.5B; no capability, context or cutoff inherited. Source
Published training recipe: Trainer metadata reports five epochs, Adam optimization and a cosine learning-rate schedule. This is training metadata, not evidence of a context limit. Source
Recorded software versions: The generated training card records Transformers 4.44.0, PyTorch 2.3.1 with CUDA 12.1, Datasets 2.20.0 and Tokenizers 0.19.1. Source

What is documented about the WitchLM-1.5B checkpoint?

This evidence refers to arcee-ai/WitchLM-1.5B at recorded revision 1b7b514b4043c209cde8dc2910a349b238d892b5, checked October 23, 2026. Repository metadata

Safetensors metadata records 1,543,714,304 stored parameters. This is a stored-weight count, not necessarily the number activated per token, a download size or a GPU-memory requirement. Repository metadata

Recorded architecture class: Qwen2ForCausalLM. Repository metadata

Repository access gate: false. This records the repository's gate setting when checked; licensing and use terms still apply. Repository metadata

What the configuration file says

The pinned config.json contains these values. Pinned configuration

max_position_embeddings: 131,072
torch_dtype: bfloat16
num_attention_heads: 12
num_key_value_heads: 2
num_hidden_layers: 28
hidden_size: 1,536

Configuration values describe the checkpoint and its implementation. In particular, max_position_embeddings, sliding_window and rope_scaling do not independently establish an API context limit, tested usable length or hardware requirement. Runtime, quantization, cache, batch size and input length affect deployment behavior.

Read the retrieved model card for setup and qualifications. Model card

The documented record

Specifications, with their sources.

A missing value remains unknown. Input limits, output limits and the total context window are separate measurements.

Publisher: Arcee AISource ↗
Family: WitchLMSource ↗
Version: Not documented
Availability: Listed by publisherSource ↗
Access: Open weightsSource ↗
Inputs: Not documented
Outputs: Not documented
Context window: Not documented
Maximum input: Not documented
Maximum output: Not documented
Knowledge cutoff: Not documented
Training-data cutoff: Not documented
Training completed: Not documented
Release date: Not documented
License: apache-2.0Source ↗
Input price / 1M tokens: Not documented
Output price / 1M tokens: Not documented

Read this with the numbers.

Official publisher model repository; listed status confirms a catalog entry, not a verified hosted API service. Publisher repository evidence (2026-10-23): Published architecture metadata: Qwen2ForCausalLM. Published safetensors metadata counts 1,543,714,304 stored parameters; this is not an active-parameter count for mixture-of-experts models. Published configuration: max_position_embeddings=131072; dtype=bfloat16; 28 hidden layers. Checkpoint configuration is not a verified hosted serving limit; context and output limits remain separate documented fields.

Model identifiers and aliases 1

arcee-ai/WitchLM-1.5B

Follow the evidence

Official sources.

WitchLM-1.5B — official model card ↗huggingface.co
WitchLM-1.5B: official publisher repository metadata ↗huggingface.co
WitchLM-1.5B: publisher model card at pinned revision ↗huggingface.co
WitchLM-1.5B: published checkpoint configuration at revision 1b7b514b4043 ↗huggingface.co

From the Headless Thrones newsroom

Editorial about WitchLM-1.5B

No published articles are linked to this exact model yet. New coverage will appear here as it is published.

Your starting point

WitchLM-1.5B

Arcee AI · Open weights

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Inputs: Not documented
Outputs: Not documented
Context window: Not documented
Knowledge cutoff: Not documented

A place to begin comparing

0 models to consider.

Matches must share an access route, support every documented input type of your starting model, and return text. When both publish a context limit in the same field, the candidate must fall between half and twice that limit. Unknown or differently defined limits remain as broader matches, after verified near-context matches. Within each group, recent documented releases appear first. These criteria do not establish equal quality. The full current inventory is considered.

No candidate meets the documented access, input/output and context criteria. You can still choose models manually in the comparison tool.

A record you can follow

The source belongs beside the fact.

Official sources

Model records cite the developer’s documentation, release notes and model cards. A listing alone is not a tested service or a recommendation.

Dates mean different things

Knowledge cutoff, training-data cutoff, training completion and release date are separate fields. A model’s name or repository upload date does not establish any of them.

Limits need context

Some publishers use rounded K/M token figures. Deployment, reasoning settings and regional access can change usable limits. Read the source before choosing.

Coverage and last check

Independent editorial model library assembled from primary vendor documentation and official publisher model cards. This is a dated, auditable inventory of the sources reviewed, not a claim to every model worldwide. First-party language-model inventory for OpenAI, Anthropic, Google Gemini/Gemma, xAI, Meta and Reflection. Includes vendor-listed legacy/retired identities with explicit statuses; official pretrained and instruction-tuned checkpoints remain distinct. Excludes embeddings, moderation/guard models, image/audio/video-only generation, community fine-tunes, speculative draft helpers, format/runtime/quantization duplicates, and PaliGemma dataset-specific benchmark fine-tunes. Availability means documented vendor API or downloadable official weights, not guaranteed account eligibility. Unknown specifications and dates remain null. Rounded K/M limits preserve vendor granularity; exact integers are used only where documented. No OpenRouter facts are used. Primary-source inventory of language-capable models from Alibaba/Qwen, DeepSeek, Moonshot, MiniMax, Z.ai, ByteDance Seed, Tencent, Baidu, Xiaomi, StepFun, 01.AI, Shanghai AI Laboratory, Baichuan and OpenBMB. Includes full reachable official public weight inventories plus documented hosted API models and explicit retirements. Embeddings, reward/classifier/router/tokenizer/draft-head components, standalone OCR/document converters and image/video/audio-only generators are excluded; multimodal language models retained. Official packaging variants are folded into aliases where a canonical listing was identifiable; remaining research/base/SFT variants retain exact identities. Not a guarantee every historical/private/regional model is available. Unknown specifications remain null; K/M API display quantities use decimal normalization where explicitly noted, rather than implying verified exact serving ceilings. Model-name dates and repository creation timestamps are never used as release/training dates. Open weights does not mean unrestricted or OSI-open-source licensing. Some model-card bodies were unreachable; their public inventory metadata is retained and disclosed. Official Mistral, Cohere, AI21, NVIDIA Nemotron, Microsoft Phi/MAI, Amazon Nova, IBM Granite, AllenAI OLMo/Molmo, TII Falcon, Nous Research, Arcee and Essential AI model inventory checked 2026-10-23. Includes base, instruction, reasoning, coding and text-producing multimodal models, including legacy API versions. Excludes embeddings/rerankers/reward and safety classifiers, image/audio/video-only generation, robotics-only models, duplicate quantization/runtime packages, adapters, intermediate checkpoint experiments, and third-party mirrors. Arcee coverage focuses on its named product families rather than exploratory merge repositories. Repository listing means listed, not independently verified API availability. K/M figures are nominal decimal normalizations when the source supplies shorthand; deployment-specific exact token limits may differ. Unverified values remain null. This is a source-backed inventory, not a complete claim-level independent editorial review. Supplemental official Liquid AI, Reka and Inception generative language catalog. Excludes media-only generators and decision/classification-only models. No assumed training dates.

Catalog edition updated Oct 23, 2026. Source links are provided on each model record.

View the full coverage report and discovery sources ↗