Lernex/Metis-1.3-think

Metis-1.3 Think

Metis-1.3 Think is the reasoning-tuned variant of the 201M-parameter Metis-1.3 family. It starts from the chat-tuned model and applies an additional reasoning-focused supervised fine-tuning stage.

Model summary

• Family: Metis
• Stage: Reasoning SFT
• Parameters: 201,490,560
• Architecture: Mamba2-attention hybrid decoder
• Context length: 4096
• Vocabulary size: 8192
• Dtype: bfloat16 weights

What changed from chat

This release starts from Metis-1.3 Chat and adds a reasoning-focused SFT stage aimed at improving:

• step-by-step problem solving
• structured answers
• deliberate response style on reasoning-heavy prompts

Intended use

This is the most reasoning-oriented checkpoint in the Metis-1.3 line and is the best candidate for:

• small-model reasoning experiments
• side-by-side evals against the base and chat models
• testing whether extra reasoning-oriented post-training helps downstream behavior

Limitations

• This is still a small model and can fail on complex reasoning, factuality, and long-horizon consistency.
• The reasoning SFT dataset in this run saturated very quickly, so this release should be treated as an early reasoning-tuned checkpoint rather than a fully mature post-training result.
• English is the intended primary language.

Recommended variants

• Use Metis-1.3 Base for raw pretrained behavior.
• Use Metis-1.3 Chat for the more balanced conversational variant.
• Use Metis-1.3 Think when you specifically want the reasoning-tuned release.

Files

• model.safetensors
• config.json
• generation_config.json
• tokenizer.json
• tokenizer_config.json
• special_tokens_map.json

License

This release inherits the licensing and attribution obligations of the upstream training and post-training data sources used in the Metis pipeline. Review dataset licenses and usage constraints before production use.