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AllenAI: Olmo 3.1 32B Think (free)

Allen AI
Vision
66K
Context
Free
Input /1M
Free
Output /1M
N/A
Max Output
Run API Call Open in Chat

AllenAI: Olmo 3.1 32B Think (free)

Description

This is a 32-billion parameter model emphasizing reasoning capabilities. The system excels at deep reasoning, complex multi-step logic, and advanced instruction following. Version 3.1 represents improvements over earlier iterations with refined reasoning behavior and stronger performance across demanding evaluations.

The model is designed for complex problem-solving requiring explicit reasoning chains before final responses. All responses include internal thinking between <think> tags (mandatory reasoning mode).

Technical Specifications

Specification Value
Context Window 65,536 tokens
Context Length 65,536 tokens
Input Modalities Text only
Output Modalities Text only
Quantization BF16
Parameters 32 billion

Pricing

Type Price
Input $0 per 1M tokens
Output $0 per 1M tokens

Note: This model is completely free to use.

Supported Parameters

Generation Parameters

  • Temperature
  • Top-P
  • Top-K
  • Min-P
  • Seed
  • Stop sequences

Penalty Parameters

  • Frequency Penalty
  • Presence Penalty
  • Repetition Penalty

Advanced Features

  • Logit bias
  • Structured outputs
  • Response formatting
  • Reasoning (mandatory)

Tool Support

  • Tool choice support: none, auto, required
  • Function calling capabilities enabled
  • Multipart support enabled

Use Cases

  • Complex mathematical problem solving
  • Multi-step logical reasoning
  • Code analysis and debugging
  • Detailed explanations and tutorials
  • Research and analysis tasks
  • Tasks requiring transparent decision-making processes

Key Features

Mandatory Reasoning

All responses include internal thinking between <think> tags. This reasoning chain is visible in the output and allows users to understand the model's thought process before receiving the final answer.

Tool/Function Calling

Full support for tool and function calling capabilities, enabling integration with external systems and APIs.

Open Source

Licensed under Apache 2.0, allowing for commercial use, modification, and distribution.

Limitations

  • Text-only input and output (no image/audio support)
  • Rate limited to 50 requests per minute on free tier
  • All responses include reasoning overhead (increased token usage)

API Usage Example

curl https://api.langmart.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $LANGMART_API_KEY" \
  -d '{
    "model": "allenai/olmo-3.1-32b-think:free",
    "messages": [
      {
        "role": "user",
        "content": "Solve this step by step: What is 15% of 240?"
      }
    ]
  }'
  • allenai/olmo-3.1-32b - Base version without mandatory reasoning
  • Other reasoning-focused models on LangMart

Basic Information

Property Value
Model ID allenai/olmo-3.1-32b-think:free
Full Name AllenAI: Olmo 3.1 32B Think (free)
Author AllenAI
Created December 16, 2025
License Apache 2.0

Provider Details

Property Value
Primary Provider Parasail
Provider Model ID parasail-olmo-31-32b-think
Rate Limits 50 requests per minute
Data Policy No training usage; no prompt retention

Usage Statistics (December 23, 2025)

Metric Value
Total Requests 9,840
Prompt Tokens 119.9M
Reasoning Tokens 23.1M
Completion Tokens 23.1M

Response Format

The model returns responses with reasoning wrapped in <think> tags:

<think>
To find 15% of 240, I need to:
1. Convert 15% to a decimal: 15/100 = 0.15
2. Multiply 240 by 0.15
3. 240 * 0.15 = 36
</think>

15% of 240 is 36.

Source