AllenAI: Olmo 3.1 32B Think

allenai/olmo-3.1-32b-think

Released Dec 16, 202565,536 context

$0.15/M input tokens$0.50/M output tokens

Olmo 3.1 32B Think is a large-scale, 32-billion-parameter model designed for deep reasoning, complex multi-step logic, and advanced instruction following. Building on the Olmo 3 series, version 3.1 delivers refined reasoning behavior and stronger performance across demanding evaluations and nuanced conversational tasks. Developed by Ai2 under the Apache 2.0 license, Olmo 3.1 32B Think continues the Olmo initiative’s commitment to openness, providing full transparency across model weights, code, and training methodology.

Providers for Olmo 3.1 32B Think

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Olmo 3.1 32B Think

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Effective Pricing for Olmo 3.1 32B Think

Actual cost per million tokens across providers over the past hour

Apps using Olmo 3.1 32B Think

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Recent activity on Olmo 3.1 32B Think

Total usage per day on OpenRouter

Reasoning

1.78M

Prompt

1.5M

Completion

-42,700

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for Olmo 3.1 32B Think

Uptime stats for Olmo 3.1 32B Think across all providers

Sample code and API for Olmo 3.1 32B Think

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

Olmo 3.1 32B Think - API Pricing & Providers | OpenRouter