How much does o3 cost?

o3 is listed at $2/1M input tokens, $0.5/1M cached input tokens, and $8/1M output tokens.

What is the context window for o3?

o3 supports a context window of 200k tokens in Sim. In an agent, this determines how much conversation history, tool outputs, and retrieved documents the model can hold in a single call.

What capabilities does o3 support?

o3 supports the following capabilities in Sim: Tool choice, Structured outputs, Reasoning low, medium, high, Max output 100k.

What is o3 best used for?

Best for reasoning-heavy tasks that need more deliberate model control. When used in a Sim workflow, it can be selected in any Agent block from the model picker.

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OpenAI model

o3

Name: o3
Brand: OpenAI
SKU: o3

o3 is a OpenAI model tracked in Sim. It supports a 200k token context window. Pricing starts at $2/1M input tokens and $8/1M output tokens. Key capabilities include Tool choice, Structured outputs, Reasoning low, medium, high. Best for reasoning-heavy tasks that need more deliberate model control.

Build with this model All OpenAI models

Input price$2/1M

Cached input$0.5/1M

Output price$8/1M

Context window200k

Max output100k tokens

ProviderOpenAI

UpdatedApr 1, 2026

Best forBest for reasoning-heavy tasks that need more deliberate model control.

TemperatureNot configurable

Reasoning effortlow, medium, high

VerbosityNot supported

Thinking levelsNot supported

Structured outputsSupported

Tool choiceSupported

Computer useNot supported

Deep researchNot supported

Memory supportSupported

Max output tokens100k

Frequently asked questions

o3 is a OpenAI model available in Sim. o3 is a OpenAI model tracked in Sim. It supports a 200k token context window. Pricing starts at $2/1M input tokens and $8/1M output tokens. Key capabilities include Tool choice, Structured outputs, Reasoning low, medium, high.