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openai/gpt-5.4
OpenAI's most capable frontier model for complex professional work, coding, and multi-step reasoning.
Capabilities
Cost
Community model (estimated from hardware time)
Input Parameters
| Name | Type | Description | Default | Constraints |
|---|---|---|---|---|
image_input | array | List of images to send to the model | | — |
max_completion_tokens | integer | Maximum number of completion tokens to generate. For higher reasoning efforts you may need to increase your max_completion_tokens to avoid empty responses (where all the tokens are used on reasoning). | — | — |
messages | array | A JSON string representing a list of messages. For example: [{"role": "user", "content": "Hello, how are you?"}]. If provided, prompt and system_prompt are ignored. | | — |
prompt | string | The prompt to send to the model. Do not use if using messages. | — | — |
reasoning_effort | string | Constrains effort on reasoning for GPT-5.4. Supported values are none, low, medium, high, and xhigh. The default none provides fast, low-latency responses similar to GPT-4.1 in speed. Higher reasoning efforts produce more thorough answers but use more tokens and take longer. For higher reasoning efforts you may need to increase your max_completion_tokens to avoid empty responses (where all the tokens are used on reasoning). | "none" | none low medium high xhigh |
system_prompt | string | System prompt to set the assistant's behavior | — | — |
verbosity | string | Constrains the verbosity of the model's response. Lower values will result in more concise responses, while higher values will result in more verbose responses. Currently supported values are low, medium, and high. GPT-5 supports this parameter to help control whether answers are short and to the point or long and comprehensive. | "medium" | low medium high |
image_input array List of images to send to the model
max_completion_tokens integer Maximum number of completion tokens to generate. For higher reasoning efforts you may need to increase your max_completion_tokens to avoid empty responses (where all the tokens are used on reasoning).
messages array A JSON string representing a list of messages. For example: [{"role": "user", "content": "Hello, how are you?"}]. If provided, prompt and system_prompt are ignored.
prompt string The prompt to send to the model. Do not use if using messages.
reasoning_effort string Constrains effort on reasoning for GPT-5.4. Supported values are none, low, medium, high, and xhigh. The default none provides fast, low-latency responses similar to GPT-4.1 in speed. Higher reasoning efforts produce more thorough answers but use more tokens and take longer. For higher reasoning efforts you may need to increase your max_completion_tokens to avoid empty responses (where all the tokens are used on reasoning).
"none" system_prompt string System prompt to set the assistant's behavior
verbosity string Constrains the verbosity of the model's response. Lower values will result in more concise responses, while higher values will result in more verbose responses. Currently supported values are low, medium, and high. GPT-5 supports this parameter to help control whether answers are short and to the point or long and comprehensive.
"medium" 93f5c5874511 Updated: 6/26/2026 95.9K runs