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OpenAI GPT-5.4: AI Large Language Models

GPT-5.4 delivers powerful reasoning, coding, and professional knowledge work. Supports multimodal inputs (text and image) with adjustable reasoning depth. Token-based pricing: $1.25/M input tokens, $9.00/M output tokens. Two endpoints: standard async (/gpt-5-4) and live streaming (/gpt-5-4/stream) via SSE.

Interactive model controls

GPT-5.4 delivers powerful reasoning, coding, and professional knowledge work. Supports multimodal inputs (text and image) with adjustable reasoning depth. Token-based pricing: $1.25/M input tokens, $9.00/M output tokens. Two endpoints: standard async (/gpt-5-4) and live streaming (/gpt-5-4/stream) via SSE.

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Overview

About this model

GPT-5.4 is OpenAI's latest flagship model delivering powerful reasoning, coding, and professional knowledge work. Supports multimodal inputs (text and image) and adjustable reasoning depth. Token-based pricing: $1.25 per million input tokens and $9.00 per million output tokens — well below official OpenAI pricing.

1Professional Reasoning: Complex analysis, research synthesis, and high-stakes decision support.
2Coding & Engineering: Generate, review, and debug code with strong contextual understanding.
3Multimodal Tasks: Analyze images combined with text prompts for richer responses.
4Automation Pipelines: Classification, summarization, extraction, and routing in backend workflows.
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Pricing & Value

Cost analysis

muapiapp$1.25/M input tokens, $9.00/M output tokens

Token-based billing. Minimum $0.00023 per call. ~71% of official input pricing, ~64% of official output pricing. Supports Prompt Caching (0.1x for hits, 1.25x for creation).

OpenAI (official)~$1.75/M input tokens, ~$14.00/M output tokens

Official pricing via api.openai.com.

Fal.aiNot available

GPT-5.4 is not available on Fal.ai.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

The user message or instruction.

Default ValueWrite a Python function to parse nested JSON with error handling.
Image URLstring

Optional image URL for multimodal requests.

Default Valueundefined
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Implementation Guide

Developer documentation

Standard (Async)

POST /api/v1/gpt-5-4 — returns request_id, poll for result via /api/v1/predictions/{id}/result.

Streaming (SSE)

POST /api/v1/gpt-5-4/stream — returns a live SSE stream. Each chunk: data: {"choices":[{"delta":{"content":"text"}}]}, ending with data: [DONE].

See Streaming Documentation for full code examples.

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Common Questions

Frequently asked

How is pricing calculated?

Pricing is token-based: $1.25 per million input tokens and $9.00 per million output tokens. The minimum charge per call is $0.00023. Actual cost is deducted after each call based on token counts returned by the model.

What is the difference between /gpt-5-4 and /gpt-5-4/stream?

/gpt-5-4 is async — you receive a request_id and poll for the result. /gpt-5-4/stream returns a live SSE stream. Use streaming for chat UIs; use the async endpoint for workflows and automation.

Does GPT-5.4 support images?

Yes. Pass an image_url in the request body to include an image as multimodal input alongside your text prompt.

Does this model support Prompt Caching?

Yes. Prompt Caching allows you to reuse frequently used text prompts at reduced rates. Cache hits (reusing previously cached tokens) are charged at 0.1x of the input cost. New cache creation (writing new tokens to cache for future reuse) is charged at 1.25x of the standard input cost.