Moderate1M contextOpenAI

OpenAI: GPT-5.4

OpenAI: GPT-5.4 is the practical "default smart model" for people who want one system for coding, document analysis, tool use, and general chat. Its pricing sits in the moderate tier, but actual usage is often cheaper than people expect: 100 short chats cost about $0.57, a long PDF plus questions is $0.28, and a 50-step agent workflow is around $0.50. The non-obvious part: with a 1M-token context, it can replace several niche tools you may be paying for separately.

Best for

  • Reading very large documents and then answering detailed follow-up questions without forcing you to split files manually.
  • Coding workflows where you want one model for planning, writing, and iterating instead of juggling separate chat and code assistants.
  • Agent-style work that needs tool use and structured output at a cost that stays reasonable for repeated runs.

Not ideal for

  • Ultra-cheap high-volume generation where output token cost matters more than model breadth.
  • People who only need a simple chatbot and are not using long context, tools, or coding features.

What it costs in real life

Computed from OpenRouter API pricing ($2.50 input / $15.00 output per 1M tokens)

100 short chats(50K in / 30K out)
$0.57Cheap
1 long PDF + questions(80K in / 5K out)
$0.28Cheap
1,000 coding completions(200K in / 400K out)
$6.50Moderate
Agent workflow (50 steps)(50K in / 25K out)
$0.50Cheap

Frequently Asked Questions

Is OpenAI: GPT-5.4 worth it if I already pay for ChatGPT or Cursor?

Often, no extra purchase is needed. GPT-5.4 shows up inside subscriptions like ChatGPT Plus, ChatGPT Business, Cursor Pro, Perplexity Pro, Notion AI, and several others, so the real question is whether you're already paying for the same underlying model in multiple places.

How expensive is OpenAI: GPT-5.4 for normal work?

Less expensive than many people assume. The pre-computed examples are modest: 100 short chats cost about $0.57, one long PDF plus questions is $0.28, and a 50-step agent workflow is around $0.50, though output-heavy workloads will climb faster because output is priced at $15.00 per 1M tokens.

What should I use OpenAI: GPT-5.4 for instead of a smaller model?

Use it when the job is messy, multi-step, or large in scope: big documents, coding sessions, tool-driven workflows, and tasks where structured output matters. If your work is mostly short prompts and disposable text generation, you're paying for capabilities you probably won't use.

Capabilities

Vision
Tool calling
Structured output
Reasoning
Open weights
Long context

Cheapest access path

If you already have a subscription like ChatGPT Go, Notion AI, Perplexity Pro, or Cursor Pro, you may already have access without buying anything else. For direct API usage, the cost is often lower than expected: a long PDF plus Q&A is about $0.28, and even 1,000 coding completions come to roughly $6.50 according to StackTrim AI.

long-contextcodingvisiontool-usestructured-outputmoderate-costgeneralist