OpenAI: GPT-5 Pro
GPT-5 Pro is a reasoning model from OpenAI released on Jan 1, 2025. It reads text and images and writes text, with a 400K token context window and up to 272K tokens per reply.
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It costs $15 per million input tokens and $120 per million output tokens.
It supports tool calling and structured JSON output.
16 providers serve it, including Azure, Vercel AI Gateway and Jiekou.AI. The lowest input price is $13.50 per million tokens at Jiekou.AI.
- Modalities
- In / out price
- $15 / $120 per 1M
- Context
- 400K
- Max output
- 272K
- Released
- Jan 1, 2025
- Knowledge cutoff
- Sep 2024
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-5 Pro pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $15 / 1M tokens | |
|---|---|---|
| Output | $120 / 1M tokens |
GPT-5 Pro providers
16 providers serve it, including Azure, Vercel AI Gateway and Jiekou.AI. The lowest input price is $13.50 per million tokens at Jiekou.AI. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| OpenAI First party | $15 | $120 | – | 400K | 272K |
| Azure | $15 | $120 | – | 400K | 128K |
| Vercel AI Gateway | $15 | $120 | – | 400K | 272K |
| Jiekou.AI | $13.50 | $108 | – | 400K | 272K |
| Poe | $14 | $110 | – | 400K | 128K |
| 302.AI | $15 | $120 | – | 400K | 272K |
| Azure Cognitive Services | $15 | $120 | – | 400K | 128K |
| DevPass (LLM Gateway) | $15 | $120 | – | 400K | 272K |
| Eden AI | $15 | $120 | – | 400K | 272K |
| Helicone | $15 | $120 | – | 128K | 33K |
| Impossibl | $15 | $120 | – | 400K | 272K |
| Kilo Gateway | $15 | $120 | – | 400K | 128K |
Showing 12 of 16 providers: the lab first, then the major clouds, then the cheapest resellers.
What GPT-5 Pro costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call GPT-5 Pro through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
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GPT-5 Pro questions
How much does the GPT-5 Pro API cost?
$15 per million input tokens and $120 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of GPT-5 Pro?
400,000 tokens of input, and it can write up to 272,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve GPT-5 Pro?
16 providers serve it, including Azure, Vercel AI Gateway and Jiekou.AI. The lowest input price is $13.50 per million tokens at Jiekou.AI. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does GPT-5 Pro support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is GPT-5 Pro open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was GPT-5 Pro released?
Jan 1, 2025, with training data up to Sep 2024.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on GPT-5 Pro?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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