OpenAI: GPT-5-Chat
GPT-5-Chat is a language model from OpenAI released on Sep 30, 2024. It reads text and images and writes text, with a 128K token context window and up to 16K tokens per reply.
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It costs $1.10 per million input tokens and $9 per million output tokens. Cached input bills at $0.11, 90% less than fresh input.
It supports tool calling and prompt caching.
5 providers serve it, including Poe, Jiekou.AI and Helicone.
- Modalities
- In / out price
- $1.10 / $9 per 1M
- Context
- 128K
- Max output
- 16K
- Released
- Sep 30, 2024
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-5-Chat 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 | $1.10 / 1M tokens | |
|---|---|---|
| Output | $9 / 1M tokens | |
| Cached input (read) | $0.11 / 1M tokens | 90% off input |
GPT-5-Chat providers
5 providers serve it, including Poe, Jiekou.AI and Helicone. 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 |
|---|---|---|---|---|---|
| Poe | $1.10 | $9 | $0.11 | 128K | 16K |
| Jiekou.AI | $1.13 | $9 | – | 400K | 128K |
| Helicone | $1.25 | $10 | $0.125 | 128K | 16K |
| Merge Gateway | $1.25 | $10 | $0.125 | 128K | 16K |
| OrcaRouter | $1.25 | $10 | $0.125 | 400K | 100K |
What GPT-5-Chat 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-Chat through an OpenAI compatible API.
- Tools
tools
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GPT-5-Chat questions
How much does the GPT-5-Chat API cost?
$1.10 per million input tokens and $9 per million output tokens, with cached input at $0.11. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of GPT-5-Chat?
128,000 tokens of input, and it can write up to 16,384 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve GPT-5-Chat?
5 providers serve it, including Poe, Jiekou.AI and Helicone. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does GPT-5-Chat support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is GPT-5-Chat open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was GPT-5-Chat released?
Sep 30, 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-Chat?
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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