Catalogue / OpenRouter / OpenAI: GPT-5.1-Codex-Mini (sold by OpenRouter)

OpenAI: GPT-5.1-Codex-Mini (sold by OpenRouter)

Name: GPT-5.1-Codex-Mini pricing and limits on OpenRouter
Creator: Bertrande
License: https://creativecommons.org/licenses/by/4.0/

Prices and limits, each value carrying the date it was observed and the source it came from.

As of 15 September 2026, GPT-5.1-Codex-Mini costs $0.250 per million input tokens and $2.00 per million output tokens on OpenRouter. Observed on OpenRouter's own published price list on 15 September 2026. This is OpenRouter's resale price, not the model vendor's list price.

Input $0.250 per 1M

Output $2.00 per 1M

Context 400 000 tokens

Lifecycle notice. A third-party registry reports a deprecation date of 2026-07-23 for the underlying model. That source is level 5, so we publish it as a signal, not as a verified fact. See how we rank sources.

What does GPT-5.1-Codex-Mini cost?

Parameter	Value	Unit	Observed	Source	Proof
Input price	$0.250	USD per 1M tokens	15 September 2026 checked 18 September 2026	official API L1	`08c6e27b7535`
Output price	$2.00	USD per 1M tokens	15 September 2026 checked 18 September 2026	official API L1	`08c6e27b7535`
Context window	400 000	tokens	15 September 2026 checked 18 September 2026	official API L1	`08c6e27b7535`
Maximum output	128 000	tokens	15 September 2026 checked 18 September 2026	official API L1	`08c6e27b7535`
Input modalities	image text	list	18 September 2026 checked 18 September 2026	official API L1	`62c152853524`
Output modalities	text	list	18 September 2026 checked 18 September 2026	official API L1	`62c152853524`
Cache read price	$0.030	USD per 1M tokens	15 September 2026 checked 18 September 2026	official API L1	`08c6e27b7535`
Listed since	2025-11-13	date	18 September 2026 checked 18 September 2026	official API L1	`62c152853524`
Supported parameters	include_reasoning max_completion_tokens reasoning reasoning_effort response_format seed structured_outputs tool_choice tools	list	18 September 2026 checked 18 September 2026	official API L1	`62c152853524`

How reliable is each host behind GPT-5.1-Codex-Mini?

The cheapest offer is not a bargain if it is down. OpenRouter routes traffic to several upstream hosts for this model and publishes the availability its own router recorded over the last day for each of them. Least reliable first.

Host	Availability, last day	Observed
azure	100.00 %	17 September 2026

This is availability as OpenRouter's router observed it, not as you would measure it calling the host directly: the network path is not the same. We read it once a day and keep every reading, so a host that was unreliable last August can still be shown to have been unreliable last August.

We publish no time to first token and no throughput. OpenRouter's API carries fields for both and leaves them empty on every endpoint we have read, and we will not fill a number the source does not give.

How has GPT-5.1-Codex-Mini moved?

Output price, 4 observations between 25 August 2026 and 15 September 2026. Range $2.00 to $2.00. Drawn as a step: a value holds until the next observation, we do not interpolate between them.

Has GPT-5.1-Codex-Mini changed price?

No change has been recorded since we started observing this service on 25 August 2026. We record a change only when two successive observations differ, so an empty table here means the values have held.

Other services from OpenRouter

All OpenRouter services

Where these figures come from

Source: OpenRouter. Every figure on this page was read from OpenRouter's own published price list, and every row above links straight back to it. We publish factual values with attribution, we do not reproduce OpenRouter's content, and we send readers to them. If you publish this source and want us to stop tracking it, write to contact@bertrande.com and we will act on it without argument.

How is this page verified?

Every figure above comes from OpenRouter's own published price list, which we rank as a level 1 source. We re-check it every 6 hours. Each observation stores the exact source URL and a SHA-256 fingerprint of the source content at that moment, which is what lets us prove what the source said on a given day.

The Proof column shows the first twelve characters of the SHA-256 fingerprint of the source content at the moment we read it. Hover it for the full value. It is what lets us demonstrate later what the source said on a given day, after that page has changed or vanished. The full fingerprints are in data.json.

No value on this page was produced, estimated or completed by a language model. Where we do not have a verified figure, the row is absent rather than filled in. Read the full methodology, or report an error.

Take the data, or watch this page

This page is available as data.json (including the full observation history of every parameter) and data.csv, under CC-BY-4.0, free, with attribution. See all downloads.

Want to know when this changes? Point a feed reader or a script at the Atom feed, which carries every confirmed change and is rebuilt hourly, or poll this page's data.json, where every figure carries its observation date and the fingerprint of its source. Both work today and need no address.

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