How much does GPT-5.1-Codex-Mini cost?

On the OpenRouter route, GPT-5.1-Codex-Mini costs $0.25 per 1 million input tokens and $2.00 per 1 million output tokens, in US dollars. Input tokens that GPT-5.1-Codex-Mini reads from the prompt cache cost $0.03 per 1 million tokens. LLMCompare verified this price on 21 Oct 2026.

What is the context length of GPT-5.1-Codex-Mini?

GPT-5.1-Codex-Mini has a context length of 400,000 tokens and returns up to 128,000 output tokens in one call.

What inputs does GPT-5.1-Codex-Mini accept?

GPT-5.1-Codex-Mini accepts these inputs: Text, Image. GPT-5.1-Codex-Mini returns: Text.

Which reasoning effort levels does GPT-5.1-Codex-Mini support?

GPT-5.1-Codex-Mini supports these reasoning effort levels: high, medium, low. Reasoning is always on for GPT-5.1-Codex-Mini and cannot be turned off.

Can I test GPT-5.1-Codex-Mini on my own data?

Not yet. LLMCompare lists the prices and parameters of GPT-5.1-Codex-Mini, but no route to GPT-5.1-Codex-Mini is configured on LLMCompare, so it cannot be selected for an evaluation.

GPT-5.1-Codex-Mini

by OpenAIopenai/gpt-5.1-codex-mini

Text
No route yet
Released 13 Nov 2025

LLMCompare cannot run GPT-5.1-Codex-Mini yet.No route to this model is configured on this site yet. Its prices and parameters are listed below for reference.

See the models that can be run now

GPT-5.1-Codex-Mini at a glance

Context length: 400,000 tokens
Maximum output: 128,000 tokens
Accepts: Text, Image
Returns: Text
Features: ReasoningJSON outputTool callingPrompt cachingImage input
Reasoning effort levels: highmediumlowReasoning is always on for this model.
Released: 13 Nov 2025
Knowledge cutoff: Not published

Model facts synced from the OpenRouter model list on 21 Oct 2026.

GPT-5.1-Codex-Mini pricing by route

A route is the service LLMCompare calls to reach the model. GPT-5.1-Codex-Mini has 1 route. Prices are in US dollars.

Prices of GPT-5.1-Codex-Mini on each route
Route	On LLMCompare	Inputper 1M tokens	Outputper 1M tokens	Cache readper 1M tokens	Price verified on	Source
OpenRouterDefault	Not configured	$0.25	$2.00	$0.03	21 Oct 2026	openrouter.ai/openai/gpt-5.1-codex-mini

The cost shown in an LLMCompare report is calculated from these prices as they were at the time of the run.

Cost calculator

Estimate what a batch of calls to GPT-5.1-Codex-Mini costs. The starting numbers are examples. Change them to match your task.

Input tokens per call

Input tokens read from cache

Part of the input tokens above, billed at the cache read price.

Output tokens per call

Reasoning tokens per call

Billed in addition to the output tokens.

Number of calls

Cost per call: $0.0013; 2 credits
Cost of 100 calls: $0.125; 200 credits

Calculated from the OpenRouter prices verified on 21 Oct 2026. Credits are the cost plus a 20% service fee, at $0.001 per credit, rounded up for each call, with a minimum of 1 per call. A real run is charged for the usage the provider reports.

Parameters you can set

These are the parameters LLMCompare can set when it calls the model through OpenRouter.

Parameters of GPT-5.1-Codex-Mini
Parameter	Type	Range or options	Default
`max_tokens`	Integer	1 to 128,000	Provider default
`reasoning_effort`	One of	`highmediumlow`	`medium`
`seed`	Integer	-2,147,483,648 to 4,294,967,295	Provider default
`response_format`	One of	`textjson_object`	Provider default

About GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

Description as published for this model. LLMCompare has not edited it.

Models to compare with GPT-5.1-Codex-Mini

Text models from the same provider and models at the nearest price. The order is not a ranking.

Models to compare with GPT-5.1-Codex-Mini
Model	Context	Max output	Input priceper 1M tokens	Output priceper 1M tokens	Features	Released	On LLMCompare
GPT-5 MiniOpenAI`openai/gpt-5-mini`	400k	128k	$0.25	$2.00	ReasoningJSONToolsCacheVision	7 Aug 2025	No route yet
GPT-4.1 MiniOpenAI`openai/gpt-4.1-mini`	1.05M	32.8k	$0.40	$1.60	JSONToolsCacheVision	14 Apr 2025	No route yet
GPT-3.5 TurboOpenAI`openai/gpt-3.5-turbo`	16.4k	4.1k	$0.50	$1.50	JSONTools	28 May 2023	No route yet
Qwen3.6 27BQwen`qwen/qwen3.6-27b`	262k	65.5k	$0.25	$2.00	JSONToolsCacheVision	27 Apr 2026	No route yet
Seed-2.0-LiteByteDance Seed`bytedance-seed/seed-2.0-lite`	262k	131k	$0.25	$2.00	ReasoningJSONToolsVision	10 Mar 2026	No route yet
Qwen3.6 PlusQwen`qwen/qwen3.6-plus`	1M	65.5k	$0.325	$1.95	JSONToolsVision	2 Apr 2026	No route yet

Questions about GPT-5.1-Codex-Mini

How much does GPT-5.1-Codex-Mini cost?: On the OpenRouter route, GPT-5.1-Codex-Mini costs $0.25 per 1 million input tokens and $2.00 per 1 million output tokens, in US dollars. Input tokens that GPT-5.1-Codex-Mini reads from the prompt cache cost $0.03 per 1 million tokens. LLMCompare verified this price on 21 Oct 2026.
What is the context length of GPT-5.1-Codex-Mini?: GPT-5.1-Codex-Mini has a context length of 400,000 tokens and returns up to 128,000 output tokens in one call.
What inputs does GPT-5.1-Codex-Mini accept?: GPT-5.1-Codex-Mini accepts these inputs: Text, Image. GPT-5.1-Codex-Mini returns: Text.
Which reasoning effort levels does GPT-5.1-Codex-Mini support?: GPT-5.1-Codex-Mini supports these reasoning effort levels: high, medium, low. Reasoning is always on for GPT-5.1-Codex-Mini and cannot be turned off.
Can I test GPT-5.1-Codex-Mini on my own data?: Not yet. LLMCompare lists the prices and parameters of GPT-5.1-Codex-Mini, but no route to GPT-5.1-Codex-Mini is configured on LLMCompare, so it cannot be selected for an evaluation.