GPT-5.1 Codex mini

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

openai/gpt-5.1-codex-mini

Organization: OpenAI
Family: gpt-codex
Providers: 10
Context: 400,000
Output limit: 128,000
Knowledge: 2024-09-30
Release: 2025-11-13
Updated: 2025-11-13
Weights: Closed
Input: text, image
Output: text
Capabilities: Tools, Reasoning, Structured

Providers

Compare every cataloged offer for this model, including its provider, route, token limits, price, and capabilities.

10 offers · USD per million tokens

Provider	Model ID	Context	Output	Input / output · 1M	Reasoning	Tools	Structured	Details
DevPass (LLM Gateway)	gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
Eden AI	azure/gpt-5.1-codex-mini	272,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
Impossibl	openai/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
Kilo Gateway	openai/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
LLM Gateway	azure/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	No	View
NanoGPT	openai/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	No	No	View
Ofox	openai/gpt-5.1-codex-mini	256,000	65,536	$0.20 / $1.60	Yes	Yes	Yes	View
Azurevia OpenRouter	openai/gpt-5.1-codex-mini unknown	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
OrcaRouter	openai/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View
Vercel AI Gateway	openai/gpt-5.1-codex-mini	400,000	128,000	$0.25 / $2.00	Yes	Yes	Yes	View

Prices and limits apply to each offer. A dash means the value is not provided. OpenRouter offers show the hosting provider and routing channel separately.

Pricing

Compare token rates and cache charges across available routes and hosting configurations.

USD per million tokens

Input from$0.20Per 1M input tokens

Output from$1.60Per 1M output tokens

Available offers10Across 10 providers

Lowest listed input and output prices across the offers above; they may belong to different providers. These are base rates, before conditional pricing, discounts or additional fees.

Endpoint price comparisonLatest observed snapshot · 1 lowest-priced configuration

InputOutput

Azureazure

$0.25$2.00

openai/gpt-5.1-codex-miniObserved Oct 4, 2026, 11:31 AM UTC

Input: $0.25
Output: $2.00
Cache read: $0.03

Additional fees and pricing conditions

web search: $0.01 / search

Hosting prices through OpenRouter All endpoints and cache rates

Endpoint	Input / 1M	Output / 1M	Cache read / 1M	Cache write / 1M
Azureazure	$0.25	$2.00	$0.03	—

Each row is a hosting configuration. Open an offer in Providers for its full pricing conditions and additional fees. Endpoint observations may differ from the routing catalog's base price.

Performance

Review reported latency and output-throughput percentiles from the latest observed rolling window.

Latest 30-minute observation

Time to first token · milliseconds

Latency distributionRolling 30-minute snapshot · 1 endpoint

P50P75P90P99

Azureazure

4,235–35,086.21 ms

All latency percentiles 1 endpoints

Endpoint	P50	P75	P90	P99
Azureazure	4,235 ms	7,696.75 ms	13,501.4 ms	35,086.21 ms

Output throughput · tokens per second

Throughput distributionRolling 30-minute snapshot · 1 endpoint

P50P75P90P99

Azureazure

134.5–174 t/s

All throughput percentiles 1 endpoints

Endpoint	P50	P75	P90	P99
Azureazure	134.5 t/s	145.75 t/s	169.5 t/s	174 t/s

Percentiles describe the observed request distribution. These are snapshots of a rolling window, not a historical time series.

Uptime

Compare successful request rates across the latest 5-minute, 30-minute, and 24-hour observations.

Successful requests by window

Availability by endpointCurrent overlapping windows · 1 endpoint

Endpoint5 minutes30 minutes24 hours

AzureazureObserved Oct 4, 2026, 11:31 AM UTC

—

99.96%

Reported by OpenRouter at the time of collection; rate-limited requests are excluded. A dash means no measurement was reported. This is not a live availability check.

Benchmarks

Review attributed evaluation results on each source's original scale.

External evaluations

openai/gpt-5.1-codex-miniObserved Oct 4, 2026, 11:31 AM UTC

Design Arena	Category	Elo	Win rate	Rank
models	3d	1,004	32.8%	105
models	asciiart	1,115	43%	56
models	codecategories	1,100	41.5%	95
models	dataviz	1,105	40.6%	93
models	gamedev	1,105	43.4%	88
models	svg	977	35.3%	86
models	uicomponent	1,088	41%	93
models	website	1,117	42.8%	95

Sources: Artificial Analysis and Design Arena, via OpenRouter. Scores retain their original scales and are not OpenAI Suite ratings.

Detailed evaluations

Evaluation	Configuration	Source	Results	Details
models · uicomponent	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,088 Elo	Details
models · codecategories	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,100 Elo	Details
models · gamedev	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,105 Elo	Details
models · dataviz	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,105 Elo	Details
models · website	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,117 Elo	Details
models · asciiart	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,115 Elo	Details
models · 3d	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	1,004 Elo	Details
models · svg	GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini-20251113	Design Arena	977 Elo	Details

Sources: Artificial Analysis, Design Arena and OpenRouter. Evaluation configurations and scales differ; results are not interchangeable. Updated Oct 4, 2026.

Technical details & API

Explore specifications, supported parameters, reasoning controls, and API identifiers for each OpenRouter route.

Current route specifications

openai/gpt-5.1-codex-miniObserved Oct 4, 2026, 11:31 AM UTC

Context: 400,000
Maximum output: 128,000
Tokenizer: GPT
Input: image, text
Output: text
Moderation: No
Added to OpenRouter: 2025-11-13

Base URLhttps://openrouter.ai/api/v1

Model IDopenai/gpt-5.1-codex-mini

Version IDopenai/gpt-5.1-codex-mini-20251113

Reasoning

Required: No
Enabled by default: Not reported
Default effort: medium
Supported efforts: high, medium, low

Supported parameters

include_reasoning
max_completion_tokens
reasoning
reasoning_effort
response_format
seed
structured_outputs
tool_choice
tools
verbosity

Frequently asked questions

Answers based on the model metadata and serving offers currently in the catalog.

How much does GPT-5.1 Codex mini cost?

Listed rates start at $0.20 per million input tokens and $1.60 per million output tokens. Prices vary by provider and configuration; see Pricing for details.

Which providers offer GPT-5.1 Codex mini?

There are 10 cataloged offers across 10 providers. Compare model IDs, prices and limits in Providers.

What is the context window?

The cataloged model context is 400,000 tokens. Each serving endpoint may apply a different limit.

Does it support tools and structured output?

Tool calling: Yes. Structured output: Yes. Support can vary by endpoint.

Catalog history · 2 recorded revisions

Metadata observations since this model was first cataloged. These are not model release versions.

Sep 14, 2026 · 008dda772e41
Sep 12, 2026 · b68b56c22c2c