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OpenAI: GPT-5.1-Codex

openai/gpt-5.1-codex

OpenAI: GPT-5.1-Codex is a 400,000-token model served on Composite at $1.56 per million tokens in and $12.5 per million tokens out.

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Specifications

Specifications and pricing as served by Composite
Model IDopenai/gpt-5.1-codex
Providercv11
Context window400,000 tokens
Acceptstext, image
Returnstext
Input price$1.56 per million tokens
Output price$12.5 per million tokens
Prompt cachingSupported — cached input is billed at the provider's cache rate, on credits and plans alike
Web search$0.0125 per result
ThinkingAlways on for this model
ModeratedNo
Cost on a monthly planAbout 20 plan credits per typical call (8k in, 1k out)
Routing endpoints2 (base plus 1 routing variant)

Measured on Composite

This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.

Routing variants

The same model behind 1 alternative endpoint. Call the id directly to pin a route; the base id above picks for you.

RouteModel IDProviderPrice
cheapThink openai/gpt-5.1-codex:cheapThink cv11 $1.56 per million tokens input · $12.5 per million tokens output

Pricing

$1.56 per million tokens input · $12.5 per million tokens output

Credits pay the provider’s price plus 25%; cache hits cost less.

On a monthly plan, a typical call (8k tokens in, 1k out) uses about 20 plan credits, at the provider's own price.

Provider

cv11

Roleplay fit

This is an OpenAI model, a dependable baseline with broad instruction-following and consistent formatting across long conversations.

Context behavior

With a 400,000-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.

Cost for regular use

It sits in the mid-range on price, a reasonable pick for regular roleplay use without going for the cheapest option available.

From the provider

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

Supplied by cv11, not written by Composite.