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OpenAI: GPT-5 Nano

openai/gpt-5-nano

OpenAI: GPT-5 Nano is a 400,000-token model served on Composite at $0.0313 per million tokens in and $0.250 per million tokens out.

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Specifications

Specifications and pricing as served by Composite
Model IDopenai/gpt-5-nano
ProviderOpenAI
Context window400,000 tokens
Acceptstext, image, file
Returnstext
Input price$0.0313 per million tokens
Output price$0.250 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
ModeratedYes - by the provider
Cost on a monthly planAbout 0.4 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-nano:cheapThink OpenAI $0.0313 per million tokens input · $0.250 per million tokens output

Pricing

$0.0313 per million tokens input · $0.250 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 0.4 plan credits, at the provider's own price.

Provider

OpenAI

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 is priced low enough for high-volume daily roleplay without the per-message cost adding up quickly.

From the provider

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...

Supplied by OpenAI, not written by Composite.