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OpenAI: GPT Luna Latest API Pricing

OpenAI: GPT Luna Latest is an API model from ~openai. It costs $0.1 per 1M input tokens and $0.5 per 1M output tokens, with cached input at $0.01. Its context window is 1,050,000 tokens with up to 128,000 output tokens. A workload of 10M input + 2M output tokens costs about $2 per month.
Input
$0.1
per 1M tokens
Output
$0.5
per 1M tokens
Cached input
$0.01
per 1M tokens
Context window
1.05M
1,050,000 tokens
Blended (80/20)
$0.18
per 1M tokens

This model always redirects to the latest model in the GPT Luna family.

How much does OpenAI: GPT Luna Latest cost for a real workload?

At 10M input + 2M output tokens per month, OpenAI: GPT Luna Latest costs about $2 ($1 input + $1 output). Try your own volumes in the cost calculator.

What are cheaper alternatives to OpenAI: GPT Luna Latest?

Compare OpenAI: GPT Luna Latest with other models

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Frequently asked questions

How much does OpenAI: GPT Luna Latest cost?

OpenAI: GPT Luna Latest costs $0.1 per 1M input tokens and $0.5 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $2.

What is the context window of OpenAI: GPT Luna Latest?

OpenAI: GPT Luna Latest has a context window of 1,050,000 tokens and can return up to 128,000 output tokens per response.

What are cheaper alternatives to OpenAI: GPT Luna Latest?

Cheaper models include PrismML: Ternary Bonsai 2 27B ($0.075 in / $0.5 out), NVIDIA: Nemotron 3 Super ($0.08 in / $0.45 out), ByteDance Seed: Seed-2.0-Mini ($0.1 in / $0.4 out). See the full list on this page.

Is OpenAI: GPT Luna Latest free to use?

No. OpenAI: GPT Luna Latest is a paid model at $0.1 input / $0.5 output per 1M tokens. 20 free models are listed on the free models page.

Provider: ~openai · Model ID: ~openai/gpt-luna-latest · Modality: text+image+file->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices