OpenAI: GPT-6 Luna

OpenAI: GPT-6 Luna is a large language model from OpenAI. It costs $0.100 per million input tokens and $0.500 per million output tokens. Its context window is 1.1M tokens.

ReasoningTool callingStructured outputPrompt cachingBatch tierfile inputimage input

Input / 1M tokens: $0.100
Output / 1M tokens: $0.500
Cached input / 1M: $0.010
Context window: 1.1M

This model also charges $0.01 per search request

That is $10.00 per 1,000 requests, billed on top of the token prices above. On a typical 1,000-in / 500-out exchange the tokens cost $0.0003, so the search fee is 29× the token cost. Per-token rankings elsewhere ignore this entirely.

Who serves it cheapest

3 hosts serve GPT-6 Luna. Same weights, same API - the price difference is pure margin and routing.

Providers serving OpenAI: GPT-6 Luna, cheapest first
Provider	Input / 1M	Output / 1M	Context	Throughput	Uptime 24h
OpenAICheapest	$0.050	$0.250	1.1M	-	82.9%
Azure	$0.100	$0.500	1.1M	-	100.0%
Amazon Bedrock	$0.110	$0.550	1.1M	-	100.0%

The spread between OpenAI and Amazon Bedrock is 2.2× for identical weights. Quantization and context limits differ, so check both columns before switching.

Benchmarks

Independent scores published alongside the catalogue.

Intelligence index: 38.1

About GPT-6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...

Specifications

OpenAI: GPT-6 Luna specifications
Model ID	`openai/gpt-6-luna`
Provider	OpenAI
Context window	1.1M tokens
Max output	128K tokens
Input modalities	file, image, text
Output modalities	text
Knowledge cutoff	-
Open weights	No
Released	September 22, 2026

Cheaper alternatives

Models that cost less than GPT-6 Luna while keeping at least half its context window and every input modality it supports.

Gemini 2.5 Flash Lite

$0.100 in · $0.400 out

1.1× cheaper

GPT-4.1 Nano

$0.100 in · $0.400 out

1.1× cheaper

Muse Spark 1.3 Contributor

$0.100 in · $0.200 out

1.6× cheaper

Muse Spark 1.2 Contributor

$0.100 in · $0.200 out

1.6× cheaper

Summarize

$0.040 in · Free out

6.7× cheaper

Frequently asked

How much does OpenAI: GPT-6 Luna cost?

$0.100 per million input tokens and $0.500 per million output tokens. Cached input reads cost $0.010 per million tokens.

What is the context window of OpenAI: GPT-6 Luna?

1.1M tokens, with up to 128K tokens of output per request.

Does OpenAI: GPT-6 Luna have extra fees beyond per-token pricing?

Yes. OpenAI: GPT-6 Luna charges $0.01 per search request - $10.00 per 1,000 requests - on top of $0.100 per million input tokens and $0.500 per million output tokens. On a typical 1,000-input / 500-output exchange the search fee alone is 29× the token cost.

Which provider serves OpenAI: GPT-6 Luna cheapest?

OpenAI at $0.050 per million input tokens - 2.2× cheaper than Amazon Bedrock, the most expensive of the 3 hosts serving it.

Confirm against the source: OpenAI official pricing.