Model comparison · Updated 10 Oct 2026

Muse Spark 1.3 Contributor vs GPT-6 Luna

Muse Spark 1.3 Contributor and GPT-6 Luna cost the same on input, $0.10 per 1M tokens. GPT-6 Luna has the larger context window (1.05M against 1.05M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $63.00 a month for Muse Spark 1.3 Contributor and $90.00 for GPT-6 Luna.

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ModelsAtlas. “Muse Spark 1.3 Contributor vs GPT-6 Luna”. Retrieved 10 Oct 2026. https://modelsatlas.com/compare/meta/muse-spark-1-3-contributor/vs/openai/gpt-6-luna

Model A

Muse Spark 1.3 Contributor

by Meta · weights not marked open · GRIDC5

Input / 1M
$0.10
observed We measured
Source
Our catalogue
Retrieved
10 Oct 2026

Output / 1M$0.20

Context1.05M

Model B

GPT-6 Luna

by OpenAI · weights not marked open · GRIDC6

Input / 1M
$0.10
observed We measured
Source
Our catalogue
Retrieved
10 Oct 2026

Output / 1M$0.50

Context1.05M

Key numbers

Standard tier · highlighted = better

Muse Spark 1.3 Contributor

GPT-6 Luna

Input / 1M tokens

$0.10

Output / 1M tokens

$0.20

$0.50

Batch input / output

Not listed

$0.05 / $0.25

Context window

1,048,576

1,050,000

Input types

Not disclosed

Weights

Not marked open

Tiers listed

standard

batch, standard

Prices checked

2026-10-10

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out

$63.00/mo

$90.00/mo

RAG over documents2k queries/day · 12k in, 500 out

$78.00/mo

$87.00/mo

Coding agent300 tasks/day · 60k in, 8k out

$68.40/mo

$90.00/mo

Muse Spark 1.3 Contributor GPT-6 Luna · Derived from the standard-tier prices above, input and output tokens per request as stated, 30 days. Excludes caching discounts and batch. Try your own numbers.

On the atlas

Price band (A–H) × context band (1–6)

1 square apart. GPT-6 Luna (C6) sits 1 context band larger than Muse Spark 1.3 Contributor (C5).

Same square as Muse Spark 1.3 Contributor: Claude Haiku 5.5 ($0.10), Muse Spark 1.2 Contributor ($0.10), Qwen3.8 Flash ($0.15). Same square as GPT-6 Luna: Llama 4 Scout ($0.10), GPT-5.6 Luna ($0.20). Open C5 · Open C6

Muse Spark 1.3 ContributorGPT-6 LunaNearest neighboursOpen weights

View the map as a table (2 squares)

Square	Price band	Context band	Models
GRIDC5	$0.10–0.30	1M	Muse Spark 1.3 Contributor, Claude Haiku 5.5, Muse Spark 1.2 Contributor, Qwen3.8 Flash, Qwen3.8 Omni Flash, Llama 4 Maverick, Qwen3.6 Flash
GRIDC6	$0.10–0.30	>1M	GPT-6 Luna, Llama 4 Scout, GPT-5.6 Luna

Capabilities side by side

Only what our records list

Muse Spark 1.3 Contributor

GPT-6 Luna

Vision input

Not disclosed

Audio input

Not disclosed

Open weights

Not marked open

Batch tier

Not listed

Supported

Free tier

Not listed

Thinking tier

Not listed

Neither record lists input types, so we do not claim any.

Which should you choose?

Editorial

Choose Muse Spark 1.3 Contributor if…

output dominates your bill: $0.20 per 1M output against $0.50

Choose GPT-6 Luna if…

your prompts are long: it takes 1,050,000 tokens against 1,048,576
work can wait: it lists a batch tier and the other does not

Each reason is a fact from the tables above. Picking between them is our judgement, and we do not benchmark quality: price and context are what we can measure, so test both on your own prompts before you commit.

Questions

Is Muse Spark 1.3 Contributor better than GPT-6 Luna?

We do not benchmark quality, so we cannot say. On the recorded numbers: Muse Spark 1.3 Contributor and GPT-6 Luna cost the same on input, $0.10 per 1M tokens. GPT-6 Luna has the larger context window (1.05M against 1.05M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $63.00 a month for Muse Spark 1.3 Contributor and $90.00 for GPT-6 Luna. Which is better for you depends on your task; test both on your own prompts.

Which is cheaper, Muse Spark 1.3 Contributor or GPT-6 Luna?

They cost the same on input, $0.10 per 1M tokens. Output is $0.20 for Muse Spark 1.3 Contributor and $0.50 for GPT-6 Luna.

How much does each cost per 1M tokens?

Muse Spark 1.3 Contributor: $0.10 input and $0.20 output. GPT-6 Luna: $0.10 input and $0.50 output. Standard tier, USD.

Which has the larger context window?

GPT-6 Luna, with 1,050,000 tokens. Muse Spark 1.3 Contributor has 1,048,576 tokens.

Do both offer batch pricing?

Muse Spark 1.3 Contributor lists no batch tier. GPT-6 Luna lists a batch tier, at 50% of its standard price.

Can both read images or audio?

Input types recorded for Muse Spark 1.3 Contributor: none recorded. For GPT-6 Luna: none recorded. Where a record lists none we say so rather than guess; check each vendor's documentation before relying on a capability.

Is either model open-weight?

Muse Spark 1.3 Contributor: not marked open-weight in our records. GPT-6 Luna: not marked open-weight in our records.

What would each cost for a support chatbot?

At 10,000 chats a day, 1,500 input and 300 output tokens each, 30 days, standard tier: about $63.00 a month for Muse Spark 1.3 Contributor and $90.00 for GPT-6 Luna. This is our calculation from the listed prices, not a quote.

About the two models

Muse Spark 1.3 Contributor

By Meta. $0.10 input and $0.20 output per 1M tokens, 1.05M context, atlas square C5. Tiers listed: standard.

Full specs & pricing →

GPT-6 Luna

By OpenAI. $0.10 input and $0.50 output per 1M tokens, 1.05M context, atlas square C6. Tiers listed: batch, standard.

Full specs & pricing →

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