GPT-6 Luna Max vs Muse Spark Open: price, speed and benchmarks

Choosing between GPT-6 Luna (Max) and Muse Spark Open (Xhigh) also means choosing between OpenAI and Meta. Price separates them more than anything else; on a blended basis Muse Spark Open costs 10 times as much as GPT-6 Luna Max. The figures come from tracked catalogue data, not from our own testing, so treat them as a starting point for a trial on your tasks.

Token pricing and a sample bill

The list prices are $0.10 in and $0.50 out for GPT-6 Luna Max, and $1.25 in and $4.25 out for Muse Spark Open, per million tokens. For output tokens, Muse Spark Open is 8.5 times the price of GPT-6 Luna Max.

A reference job of 1 million input tokens and 200,000 output tokens costs $0.20 with GPT-6 Luna Max and $2.10 with Muse Spark Open, so GPT-6 Luna Max saves $1.90. For a month of coding-assistant traffic at 30 million input and 3 million output tokens, GPT-6 Luna Max would come in 91% lower: $4.50 for GPT-6 Luna Max against $50.25 for Muse Spark Open. On a 3:1 blend of input to output tokens, that works out to $0.20 versus $2.00 per million.

How fast they respond

Once a response is under way, GPT-6 Luna Max produces roughly 121 tokens per second against 207 tokens per second for Muse Spark Open. Muse Spark Open is ahead by 71% on throughput. Time to first token is 2.0 minutes for GPT-6 Luna Max and 0.94 seconds for Muse Spark Open. In an interactive app, Muse Spark Open will feel noticeably more responsive. Waits that long are felt on every chat-style request, though they matter less for batch jobs.

For an 800-token response, first token plus generation comes to roughly 2.1 minutes on GPT-6 Luna Max and 4.8 seconds on Muse Spark Open.

Overall capability: 3.0 points apart

GPT-6 Luna Max records 27.9 on the intelligence index and Muse Spark Open records 24.9. A lead of this size is hard to dismiss as noise.

Across the 109 active models with an intelligence score in the catalogue, GPT-6 Luna Max ranks 62nd and Muse Spark Open ranks 68th.

The catalogue does not yet split either model's score into coding and math indexes.

Value for money

Dividing the blended price by the intelligence index gives a rough cost per point: $0.0072 for GPT-6 Luna Max and $0.080 for Muse Spark Open, per million tokens. GPT-6 Luna Max scores higher and costs less per point, so on price per point there is nothing to trade off.

Generation gap

GPT-6 Luna Max came first, on September 22, 2026; Muse Spark Open followed on October 15, 2026. That is close enough to count them as the same generation.