Which is cheaper, GPT-5.6 Sol Pro or Muse Spark 1.2?

Neither: both run at $8 per million tokens, three parts input to one part output, read on 16 Sept 2026.

Where is each one cheapest?

GPT-5.6 Sol Pro: nobody goes below the maker's own price with a reason we can point at, so $8 is the number to beat. Muse Spark 1.2: nobody goes below the maker's own price with a reason we can point at, so $8 is the number to beat.

Can I buy both from one provider?

Yes. 5 providers sell both: NanoGPT, Nous Portal, OpenRouter, Kilo Gateway, LLMTR. The cheapest of them for the two together is NanoGPT.

Which holds more context?

GPT-5.6 Sol Pro, at 1.1M tokens against 1M.

GPT-5.6 Sol Pro vs Muse Spark 1.2.

model vs model · prices as of 16 Sept 2026

GPT-5.6 Sol Pro takes 2 of 5 rounds against Muse Spark 1.2. Both cost $8 per million tokens to run.

OpenAIwins 2 rounds

GPT-5.6 Sol Pro

$8/M tokens

OpenAI list price, nothing below it is accounted for · $0.90 per 1,000 pages

1.1M context · tool calling · reads images

Muse Spark 1.2

$8/M tokens

Meta list price, nothing below it is accounted for · $1.01 per 1,000 pages

1M context · tool calling · reads images

List price in (lower wins)

$1/M

$1.25/M

List price out (lower wins)

$5/M

$4.25/M

Cheapest we can explain (lower wins)

none below list

Standard price (lower wins)

$8/M

Cost per 1,000 pages (lower wins)

$0.90

$1.01

Context

1.1M tokens

1M tokens

Open weights

not stated

Tool calling

yes

Structured output

yes

Reads images

yes

Reasoning

yes

Released

9 Jul 2026

5 Aug 2026

Providers selling it

Price we measure against

the maker's own

Trains on your prompts (no is better)

no provider to check

Providers selling both · 5

NanoGPT$16 / $3.90
Nous Portal$16 / $8
OpenRouter$16 / $8
Kilo Gateway$32 / $8
LLMTR$32 / $8

GPT-5.6 Sol Pro then Muse Spark 1.2, per million tokens

Go further

open in the compare tool →every price for GPT-5.6 Sol Pro every price for Muse Spark 1.2

Add a third or fourth model, or switch the weighting, in the tool.

What moved in the last seven days

GPT-5.6 Sol ProOpenAIOpenAI's list price, in and out per million tokens$2 / $10 $1 / $550% cheaper · 16 Sept 2026
GPT-5.6 Sol ProNous Portal$1.60 / $8 $2 / $1025% dearer · 16 Sept 2026
Muse Spark 1.2Nous Portal$1 / $3.40 $1.25 / $4.2525% dearer · 16 Sept 2026

Frequently asked

Which is cheaper, GPT-5.6 Sol Pro or Muse Spark 1.2?: Neither: both run at $8 per million tokens, three parts input to one part output, read on 16 Sept 2026.
Where is each one cheapest?: GPT-5.6 Sol Pro: nobody goes below the maker's own price with a reason we can point at, so $8 is the number to beat. Muse Spark 1.2: nobody goes below the maker's own price with a reason we can point at, so $8 is the number to beat.
Can I buy both from one provider?: Yes. 5 providers sell both: NanoGPT, Nous Portal, OpenRouter, Kilo Gateway, LLMTR. The cheapest of them for the two together is NanoGPT.
Which holds more context?: GPT-5.6 Sol Pro, at 1.1M tokens against 1M.

Prices exclude tax and are per million tokens, read 16 Sept 2026 from each provider's own catalog. The standard price blends three parts input to one part output; a page is 600 tokens in and 60 out. Bars are scaled to the larger value in each row.