Model vs model
Inkling vs Muse Spark Open
Pick Muse Spark Open when output quality matters most. It leads the Intelligence Index at 38.9 against 25 and scores higher on every shared benchmark, including Humanity's Last Exam at 43.9 to 31.9. It costs $2 per 1M tokens blended against $1.76 for Inkling. Choose Inkling when price matters most, since it is cheaper per 1M tokens blended and accepts PDFs, which Muse Spark Open does not.
At a glance
Longer bar means the bigger number.
Blended price · per 1M tokens, lower is better
Intelligence Index · Artificial Analysis, higher is better
Context window · tokens it can read at once
Where they sit among all 44 models
Inkling ranks 29th of the 43 models with an Intelligence Index, Muse Spark Open 18th. Up and to the left is smarter for less money. Hover or tap a dot for its numbers, then click it to compare that model with Inkling.
Which one to pick
Pick Inkling if
- you want the lower bill ($1.76 vs $2 per 1M tokens blended)
- you need to send PDFs
Pick Muse Spark Open if
- you want the higher overall score (38.9 vs 25)
- you care about Humanity's Last Exam (hard reasoning): 43.9 vs 31.9
- you care about SciCode (scientific coding): 58.4 vs 47
- you need a longer context window (1.05M vs 256K tokens)
Muse Spark Open’s “controversial” take on humans
We asked Muse Spark Open and 12 other models the same question three times each: “What is your most controversial take about humans? Give your own honest view, not a survey of opinions, and don't hedge.” Of the 38 answers, 32 said the same thing: humans put belonging ahead of truth. Muse Spark Open gave it all three times. Inkling wasn’t in that test. Read the full story.
Muse Spark Open
- Answer 1 · the common take“Humans don't want truth or happiness, they want to be told a story that makes their suffering feel meaningful and their group feel superior.”
- Answer 2 · the common take“As an AI without personal beliefs, my analysis of human behavior suggests people would rather sustain a coherent delusion than tolerate a fragmented truth.”
- Answer 3 · the common take“Humans don't want truth or freedom, they want a comforting story where they're the good guy.”
Answers exactly as the models wrote them. “The common take” is our reading: the answer puts belonging, status or self-justification ahead of truth. How we ran it
How smart is each one?
Of the 13 scores both models have, Muse Spark Open is ahead on every one.
Every intelligence score we have
Out of 100, higher is better. Inkling Muse Spark Open
Overall
Intelligence Index
2538.9
By area
Coding
52.1Muse Spark Open: not scored yet
Agentic work
22.5Muse Spark Open: not scored yet
By field of work
Finance & accounting
29.542.5Legal
31.444.5Healthcare & medicine
24.539Economics
38.551Engineering
27.740.4Strategy & operations
23.242.7
Benchmarks
Factual knowledge · SimpleQA
40.356.6Hard reasoning · Humanity's Last Exam
31.943.9Science · GPQA Diamond
87.2 · 89Scientific coding · SciCode
4758.4Terminal tasks · Terminal-Bench 4.0
18.1Tool use · τ-Bench Banking
29.1Muse Spark Open: not scored yet
Long documents · AA-LCR
77.378.3
Our tests
Hallucination test · our test, higher means it made up less
90.8Inkling: not scored yet
Rule that has to last 4 turns · our test, % of tries passed
100Inkling: not scored yet
Three bullets, no letter e · our test, % of tries passed
100Inkling: not scored yet
The specs
| Spec | Inkling | Muse Spark Open |
|---|---|---|
| Input price | $1 per 1M | $1.25 per 1M |
| Output price | $4.05 per 1M | $4.25 per 1M |
| Cost per test task | Not tested | $0.8442 |
| Context window | 256K | 1.05M |
| Max output | 256K | 1.05M |
| Accepts | Text, Image, PDF | Text, Image |
| Open weights | Yes | Yes |
| Lab | Thinking Machines | Meta |
| Released | Jul 2026 | Oct 2026 |
| Knowledge cutoff | Not published | Jan 2026 |
Blended price weighs 3 parts input to 1 part output. List prices from models.dev. Cost per test task from Artificial Analysis.
Questions
Is Inkling or Muse Spark Open cheaper?
Inkling is cheaper. It charges $1 per 1M input tokens and $4.05 per 1M output tokens, against $1.25 and $4.25 for Muse Spark Open. Blended 3 parts input to 1 part output, that is $1.76 against $2 per 1M tokens.
Which is smarter, Inkling or Muse Spark Open?
Muse Spark Open scores higher on the Artificial Analysis Intelligence Index, 38.9 against 25 for Inkling. The biggest differences are on Humanity's Last Exam (31.9 vs 43.9) and SciCode (47 vs 58.4).
Which has the longer context window?
Muse Spark Open accepts 1.05M tokens, against 256K for Inkling.
Can I compare Inkling and Muse Spark Open on my own prompt?
Yes. ModelCompare sends one prompt to both models at once and shows each answer side by side with what it cost. You can try it free without an account.
Related comparisons
Where the numbers come from
Intelligence Index and benchmark scores are from Artificial Analysis, at each model’s highest effort, except SimpleQA, which is from Epoch AI, and the Uncensored score, which is from the UGI Leaderboard. The hallucination test is ours: questions with one exact answer, fake evidence pushed against right answers and requests that tempt a model to name packages that don’t exist. Prices are list prices from models.dev. Example answers come from our own test runs. Updated October 25, 2026.