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Model comparison · Updated 2 Nov 2026

Gemini 3.5 Flash vs Muse Spark Open

Muse Spark Open is about 1.2× cheaper on input ($1.25 against $1.50 per 1M tokens) and on output. Both have a 1.05M-token context window. For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,485 a month for Gemini 3.5 Flash and $945 for Muse Spark Open.

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ModelsAtlas. “Gemini 3.5 Flash vs Muse Spark Open”. Retrieved 2 Nov 2026. https://modelsatlas.com/compare/google/gemini-3-5/vs/meta/muse-spark-open

Model A

Gemini 3.5 Flash

by Google · weights not marked open · GRIDE5

Input / 1M
$1.50
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$9.00
Context1.05M
vs

Model B

Muse Spark Open

by Meta · weights not marked open · GRIDE5

Input / 1M
$1.25
observed We measured
Source
Our catalogue
Retrieved
2 Nov 2026
Output / 1M$4.25
Context1.05M

Key numbers

Standard tier · highlighted = better

Gemini 3.5 Flash
Muse Spark Open
Input / 1M tokens
$1.50
$1.25
Output / 1M tokens
$9.00
$4.25
Batch input / output
$0.75 / $4.50
Not listed
Context window
1,048,576
1,048,576
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
standard
Prices checked
2026-08-17
2026-11-02

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$1,485/mo
$945/mo
RAG over documents2k queries/day · 12k in, 500 out
$1,350/mo
$1,028/mo
Coding agent300 tasks/day · 60k in, 8k out
$1,458/mo
$981/mo

Gemini 3.5 Flash   Muse Spark Open · 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)

Same square. Gemini 3.5 Flash and Muse Spark Open share E5.

Same square as Gemini 3.5 Flash: Gemini 2.5 Pro Preview 06-05 ($1.25), Grok 4.3 ($1.25), Muse Spark 1.1 ($1.25). Open E5

AFreeB<$0.10C$0.10–0.30D$0.30–1E$1–3F$3–10G$10–30H$30+1<32K232–128K3128–256K4256K–1M51M6>1MINPUT PRICE PER 1M TOKENS →CONTEXT WINDOW ↑ · position within a square follows the real valueGemini 2.5 Pro Preview 06-05 · E5Muse Spark 1.1 · E5Muse Spark 1.2 · E5Muse Spark 1.3 · E5Grok 4.3 · E5Gemini 3.5 FlashGemini 3.5 FlashMuse Spark OpenMuse Spark Open
Gemini 3.5 FlashMuse Spark OpenNearest neighboursOpen weights
View the map as a table (1 squares)
SquarePrice bandContext bandModels
GRIDE5$1–31MGemini 3.5 Flash, Muse Spark Open, Gemini 2.5 Pro Preview 06-05, Muse Spark 1.1, Muse Spark 1.2, Muse Spark 1.3, Grok 4.3

Capabilities side by side

Only what our records list

Gemini 3.5 Flash
Muse Spark Open
Vision input
Not disclosed
Not disclosed
Audio input
Not disclosed
Not disclosed
Open weights
Not marked open
Not marked open
Batch tier
Supported
Not listed
Free tier
Not listed
Not listed
Thinking tier
Not listed
Not listed

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

Which should you choose?

Editorial

Choose Gemini 3.5 Flash if…

  • work can wait: it lists a batch tier and the other does not

Choose Muse Spark Open if…

  • you pay by the token: it costs $1.25 per 1M input against $1.50
  • output dominates your bill: $4.25 per 1M output against $9.00

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 Gemini 3.5 Flash better than Muse Spark Open?
We do not benchmark quality, so we cannot say. On the recorded numbers: Muse Spark Open is about 1.2× cheaper on input ($1.25 against $1.50 per 1M tokens) and on output. Both have a 1.05M-token context window. For a support chatbot at 10,000 chats a day, the standard-tier bill is about $1,485 a month for Gemini 3.5 Flash and $945 for Muse Spark Open. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, Gemini 3.5 Flash or Muse Spark Open?
Muse Spark Open: $1.25 against $1.50 per 1M input tokens, and $4.25 against $9.00 per 1M output, on standard pricing.
How much does each cost per 1M tokens?
Gemini 3.5 Flash: $1.50 input and $9.00 output. Muse Spark Open: $1.25 input and $4.25 output. Standard tier, USD.
Which has the larger context window?
Neither: both have 1,048,576 tokens.
Do both offer batch pricing?
Gemini 3.5 Flash lists a batch tier, at 50% of its standard price. Muse Spark Open lists no batch tier.
Can both read images or audio?
Input types recorded for Gemini 3.5 Flash: none recorded. For Muse Spark Open: 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?
Gemini 3.5 Flash: not marked open-weight in our records. Muse Spark Open: 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 $1,485 a month for Gemini 3.5 Flash and $945 for Muse Spark Open. This is our calculation from the listed prices, not a quote.

About the two models

Gemini 3.5 Flash

By Google. $1.50 input and $9.00 output per 1M tokens, 1.05M context, atlas square E5. Tiers listed: batch, standard.

Full specs & pricing →

Muse Spark Open

By Meta. $1.25 input and $4.25 output per 1M tokens, 1.05M context, atlas square E5. Tiers listed: standard.

Full specs & pricing →

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