Meta's open-weight Muse Spark (816B MoE, 42B active), trained for agentic coding: higher first-attempt accuracy, reliable tool calling and deep codebase understanding. 1M context, image input, reasoning.
Modalities
Text+Image → Text
Below release
Not established
Weights
Published
meta-models/Muse-Spark-Open-816B-A42B
Where it sits in the catalogue Kyma measures
Every number against every text model Kyma prices per token — a stated rule, not a chosen line-up.
$1.6875
output $5.7375
median $1.013 · best $0.0494
$5.7375
per 1M tokens generated
median $3.645 · best $0.218
100%
30 observations since 2026-10-25
median 100.0% · best 100.0%
160 tok/s
probe median, one fixed prompt
median 46.1 tok/s · best 160.1 tok/s
1.33 s
probe median, to a complete answer
median 1.33 s · best 0.46 s
1.05M
max output 943,718
published by Meta, not measured here
Tick above each rail is this model, below it the other 83. Dashed rule is the field median, solid is its best. Better is left; the axis stops at the 90th percentile, so a few models sit past its right edge.
Usage
How much this model is actually called here.
Rank
#85
of 112 active models
Tokens served
16.2K
all-time
Platform share
0.0%
of all tokens
Pricing
Pay per token. Cached input bills at this model’s own cached rate, listed below.
+ Estimate your workload− Estimate your workload
Estimated monthly cost
$187
$6.24 / day on Muse Spark Open
Same workload on:
Estimates use list pricing. Actual bills depend on real token counts, and every response includes its exact cost.
How it compares
Against the peers people actually weigh it against.
| Spec | Muse Spark Open | Llama 4 Maverick | Muse Spark 1.1 |
|---|---|---|---|
| Input /1M | $1.6875 | $0.3344 | $1.542 |
| Output /1M | $5.7375 | $1.337 | $5.243 |
| Context | 1M | 1M | 1M |
| Tools | Yes | Yes | Yes |
| Reasoning | Yes | No | Yes |
| Throughput | 160 tok/s |
Quick start
Up and running in under two minutes.
- 1
Create an API key
Sign up and grab a key from the dashboard. Muse Spark Open needs a top-up — the signup credit covers the free tier.
Get API key → - 2
Make your first request
Drop in your key and send a chat completion — fully OpenAI-compatible.
curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "muse-spark-open", "messages": [ {"role": "user", "content": "Explain prompt caching in one paragraph."} ] }' - 3
Stream responses
Add
"stream": trueto receive tokens as they arrive.curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "muse-spark-open", "stream": true, "messages": [{"role": "user", "content": "Hello!"}] }'
FAQ
Common questions about this model.
What is the context window of Muse Spark Open?
How much does the Muse Spark Open API cost?
Does Muse Spark Open support function calling?
Are the weights for Muse Spark Open publicly available?
Is Muse Spark Open ever served below the precision its creator released it at?
How do I use Muse Spark Open?
More models by Meta
| Model | Context | Input | Output |
|---|---|---|---|
Muse Wonder | 1M | $5.40 | $27.00 |
Muse Spark 1.3 | 1M | $1.688 | $5.738 |
Muse Glimmer 30B | 131K | $0.405 | $1.62 |
Muse Spark 1.2 | 1M | $1.773 | $6.025 |
Muse Spark 1.1 | 1M | $1.542 | $5.243 |
Llama 4 Maverick | 1M | $0.3344 | $1.337 |
Llama 3.3 70B | 128K | $0.135 | $0.432 |
