Metaopen weightsreasoningMuse Spark Open pricing
$1.25 per 1M input tokens and $4.25 per 1M output tokens. In real work that is 0.70¢ per chat answer and 2.1¢ to summarize a 20-page PDF.
What Muse Spark Open costs per task
Token counts estimated from a measured model of the same lab (Gemini 3.8 Flash), rescaled by tokenizer. Reasoning tokens are billed as output.
| Task | Cost | Tokens used | Price rank | Basis |
|---|---|---|---|---|
| Answer a chat question | 0.70¢$6.98 / 1,000 | 35 in · 788 out · 843 reasoning | 252 of 336 | estimated |
| Reply to a customer email | 0.27¢$2.68 / 1,000 | 271 in · 128 out · 424 reasoning | 247 of 336 | estimated |
| Write a 1,500-word blog post | 1.5¢$15.30 / 1,000 | 52 in · 2,621 out · 964 reasoning | 211 of 336 | estimated |
| Write 10 product descriptions | 1.3¢$12.88 / 1,000 | 293 in · 1,127 out · 1,817 reasoning | 239 of 336 | estimated |
| Translate 1,000 words | 2.1¢$20.61 / 1,000 | 1,308 in · 1,297 out · 3,167 reasoning | 242 of 336 | estimated |
| Proofread one page (500 words) | 0.55¢$5.54 / 1,000 | 706 in · 653 out · 443 reasoning | 226 of 336 | estimated |
| Summarize a 20-page PDF | 2.1¢$21.23 / 1,000 | 12,741 in · 535 out · 713 reasoning | 242 of 336 | estimated |
| Extract data from an invoice | 0.69¢$6.86 / 1,000 | 452 in · 539 out · 943 reasoning | 255 of 336 | estimated |
| Analyze a 200-row spreadsheet | 4.2¢$42.38 / 1,000 | 6,304 in · 1,018 out · 7,100 reasoning | 224 of 336 | estimated |
| Answer from 5 retrieved documents (RAG) | 1.4¢$13.72 / 1,000 | 3,608 in · 669 out · 1,499 reasoning | 265 of 336 | estimated |
| Classify 100 support tickets | 3.0¢$29.92 / 1,000 | 1,397 in · 571 out · 6,059 reasoning | 286 of 336 | estimated |
| Review 500 lines of code | 1.5¢$15.32 / 1,000 | 5,207 in · 2,074 out | 184 of 336 | estimated |
| Write a SQL query | 0.69¢$6.92 / 1,000 | 135 in · 546 out · 1,043 reasoning | 254 of 336 | estimated |
| Run a 50-step coding agent | 68¢$680 / 1,000 | 2,194,987 in · 14,715 out · 47,150 reasoning | 196 of 336 | modeled |
Price at every provider
List prices per 1M tokens (input / output) at each host serving Muse Spark Open through OpenRouter today. Hosts can differ in quantization, context and speed.
| Provider | Input / output | Cached input | Context | Uptime |
|---|---|---|---|---|
| M Modalunknown | $1.25 / $4.25 | $0.15 | 1M | 100% |
 Togetherunknown | $1.25 / $4.25 | $0.15 | 1M | 100% |
 Nebiusfp4 | $1.25 / $4.25 | - | 1M | 100% |
 Fireworksunknown | $1.25 / $4.25 | $0.15 | 1M | |
| B BaseTenfp4 | $1.25 / $4.25 | $0.15 | 1M |
Price history
First seen in our price history on Oct 16, 2026 at $1.25 input / $4.25 output. The list price has not changed since.
FAQ
How much does Muse Spark Open cost?
Muse Spark Open costs $1.25 per 1 million input tokens and $4.25 per 1 million output tokens, with cached input at $0.15 (list price on Oct 18, 2026). In practice one chat answer costs about 0.70¢ and summarizing a 20-page PDF about 2.1¢.
Where is Muse Spark Open cheapest?
Among 5 providers we track, the lowest list price today is at Modal: $1.25 input and $4.25 output per 1M tokens.
Does Muse Spark Open charge for reasoning tokens?
Yes. Reasoning (thinking) tokens are billed as output tokens. That is why the cost per task can be much higher than the visible answer suggests - our task costs include them.
Is the Muse Spark Open cost per task measured or estimated?
Estimated: Muse Spark Open was not run directly. Tokens come from Gemini 3.8 Flash and are rescaled by the tokenizer of Meta. Real usage can differ.