Muse Spark 1.3 vs Gemini 3.8 Flash
Official Meta and Google API prices and LMArena scores, checked 2026-11-07. Add up to 2 more models to compare 4.
Gemini 3.8 Flash is cheaper and wins more LMArena tasks.
Gemini 3.8 Flash is 1.7x cheaper on input and 1.1x cheaper on output. Gemini 3.8 Flash scores 27 points higher for creative writing; Muse Spark 1.3 scores 26 points higher for coding. Across 8 shared LMArena tasks, Gemini 3.8 Flash leads 5 to 2 (1 tied). A medium month (20M input + 5M output tokens) costs $46.25 on Muse Spark 1.3 and $33.75 on Gemini 3.8 Flash.
- Pick Muse Spark 1.3 if you care most about coding (+26) and long documents (+6).
- Pick Gemini 3.8 Flash if you want the lower bill ($33.75 vs $46.25 for a medium month), you care most about creative writing (+27), reasoning and math (+21) and roleplay (+20) or you reuse long prompts (cached input $0.075 vs $0.15).
Medium: 20M input + 5M output tokens a month at list price (short-context rate, no caching or batch discounts).
Marked side is better: lower for prices, higher for context and scores. Bars are scaled to the larger of the two.
| Spec | Muse Spark 1.3 | Gemini 3.8 Flash |
|---|---|---|
| Price per 1M tokens | ||
| Input | $1.25 | $0.75 |
| Cached input | $0.15 | $0.075 |
| Output | $4.25 | $3.75 |
| Blend 3:1 | $2 | $1.50 |
| Sample month, medium | $46.25 | $33.75 |
| Context | ||
| Context window | 1M tokens | 1M tokens |
| Quality (LMArena, out of 100) | ||
| Coding | 41/100 #14 of 50 | 15/100 #25 of 50 |
| Chat | 51/100 #6 of 51 | 55/100 #5 of 51 |
| Creative writing | 27/100 #10 of 51 | 54/100 #5 of 51 |
| Roleplay and characters | 26/100 #8 of 51 | 46/100 #3 of 51 |
| Reasoning and math | 50/100 #8 of 51 | 71/100 #4 of 51 |
| Vision | 79/100 #5 of 33 | 84/100 #4 of 33 |
| Long documents | 73/100 #6 of 12 | 67/100 #8 of 12 |
| Cheap bulk and agents | 40/100 #15 of 37 | 40/100 #14 of 37 |
| Details | ||
| Provider | Meta | |
| API model id | muse-spark-1.3 | gemini-3.8-flash |
| Notes | Contributor mode (trains on your data): $0.10 in, $0.20 out. | Through Dec 31, 2026. From Jan 1, 2027: $1.50 in, $7.50 out. |
| Sources | ||
| Last checked | 2026-11-07 | 2026-11-07 |
| Official pricing | Meta pricing | Google pricing |
Plans from data checked hourly against each vendor's official pricing page. Vendors state limits in different units, so we quote them as published. Team and enterprise plans are per seat.
API prices in USD per 1M tokens from each provider's official pricing page. Blend 3:1 = (3 x input + output) / 4. Sample month = stated input and output tokens at the list price, no caching. Quality: relative score out of 100 on each LMArena leaderboard (100 = top model we price on that board, n/a = not ranked there), data licensed CC BY 4.0. See how we pick.
Where each one ranks on LMArena
Relative score out of 100 on each leaderboard (100 = the top model we price there), with the rank among the models from our API price table that appear on that board.
- Coding (Code Arena): Muse Spark 1.3 #14 of 50 (41/100), Gemini 3.8 Flash #25 of 50 (15/100)
- Chat (Text Arena): Muse Spark 1.3 #6 of 51 (51/100), Gemini 3.8 Flash #5 of 51 (55/100)
- Creative writing (Text Arena creative writing): Muse Spark 1.3 #10 of 51 (27/100), Gemini 3.8 Flash #5 of 51 (54/100)
- Roleplay and characters (Text Arena multi-turn): Muse Spark 1.3 #8 of 51 (26/100), Gemini 3.8 Flash #3 of 51 (46/100)
- Reasoning and math (Text Arena math): Muse Spark 1.3 #8 of 51 (50/100), Gemini 3.8 Flash #4 of 51 (71/100)
- Vision (Vision Arena): Muse Spark 1.3 #5 of 33 (79/100), Gemini 3.8 Flash #4 of 33 (84/100)
- Long documents (Document Arena): Muse Spark 1.3 #6 of 12 (73/100), Gemini 3.8 Flash #8 of 12 (67/100)
- Cheap bulk and agents (Agent Arena): Muse Spark 1.3 #15 of 37 (40/100), Gemini 3.8 Flash #14 of 37 (40/100)
Pricing details from the official pages
Muse Spark 1.3 lists $1.25 input, $4.25 output, $0.15 cached input per 1M tokens on Meta pricing. Gemini 3.8 Flash lists $0.75 input, $3.75 output, $0.075 cached input per 1M tokens on Google pricing. Prices checked 2026-11-07.
- Muse Spark 1.3: Contributor mode (trains on your data): $0.10 in, $0.20 out.
- Gemini 3.8 Flash: Through Dec 31, 2026. From Jan 1, 2027: $1.50 in, $7.50 out.
Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $4.62 vs $3.38. Medium (20M input + 5M output tokens): $46.25 vs $33.75. Heavy (200M input + 50M output tokens): $462.50 vs $337.50.
FAQ
Is Muse Spark 1.3 cheaper than Gemini 3.8 Flash?
Muse Spark 1.3 costs $1.25 input and $4.25 output per 1M tokens; Gemini 3.8 Flash costs $0.75 and $3.75. For a medium month (20M input + 5M output tokens) Gemini 3.8 Flash is cheaper: $33.75 vs $46.25.
Which is better for coding, Muse Spark 1.3 or Gemini 3.8 Flash?
On LMArena's Code Arena Muse Spark 1.3 scores 41/100 (#14 of 50) and Gemini 3.8 Flash 15/100 (#25 of 50), so Muse Spark 1.3 is ahead by 26 points.
Which has the bigger context window?
Muse Spark 1.3: 1M tokens. Gemini 3.8 Flash: 1M tokens. Both list the same window.
How much do Muse Spark 1.3 and Gemini 3.8 Flash cost per month?
Light (2M input + 0.5M output tokens): $4.62 vs $3.38. Medium (20M input + 5M output tokens): $46.25 vs $33.75. Heavy (200M input + 50M output tokens): $462.50 vs $337.50. Pick your own token counts in the plan vs API calculator.
Where do these numbers come from?
Prices come from each provider's official pricing page, checked daily. Quality is the relative score on the LMArena leaderboard dataset, licensed CC BY 4.0. Where a model is not ranked we show n/a.
Sources
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