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DeepSeek V4.1 Flash vs Muse Spark 1.2

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Metric
DeepSeek V4.1 FlashDeepSeekdeepseek/deepseek-v4.1-flash
Muse Spark 1.2Metameta/muse-spark-1.2
Creator
DeepSeek
Meta
Released
Sep 14, 2026
Aug 22, 2025
Context window
1.05M
1.05M
Max output
944K (best)
131K
Input / 1MLowest provider price
$0.20$0.20–$0.30 across 5 (best)
$1.25
Output / 1MLowest provider price
$0.60$0.60–$1.20 across 5 (best)
$4.25
Providers
5 (best)
1
IntelligenceArtificial Analysis index
39.5
39.6 (best)
CodingArtificial Analysis index
—
72.2
Accepts
Text, Image
Text, Image, Video, Audio, Files
Produces
Text
Text
Tool calling
Yes
Yes
Structured output
No
No
Reasoning
No
Yes

DeepSeek V4.1 Flash vs Muse Spark 1.2: summary

DeepSeek V4.1 Flash and Muse Spark 1.2 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

DeepSeek V4.1 Flash, from DeepSeek, has a 1,048,576-token context window, costs from $0.20/1M input and $0.60/1M output tokens across 5 providers and scores 39.5 on the Artificial Analysis Intelligence Index.

Muse Spark 1.2, from Meta, has a 1,048,576-token context window, costs $1.25/1M input and $4.25/1M output tokens and scores 39.6 on the Artificial Analysis Intelligence Index.

DeepSeek V4.1 Flash is the cheapest on input, 6.3× cheaper than the next model and Muse Spark 1.2 scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="deepseek/deepseek-v4.1-flash", messages=[...]) # or client.chat.completions.create(model="meta/muse-spark-1.2", messages=[...])
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Benchmark scores sourced from ArtificialAnalysis