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Muse Spark 1.1 vs Step 3.5 Flash

At a glance

Meta's multimodal reasoning model built for agentic work and real-world coding.

1.0M ctx$1.25/$4.25 per M

StepFun's fast and efficient language model.

262K ctx$0.10/$0.30 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-16
Reasoning & Knowledge
Expert-Level52.2%
Agentic
Terminal Tasks80.0%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper93%
Reasoning & Knowledge
Expert-Level—
Agentic
Terminal Tasks—
Specs
1.0M
Context
16K
Max output
Jul 2026
Released
262K
Context
66K
Max output
Jan 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.25/M tokens
Output$4.25/M tokens
Cache read$0.15/M tokens
Web search$0.003/search
Live pricing, shown before you run
Input92%$0.10/M tokens
Output93%$0.30/M tokens
Chat with Muse Spark 1.1Go to model
Chat with Step 3.5 FlashGo to model
Frequently Asked Questions: Muse Spark 1.1 vs Step 3.5 Flash▼

Which is better, Muse Spark 1.1 or Step 3.5 Flash?

▼

Both Muse Spark 1.1 and Step 3.5 Flash are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Muse Spark 1.1 or Step 3.5 Flash?

▼

Step 3.5 Flash has a lower blended cost. Muse Spark 1.1: $1.25 input / $4.25 output. Step 3.5 Flash: $0.10 input / $0.30 output.

Which has a larger context window, Muse Spark 1.1 or Step 3.5 Flash?

▼

Muse Spark 1.1 has a larger context window: Muse Spark 1.1 supports 1M tokens vs Step 3.5 Flash at 262K tokens.

Do both Muse Spark 1.1 and Step 3.5 Flash support vision?

▼

Muse Spark 1.1 supports vision/image input, but Step 3.5 Flash does not.

What are the key differences between Muse Spark 1.1 and Step 3.5 Flash?

▼

Key differences: Step 3.5 Flash is significantly cheaper; only Muse Spark 1.1 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Muse Spark 1.1 and Step 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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