2026 Audit Report

Stable Audio 2 vs Spark 4.0

Is Stable Audio 2 worth the premium? Our automated audit reveals a 78% cost difference in production environments.

Last updated: Sep 22, 2026Sources: AxiomGrid Model Wiki · Provider pricing pagesQuality: HIGH

Axiom Verdict

"Major efficiency gain. Switching from Spark 4.0 to Stable Audio 2 cuts costs by half (78%). Recommended for high-volume batch processing."

Key Metrics

Axiom Snapshot
MetricStable Audio 2Spark 4.0
Input / 1M¥0.29¥1.30
Output / 1M¥0.00¥2.59
Cache Read-¥0.72
Context WindowN/A128K
Max OutputAudio4K
MultimodalYesNo
LatencyTBDTBD
Best FitSFXEducation

Action Plan

  • Migrate high-volume workloads to Spark 4.0 for immediate cost relief.
  • Keep Stable Audio 2 only for edge-case arbitration and premium reasoning.
  • Set a weekly cost audit to prevent pricing drift.

Methodology

  • Pricing is normalized to cost per 1M input/output tokens for direct comparison.
  • Arbitrage gap compares current input pricing against the higher-priced model.
  • Quality tier reflects pricing completeness, context window, and use-case coverage.

Pricing Matrix

MetricStable Audio 2Spark 4.0
Input / 1M¥0.29¥1.30
Output / 1M¥0.00¥2.59
Cache Read¥0.00¥0.72

Use Case Analysis

Stable Audio 2 Wins
  • SFX
Spark 4.0 Wins
  • Education

FAQ

Which model is cheaper: Stable Audio 2 or Spark 4.0?
Spark 4.0 shows a 78% cost advantage based on current input pricing.
When should I choose Stable Audio 2?
Stable Audio 2 is best for SFX.
How does the context window compare?
Stable Audio 2 supports N/A context vs Spark 4.0 at 128K.
Which model is better for high-volume routing?
Spark 4.0 is the recommended L1/L2 router for cost efficiency.
Do cache discounts materially change costs?
Yes. Cache pricing can shift effective input costs by 10-90% depending on hit rate.
How often is this comparison updated?
This audit refreshes as model pricing changes. Last updated Sep 22, 2026.

Performance Radar

Stable Audio 2
Spark 4.0

Cost Scaling (Monthly)

Stable Audio 2 vs Spark 4.0: 2026 Cost Audit | AxiomGrid