2026 Audit Report

Step-2 Pro vs Yi Lightning

Is Step-2 Pro worth the premium? Our automated audit reveals a 47% cost difference in production environments.

Last updated: Sep 23, 2026Sources: AxiomGrid Model Wiki · Provider pricing pagesQuality: HIGH

Axiom Verdict

"Yi Lightning provides a solid 46.7% arbitrage opportunity. We recommend routing L1/L2 traffic here, while keeping Step-2 Pro for complex arbitration (L3)."

Key Metrics

Axiom Snapshot
MetricStep-2 ProYi Lightning
Input / 1M¥1.08¥0.58
Output / 1M¥2.16¥1.15
Cache Read¥0.22¥0.17
Context Window1M200K
Max Output8K4K
MultimodalYesNo
LatencyTBDTBD
Best FitVisionInference

Action Plan

  • Route L1/L2 traffic to Yi Lightning and reserve Step-2 Pro for complex tasks.
  • Pilot a two-week A/B traffic split to validate latency and quality.
  • Lock a fallback plan for peak load periods.

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

MetricStep-2 ProYi Lightning
Input / 1M¥1.08¥0.58
Output / 1M¥2.16¥1.15
Cache Read¥0.22¥0.17

Use Case Analysis

Step-2 Pro Wins
  • Vision
Yi Lightning Wins
  • Inference

FAQ

Which model is cheaper: Step-2 Pro or Yi Lightning?
Yi Lightning shows a 47% cost advantage based on current input pricing.
When should I choose Step-2 Pro?
Step-2 Pro is best for Vision.
How does the context window compare?
Step-2 Pro supports 1M context vs Yi Lightning at 200K.
Which model is better for high-volume routing?
Yi Lightning 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 23, 2026.

Performance Radar

Step-2 Pro
Yi Lightning

Cost Scaling (Monthly)

Step-2 Pro vs Yi Lightning: 2026 Cost Audit | AxiomGrid