Kimi K2-Thinking-0905 vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | Kimi K2-Thinking-0905 | Step-3.5-Flash |
|---|---|---|
| Company | Moonshot AI | StepFun |
| Release Date | September 4, 2025 | February 1, 2026 |
| Parameters | 1.0T | 196B |
| Multimodal | No | Yes |
| Context (input) | 262K | 66K |
| Context (output) | 66K | 8K |
| Input Price / 1M | $0.60 | $0.10 |
| Output Price / 1M | $2.40 | $0.40 |
| Average Score | 0.9 | 0.8 |
| Benchmarks | ||
| AIME 2025 | 1.0 | 1.0 |
Visual Benchmark Comparison
Kimi K2-Thinking-0905
Step-3.5-Flash
AIME 20251.0 vs 1.0
1.0
1.0
Verdict
Step-3.5-Flash leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Kimi K2-Thinking-0905 — 0.9, Step-3.5-Flash — 0.8.
API Cost
Step-3.5-Flash is 6.0x cheaper: input $0.10/1M vs $0.60/1M tokens.
Context Window
Kimi K2-Thinking-0905 supports a larger context: 262K vs 66K tokens.
Recency
Step-3.5-Flash is newer: released 2/1/2026 vs 9/4/2025.
More About These Models
Related Comparisons
The Kimi K2-Thinking-0905 and Step-3.5-Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Kimi K2-Thinking-0905 or Step-3.5-Flash page. See also the complete list of AI model comparisons.