Claude Sonnet 4.6 vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | Claude Sonnet 4.6 | Step-3.5-Flash |
|---|---|---|
| Company | Anthropic | StepFun |
| Release Date | February 17, 2026 | February 1, 2026 |
| Parameters | — | 196B |
| Multimodal | Yes | Yes |
| Context (input) | 200K | 66K |
| Context (output) | 64K | 8K |
| Input Price / 1M | $3.00 | $0.10 |
| Output Price / 1M | $15.00 | $0.40 |
| Average Score | 0.7 | 0.8 |
| Benchmarks | ||
| SWE-bench Verified | 0.8 | 0.7 |
Visual Benchmark Comparison
Claude Sonnet 4.6
Step-3.5-Flash
SWE-bench Verified0.8 vs 0.7
0.8
0.7
Verdict
Claude Sonnet 4.6 leads in 2 out of 5 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Sonnet 4.6 — 0.7, Step-3.5-Flash — 0.8.
Programming
On SWE-Bench, both models are nearly equal: Claude Sonnet 4.6 — 0.8, Step-3.5-Flash — 0.7.
API Cost
Step-3.5-Flash is 36.0x cheaper: input $0.10/1M vs $3.00/1M tokens.
Context Window
Claude Sonnet 4.6 supports a larger context: 200K vs 66K tokens.
Recency
Claude Sonnet 4.6 is newer: released 2/17/2026 vs 2/1/2026.
More About These Models
Related Comparisons
The Claude Sonnet 4.6 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 Claude Sonnet 4.6 or Step-3.5-Flash page. See also the complete list of AI model comparisons.