Claude 3.5 Sonnet vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | Claude 3.5 Sonnet | Step-3.5-Flash |
|---|---|---|
| Company | Anthropic | StepFun |
| Release Date | June 21, 2024 | February 1, 2026 |
| Parameters | — | 196B |
| Multimodal | Yes | Yes |
| Context (input) | 200K | 66K |
| Context (output) | 200K | 8K |
| Input Price / 1M | $3.00 | $0.10 |
| Output Price / 1M | $15.00 | $0.40 |
| Average Score | 0.8 | 0.8 |
Verdict
Step-3.5-Flash leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude 3.5 Sonnet — 0.8, Step-3.5-Flash — 0.8.
API Cost
Step-3.5-Flash is 36.0x cheaper: input $0.10/1M vs $3.00/1M tokens.
Context Window
Claude 3.5 Sonnet supports a larger context: 200K vs 66K tokens.
Recency
Step-3.5-Flash is newer: released 2/1/2026 vs 6/21/2024.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Claude 3.5 Sonnet or Step-3.5-Flash?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude 3.5 Sonnet or Step-3.5-Flash?
Step-3.5-Flash is cheaper for input: $0.10 per 1M tokens vs $3.00.
Which has a larger context window — Claude 3.5 Sonnet or Step-3.5-Flash?
Claude 3.5 Sonnet supports a larger context: 200,000 tokens vs 65,536.
The Claude 3.5 Sonnet 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 3.5 Sonnet or Step-3.5-Flash page. See also the complete list of AI model comparisons.