Gemini 3.1 Pro vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | Gemini 3.1 Pro | Step-3.5-Flash |
|---|---|---|
| Company | StepFun | |
| Release Date | February 19, 2026 | February 1, 2026 |
| Parameters | — | 196B |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 66K |
| Context (output) | 66K | 8K |
| Input Price / 1M | $2.50 | $0.10 |
| Output Price / 1M | $15.00 | $0.40 |
| Average Score | 0.8 | 0.8 |
| Benchmarks | ||
| SWE-bench Verified | 0.8 | 0.7 |
Visual Benchmark Comparison
Gemini 3.1 Pro
Step-3.5-Flash
SWE-bench Verified0.8 vs 0.7
0.8
0.7
Verdict
Gemini 3.1 Pro leads in 2 out of 5 comparison categories.
Overall Performance
Both models show comparable average scores: Gemini 3.1 Pro — 0.8, Step-3.5-Flash — 0.8.
Programming
On SWE-Bench, both models are nearly equal: Gemini 3.1 Pro — 0.8, Step-3.5-Flash — 0.7.
API Cost
Step-3.5-Flash is 35.0x cheaper: input $0.10/1M vs $2.50/1M tokens.
Context Window
Gemini 3.1 Pro supports a larger context: 1M vs 66K tokens.
Recency
Gemini 3.1 Pro is newer: released 2/19/2026 vs 2/1/2026.
More About These Models
Related Comparisons
The Gemini 3.1 Pro 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 Gemini 3.1 Pro or Step-3.5-Flash page. See also the complete list of AI model comparisons.