GPT-5.4 nano vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | GPT-5.4 nano | Step-3.5-Flash |
|---|---|---|
| Company | OpenAI | StepFun |
| Release Date | March 1, 2026 | February 1, 2026 |
| Parameters | — | 196B |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 66K |
| Context (output) | 128K | 8K |
| Input Price / 1M | $0.12 | $0.10 |
| Output Price / 1M | $1.50 | $0.40 |
| Average Score | 0.7 | 0.8 |
Verdict
GPT-5.4 nano leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.4 nano — 0.7, Step-3.5-Flash — 0.8.
API Cost
Step-3.5-Flash is 3.2x cheaper: input $0.10/1M vs $0.12/1M tokens.
Context Window
GPT-5.4 nano supports a larger context: 400K vs 66K tokens.
Recency
GPT-5.4 nano is newer: released 3/1/2026 vs 2/1/2026.
More About These Models
Related Comparisons
The GPT-5.4 nano 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 GPT-5.4 nano or Step-3.5-Flash page. See also the complete list of AI model comparisons.