GPT-5.3-Codex vs Step 3.7 Flash
OpenAI vs StepFun — benchmarks, pricing, and capabilities side by side.
- •Step 3.7 Flash is cheaper ($0.20 vs $1.75 per 1M input)
- •GPT-5.3-Codex has a larger context window (400K)
| GPT-5.3-Codex | Step 3.7 Flash | |
|---|---|---|
| Intelligence index | 69.7 | — |
| Developer | OpenAI | StepFun |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 256,000 tokens |
| Input price | $1.75 / 1M | $0.20 / 1M |
| Output price | $14.00 / 1M | $1.15 / 1M |
| Speed | 73 tok/s | — |
| Released | February 24, 2026 | May 28, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image, Video |
| Output modalities | Text | Text |