Compare · ModelsLive · 2 picked · head to head
Step 3.5 Flash (free) vs GPT-4o Audio
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Step 3.5 Flash (free) wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Step 3.5 Flash (free) · GPT-4o Audio are still filling in scores.
Hype vs Reality
Attention vs performance
Step 3.5 Flash (free)
no bench·no signal
GPT-4o Audio
no bench·no signal
Vendor risk
Mixed exposure
One or more vendors flagged
StepFun
$5.0B·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.00 | $0.00 | 256K tokens (~128 books) | — | |
| $2.50 | $10.00 | 128K tokens (~64 books) | $43.75 |