Compare · ModelsLive · 2 picked · head to head
Step 3.5 Flash vs GPT-5.4 Pro
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Step 3.5 Flash wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Step 3.5 Flash · GPT-5.4 Pro are still filling in scores.
Hype vs Reality
Attention vs performance
Step 3.5 Flash
#9 by perf·#11 by attention
GPT-5.4 Pro
#26 by perf·no signal
Best value
Step 3.5 Flash
605.3x better value than GPT-5.4 Pro
Step 3.5 Flash
384.5 pts/$
$0.20/M
GPT-5.4 Pro
0.6 pts/$
$105.00/M
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 |
|---|---|---|---|---|
| $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 | |
| $30.00 | $180.00 | 1.1M tokens (~525 books) | $675.00 |